Every tool, plain and simple

 and  out of the input, and do not mi…</span>
        </li>
        <li>
          <a href="tool.html?card=html-entity-encoder">🔤 HTML Entity Encoder / Decoder</a>
          <span>Encode special characters to HTML entities and decode them back. Essential for web development and email templates.</span>
        </li>
        <li>
          <a href="tool.html?card=html-to-markdown-converter">📝 HTML to Markdown Converter</a>
          <span>A practical subset: headings, paragraphs, links, images, lists, bold/italic, code, blockquotes, hr. Scripts and styles are dropped. Not a…</span>
        </li>
        <li>
          <a href="tool.html?card=http-status-code-encyclopedia">📡 HTTP Status Code Encyclopedia</a>
          <span>Look up any HTTP status code, filter by class, and copy a one-line explanation. Covers the registered 1xx–5xx codes developers hit in the…</span>
        </li>
        <li>
          <a href="tool.html?card=http-status-codes">🌐 HTTP Status Code Reference</a>
          <span>Complete reference of all HTTP status codes with descriptions, causes, and solutions. Search and filter instantly.</span>
        </li>
        <li>
          <a href="tool.html?card=huffman-coding-compression">🗜️ Huffman Coding: How Compression Works</a>
          <span>Type any text and watch it get smaller: common letters get short codes, rare ones get long codes, and the result is the exact same idea b…</span>
        </li>
        <li>
          <a href="tool.html?card=iban-validator-formatter">🏦 IBAN Validator & Formatter</a>
          <span>Check an International Bank Account Number with the ISO 13616 MOD-97 algorithm, then pretty-print it in groups of four. This confirms the…</span>
        </li>
        <li>
          <a href="tool.html?card=ics-event-builder">📅 ICS Event Builder</a>
          <span>Make a .ics file any calendar app can import. Times are written as floating local (no time-zone math). All-day events use DATE values.</span>
        </li>
        <li>
          <a href="tool.html?card=ieee-754-converter">🔢 IEEE-754 Converter</a>
          <span>32-bit binary32 (float) and 64-bit binary64 (double) bit patterns via typed arrays. Paste a decimal, hex (0x…) or 32/64-bit 0/1 string.</span>
        </li>
        <li>
          <a href="tool.html?card=isbn-10-13-converter">📚 ISBN-10 ⇄ ISBN-13 Converter</a>
          <span>Validate an ISBN-10 or ISBN-13, compute the check digit, and convert between the two. Hyphens and spaces are ignored. Check digits follow…</span>
        </li>
        <li>
          <a href="tool.html?card=json-flatten-unflatten">🧩 JSON Flatten / Unflatten</a>
          <span>Nested objects become dotted keys (user.address.city); arrays use items.0. Unflatten rebuilds the tree. Runs in this page — nothing is up…</span>
        </li>
        <li>
          <a href="tool.html?card=jwt-decoder">🔐 JWT Decoder & Inspector</a>
          <span>Decode and inspect JSON Web Tokens. View header, payload, and signature. Check expiration, validate claims, and understand your tokens.</span>
        </li>
        <li>
          <a href="tool.html?card=keyboard-event-key-code-inspector">⌨️ JavaScript Keyboard Event KeyCode Inspector</a>
          <span>Live interactive JavaScript keyboard event inspector showing event.key, event.code, keyCode, which, modifiers, location, and ready-to-cop…</span>
        </li>
        <li>
          <a href="tool.html?card=keyboard-key-tester">⌨️ Keyboard Tester</a>
          <span>Click the box and press keys. Shows event.key, code and modifiers — handy when a laptop key died or a layout is fighting you. Nothing is…</span>
        </li>
        <li>
          <a href="tool.html?card=linux-bash-builder">🐚 Bash Script Builder</a>
          <span>Build bash scripts from common patterns — select blocks, customize, and copy the complete script</span>
        </li>
        <li>
          <a href="tool.html?card=linux-chmod-calculator">🔒 chmod Permission Calculator</a>
          <span>Visually set file permissions — toggle read/write/execute for owner, group, and others. Get octal, symbolic, and the full command</span>
        </li>
        <li>
          <a href="tool.html?card=linux-command-cheatsheet">🐧 Linux Command Cheat Sheet</a>
          <span>Searchable reference of 200+ Linux commands — filter by category, copy with one click</span>
        </li>
        <li>
          <a href="tool.html?card=linux-cron-builder">⏰ Cron Expression Builder</a>
          <span>Visually build cron schedules — see next 10 run times, get the crontab command, and browse common presets</span>
        </li>
        <li>
          <a href="tool.html?card=linux-disk-analyzer">💾 Disk Space Analyzer & Planner</a>
          <span>Calculate partition sizes, plan disk layouts, convert units, and get the commands to set it all up</span>
        </li>
        <li>
          <a href="tool.html?card=linux-log-analyzer">📋 Log Analyzer & Command Generator</a>
          <span>Paste log output to get instant analysis, or generate commands to search, filter, and monitor logs</span>
        </li>
        <li>
          <a href="tool.html?card=linux-regex-tester">🔍 Regex Tester & Builder</a>
          <span>Test regular expressions live — see matches highlighted, capture groups extracted, and get the grep/sed/awk command</span>
        </li>
        <li>
          <a href="tool.html?card=linux-signal-reference">📡 Linux Process & Signal Reference</a>
          <span>Complete reference of Linux signals, process states, and process management commands with examples</span>
        </li>
        <li>
          <a href="tool.html?card=linux-ssh-generator">🔑 SSH Command Generator</a>
          <span>Build SSH, SCP, and SSH tunnel commands — fill in the options, copy the command</span>
        </li>
        <li>
          <a href="tool.html?card=linux-systemd-generator">⚙️ Systemd Service Generator</a>
          <span>Generate systemd .service unit files — fill in the details, get a complete service file with install instructions</span>
        </li>
        <li>
          <a href="tool.html?card=luhn-check-digit-validator">🔢 Luhn Check Digit Validator</a>
          <span>Validate or generate a Luhn (mod 10) check digit. Used by card numbers, IMEI, NPI and some barcodes. This only tests the checksum — it ca…</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-table-ascii-generator">📊 Markdown & ASCII Table Generator</a>
          <span>Interactive spreadsheet grid editor to create, format, and convert tables to GitHub-flavored Markdown, ASCII box art, Unicode borders, HT…</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-table-generator">▦ Markdown Table Generator</a>
          <span>Paste CSV or TSV (header in row 1). Pipes in cells are escaped. Alignment is applied to every column. Copy into GitHub, Reddit or a README.</span>
        </li>
        <li>
          <a href="tool.html?card=mime-type-lookup-table">📎 MIME Type Lookup</a>
          <span>Convert a file extension to a MIME type, or a MIME type back to common extensions. Handy when writing Content-Type headers, nginx maps or…</span>
        </li>
        <li>
          <a href="tool.html?card=nanoid-generator">🪪 Nano ID Generator</a>
          <span>URL-safe IDs from crypto.getRandomValues. Default alphabet is A–Za–z0–9_- (64 symbols). Collision odds are about (n²) / (2 × 64^size) for…</span>
        </li>
        <li>
          <a href="tool.html?card=neural-network-playground">🧠 Neural Network Playground</a>
          <span>Watch a tiny neural network learn XOR — the task that killed the first wave of neural networks, because a straight line can't separate th…</span>
        </li>
        <li>
          <a href="tool.html?card=nginx-redirect-generator">🔀 Nginx Redirect Generator</a>
          <span>Build return / rewrite snippets for 301/302, HTTP→HTTPS and www/apex. Paste into a server { } block. A looping redirect takes a site down…</span>
        </li>
        <li>
          <a href="tool.html?card=number-base-converter">🔢 Number Base Converter</a>
          <span>Convert numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36. Live conversion as you type.</span>
        </li>
        <li>
          <a href="tool.html?card=password-strength-entropy-checker">🛡️ Password Strength & Crack-Time Estimator</a>
          <span>Type a password to see its entropy in bits, estimated time to crack at online, offline and GPU-cluster speeds, and specific weaknesses —…</span>
        </li>
        <li>
          <a href="tool.html?card=pathfinding-algorithm-visualizer">🗺️ Pathfinding Algorithm Visualizer</a>
          <span>Draw walls and watch four search algorithms hunt for the goal: DFS wanders, BFS floods evenly, Dijkstra matches BFS on a uniform grid, an…</span>
        </li>
        <li>
          <a href="tool.html?card=px-rem-em-unit-converter">↔️ px ⇄ rem ⇄ em Converter</a>
          <span>Convert CSS lengths between pixels, rem and em for a chosen root and parent font size. Defaults to the browser 16 px root. Copy-ready dec…</span>
        </li>
        <li>
          <a href="tool.html?card=query-string-parser">🔗 Query String Parser</a>
          <span>Split a URL or a raw ?a=1&b=2 into keys. Duplicate keys become arrays. Build the other way from JSON. Uses the platform URLSearchParams —…</span>
        </li>
        <li>
          <a href="tool.html?card=recursion-memoization-explorer">🌳 Recursion & Memoization Explorer</a>
          <span>The same Fibonacci function, two ways: naive recursion recomputes the same subproblems a staggering number of times, while memoization re…</span>
        </li>
        <li>
          <a href="tool.html?card=regex-cheat-sheet">🔍 Regex Cheat Sheet & Tester</a>
          <span>Complete regex reference with live testing. Pattern syntax, flags, character classes, quantifiers, and groups — all in one place.</span>
        </li>
        <li>
          <a href="tool.html?card=semver-compare-bump-calculator">📦 SemVer Compare & Bump</a>
          <span>Compare two Semantic Versioning 2.0.0 strings, then bump major, minor, patch or a pre-release. Precedence follows the spec: major.minor.p…</span>
        </li>
        <li>
          <a href="tool.html?card=slug-generator">🔗 Slug Generator</a>
          <span>Convert any text into URL-friendly slugs. Perfect for blog posts, filenames, and SEO-friendly URLs.</span>
        </li>
        <li>
          <a href="tool.html?card=sorting-algorithm-visualizer">📊 Sorting Algorithm Visualizer</a>
          <span>Watch six classic sorting algorithms race on the same shuffled data — see exactly why O(n²) sorts crawl while merge and quick sort f…</span>
        </li>
        <li>
          <a href="tool.html?card=srt-subtitle-time-shifter">🎬 SRT Subtitle Time Shifter</a>
          <span>Shift every HH:MM:SS,mmm timestamp in an .srt by milliseconds (negative to go earlier). Runs in this page — files stay on your device.</span>
        </li>
        <li>
          <a href="tool.html?card=svg-path-optimizer-cleaner">⚡ SVG Path Optimizer & Minifier</a>
          <span>Minify and clean SVG markup, remove metadata, editor bloat and unused namespaces, round decimal precision, preview live, and copy optimiz…</span>
        </li>
        <li>
          <a href="tool.html?card=text-binary-converter">🔢 Text ↔ Binary Converter</a>
          <span>Convert text to binary and back. Supports ASCII, UTF-8, and custom bit lengths. Perfect for learning computer science.</span>
        </li>
        <li>
          <a href="tool.html?card=text-case-converter-toolkit">🔠 Text Case Converter Toolkit</a>
          <span>Instantly convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_C…</span>
        </li>
        <li>
          <a href="tool.html?card=text-case-converter">🔡 Text Case Converter</a>
          <span>Paste anything and get it back in every case at once: UPPER, lower, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-c…</span>
        </li>
        <li>
          <a href="tool.html?card=text-diff-compare-checker">🔍 Text Diff & Compare Checker</a>
          <span>Paste two versions of any text and see exactly what changed — line by line or word by word — with additions and deletions highlighted. Ru…</span>
        </li>
        <li>
          <a href="tool.html?card=text-diff-viewer">📝 Text Diff Viewer</a>
          <span>Compare two texts side by side and see exactly what changed. Added, removed, and modified lines highlighted.</span>
        </li>
        <li>
          <a href="tool.html?card=towers-of-hanoi">🗼 Towers of Hanoi</a>
          <span>Move the stack from peg A to peg C, never putting a bigger disk on a smaller one. The catch: the optimal solution is 2ⁿ − 1 moves…</span>
        </li>
        <li>
          <a href="tool.html?card=truth-table-generator">🧮 Truth Table Generator</a>
          <span>Generate truth tables for logical expressions. Supports AND, OR, NOT, XOR, IMPLIES, and IFF operators.</span>
        </li>
        <li>
          <a href="tool.html?card=unicode-converter">🌐 Unicode Converter</a>
          <span>Convert text to Unicode code points, HTML entities, and escape sequences. Supports all Unicode characters.</span>
        </li>
        <li>
          <a href="tool.html?card=unix-timestamp-converter">⏱️ Unix Timestamp Converter</a>
          <span>Convert between Unix timestamps and human-readable dates. Live clock, batch conversion, and multiple formats.</span>
        </li>
        <li>
          <a href="tool.html?card=url-encoder-decoder-parser">🔗 URL Encoder, Decoder & Parser</a>
          <span>Percent-encode or decode any text (full encodeURIComponent or URL-safe encodeURI), and break a URL into protocol, host, port, path, hash…</span>
        </li>
        <li>
          <a href="tool.html?card=url-encoder-decoder">🔗 URL Encoder / Decoder</a>
          <span>Encode text to URL-safe format or decode URL-encoded strings. Handles special characters, Unicode, and query parameters.</span>
        </li>
        <li>
          <a href="tool.html?card=user-agent-browser-fingerprint-analyzer">🕵️ User Agent & Browser Client Inspector</a>
          <span>Inspect your browser's user agent string, client hints, screen geometry, GPU WebGL renderer, touch capabilities, color depth, and network…</span>
        </li>
        <li>
          <a href="tool.html?card=uuid-generator">🆔 UUID Generator</a>
          <span>Generate universally unique identifiers (UUIDs) v4 and v1. Bulk generate, copy, and download.</span>
        </li>
        <li>
          <a href="tool.html?card=uuid-guid-bulk-generator">🆔 UUID / GUID & Random ID Bulk Generator</a>
          <span>Generate one or hundreds of UUID v4s, time-ordered UUID v7s, ULIDs, NanoIDs, short IDs or custom-pattern codes using the browser's crypto…</span>
        </li>
        <li>
          <a href="tool.html?card=uuid-random-id-generator">🆔 UUID & Random ID Generator</a>
          <span>Generate cryptographically random UUID v4, time-ordered UUID v7, ULID, NanoID, short IDs and custom-alphabet tokens in bulk. Uses your br…</span>
        </li>
        <li>
          <a href="tool.html?card=vcard-contact-generator">🪪 vCard Generator</a>
          <span>Build a vCard 3.0 you can save as .vcf and open on a phone. Stays in the browser — no address book is uploaded.</span>
        </li>
        <li>
          <a href="tool.html?card=video-bitrate-file-size-calculator">🎬 Video Bitrate File Size</a>
          <span>Estimate video file size from duration and video/audio bitrates, or solve for the bitrate that fits a size budget. Formula: size ≈ (video…</span>
        </li>
        <li>
          <a href="tool.html?card=wifi-speed-bandwidth-calculator">📶 WiFi Speed & Download Time Calculator</a>
          <span>Calculate exact file download and upload durations, test bandwidth capacity for simultaneous 4K streams and video calls, and estimate mob…</span>
        </li>
        <li>
          <a href="tool.html?card=xml-beautifier-formatter">🌳 XML Beautifier</a>
          <span>Pretty-print or minify XML in the browser. No schema validation, no network. Attributes and comments are preserved as text — this is an i…</span>
        </li>
        <li>
          <a href="tool.html?card=xml-formatter">📐 XML Formatter & Validator</a>
          <span>Format, minify, validate, and explore XML. Paste messy XML, get clean indented output with syntax highlighting.</span>
        </li>
        <li>
          <a href="tool.html?card=yaml-converter">📋 YAML ↔ JSON Converter</a>
          <span>Convert between YAML and JSON instantly. Paste, convert, copy. Supports nested structures, arrays, and multi-line strings.</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="saas-and-business-killers">
      <h2>💼 SaaS & Business Killers <span class="count">44 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=ab-test-significance-calculator">🧪 Split Test Lab</a>
          <span>The two numbers every experiment platform charges you to see: is this difference real, and how long must the test run? Frequentist z-test…</span>
        </li>
        <li>
          <a href="tool.html?card=b2b-cold-email-sequence-generator">✉️ B2B Cold Email Generator</a>
          <span>Generate high-converting 4-touch B2B cold email sequences. Features real-time spam keyword detection and an inbox deliverability health s…</span>
        </li>
        <li>
          <a href="tool.html?card=brand-logo-mark-generator">✒️ Brand Mark Forge</a>
          <span>Design a real logo in the browser and leave with the vector file. Twenty-two hand-drawn icons, five type treatments, four container shape…</span>
        </li>
        <li>
          <a href="tool.html?card=business-model-canvas-builder">🧩 Business Model Canvas</a>
          <span>The one-page strategy board that consultants charge a day rate to facilitate. Fill the nine blocks of a Business Model Canvas or a Lean C…</span>
        </li>
        <li>
          <a href="tool.html?card=css-animation-generator">✨ CSS Animation Generator</a>
          <span>Preview common CSS keyframe animations, tune duration, delay and easing, then copy a small standalone animation block. The preview honour…</span>
        </li>
        <li>
          <a href="tool.html?card=css-border-radius-generator">🔘 CSS Border Radius Generator</a>
          <span>Shape a card, button or image frame with four independent corner radii, preview the result and copy the compact CSS shorthand. Switch bet…</span>
        </li>
        <li>
          <a href="tool.html?card=css-box-shadow-generator">🌑 CSS Box Shadow Generator</a>
          <span>Tune a CSS box-shadow visually, choose a colour and opacity, test inset mode and copy production-ready CSS. The preview updates as you mo…</span>
        </li>
        <li>
          <a href="tool.html?card=css-filter-generator">🎛️ CSS Filter Generator</a>
          <span>Combine brightness, contrast, saturation, hue, blur and monochrome effects with a live visual preview, then copy one filter declaration…</span>
        </li>
        <li>
          <a href="tool.html?card=css-flexbox-playground">↔️ CSS Flexbox Playground</a>
          <span>Explore real flexbox controls side by side: direction, wrapping, gap and alignment update the preview immediately, then a copyable CSS bl…</span>
        </li>
        <li>
          <a href="tool.html?card=css-grid-layout-generator">🔲 CSS Grid Layout Generator</a>
          <span>Build a responsive CSS Grid visually: set tracks, gap, flow and item alignment, optionally make one card span multiple cells, then copy t…</span>
        </li>
        <li>
          <a href="tool.html?card=csv-data-studio">📊 CSV Data Studio</a>
          <span>Paste a spreadsheet, get a clean dataset. Parses CSV/TSV, detects the delimiter, profiles every column, cleans the rows, and re-exports a…</span>
        </li>
        <li>
          <a href="tool.html?card=curl-command-builder">🖥️ cURL Command Builder</a>
          <span>Assemble a safe-to-copy cURL command from a URL, method, headers and optional request body. It quotes shell values correctly and never se…</span>
        </li>
        <li>
          <a href="tool.html?card=email-signature-generator">📧 Signature Forge</a>
          <span>Build an email signature that survives Gmail, Outlook and Apple Mail, then copy it with formatting intact and paste straight into your ma…</span>
        </li>
        <li>
          <a href="tool.html?card=email-subject-line-tester">✉️ Email Subject Line Tester</a>
          <span>Preview how a subject line and preheader may truncate on mobile or desktop, check length and punctuation, and get practical editing promp…</span>
        </li>
        <li>
          <a href="tool.html?card=favicon-svg-icon-generator">🪄 Favicon & SVG Icon Generator</a>
          <span>Make a sharp, lightweight vector favicon from initials or one emoji, tune its colours and shape, then download a ready-to-use SVG. It als…</span>
        </li>
        <li>
          <a href="tool.html?card=gdpr-ccpa-privacy-policy-generator">🛡️ Privacy Policy Generator</a>
          <span>Generate legally-compliant Privacy Policies for websites, mobile apps, SaaS, and e-commerce stores. Includes GDPR, CCPA/CPRA, cookie cons…</span>
        </li>
        <li>
          <a href="tool.html?card=html-entity-encoder-decoder">🔤 HTML Entity Encoder & Decoder</a>
          <span>Escape text for safe HTML display, decode named or numeric entities, and inspect the characters in a string. Choose readable entities for…</span>
        </li>
        <li>
          <a href="tool.html?card=html-table-generator">📋 HTML Table Generator</a>
          <span>Turn a quick list of headers and rows into accessible, escaped HTML table markup with a live preview. Paste pipe- or comma-separated data…</span>
        </li>
        <li>
          <a href="tool.html?card=image-optimiser-studio">🗜️ Image Optimiser Studio</a>
          <span>Batch-shrink photos and screenshots without uploading a single byte. Drop files in, pick a target size and format, and watch the real com…</span>
        </li>
        <li>
          <a href="tool.html?card=inventory-reorder-point-planner">📦 Inventory Reorder Point Planner</a>
          <span>Calculate when to reorder stock using sales velocity, supplier lead time and safety stock. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=invoice-billing-pdf-generator">🧾 InvoiceForge Generator</a>
          <span>Generate clean, client-ready invoices with zero watermarks. Calculates multi-currency line items, tax, discounts, and payment terms with…</span>
        </li>
        <li>
          <a href="tool.html?card=json-ld-structured-data-generator">🏷️ Rich Result Forge</a>
          <span>Build valid schema.org JSON-LD for the rich results Google actually shows — products with price and availability, FAQs, breadcrumbs, even…</span>
        </li>
        <li>
          <a href="tool.html?card=json-to-typescript-interface-generator">🧬 JSON Schema Forge</a>
          <span>Paste any JSON response and get production-ready types in six dialects at once: TypeScript interfaces, a Zod schema, Python dataclasses…</span>
        </li>
        <li>
          <a href="tool.html?card=lorem-ipsum-placeholder-generator">📝 Lorem Ipsum & Placeholder Generator</a>
          <span>Generate clean dummy copy for wireframes, CMS previews, slide decks and prototypes. Pick classic lorem ipsum or readable English-style fi…</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-slide-deck-builder">🎞️ Deck Forge</a>
          <span>Write a presentation as plain text and present it from the browser. Split slides with ---, get a live thumbnail rail, speaker notes, a ru…</span>
        </li>
        <li>
          <a href="tool.html?card=meeting-cost-live-ticker">💸 Meeting Cost Ticker</a>
          <span>Track real-time company salary burn during meetings. Keep discussions focused, respect employee time, and visualize the true cost of ever…</span>
        </li>
        <li>
          <a href="tool.html?card=mock-data-generator">🧪 Mock Data Generator</a>
          <span>Create repeatable sample customer, product or analytics-event datasets as JSON, CSV or SQL inserts. Names and example.test emails are del…</span>
        </li>
        <li>
          <a href="tool.html?card=nda-contract-service-agreement-builder">⚖️ Contract & NDA Builder</a>
          <span>Generate legally-binding Non-Disclosure Agreements (NDA) and Independent Contractor Service Agreements. Customize IP assignment, confiden…</span>
        </li>
        <li>
          <a href="tool.html?card=retainer-capacity-planner">⏱️ Retainer Capacity Planner</a>
          <span>Check whether monthly client retainers fit your available hours and reveal effective revenue per hour. All calculations stay in your brow…</span>
        </li>
        <li>
          <a href="tool.html?card=robots-sitemap-generator">🗺️ Robots.txt & Sitemap Generator</a>
          <span>Draft a valid robots.txt and XML sitemap from your own URL list. Add paths or full URLs, set crawl rules and download the result. This is…</span>
        </li>
        <li>
          <a href="tool.html?card=saas-churn-revenue-impact">📉 SaaS Churn Revenue Impact</a>
          <span>Model recurring revenue lost to churn and the customers needed to maintain or grow monthly revenue. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=saas-metrics-ltv-cac-calculator">📈 SaaS LTV & CAC Calculator</a>
          <span>Calculate core SaaS unit economics, Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), payback period, and cash burn runway…</span>
        </li>
        <li>
          <a href="tool.html?card=seo-meta-tag-social-previewer">🔍 SEO Meta Tag Previewer</a>
          <span>Generate and preview Open Graph, Twitter Cards, and SEO meta tags in real time. Simulate Google SERP snippets and social media feed cards…</span>
        </li>
        <li>
          <a href="tool.html?card=social-media-image-resizer-cropper">🎨 Social Image Resizer</a>
          <span>Crop and export pixel-perfect images for every social media network directly in your browser. 100% client-side HTML5 Canvas with zero ser…</span>
        </li>
        <li>
          <a href="tool.html?card=social-proof-testimonial-card-generator">🌟 Testimonial Card Generator</a>
          <span>Turn customer reviews, tweets, and testimonials into high-converting social proof cards. Generates pure zero-dependency HTML & CSS code w…</span>
        </li>
        <li>
          <a href="tool.html?card=sql-formatter-query-helper">🗃️ SQL Formatter & Query Helper</a>
          <span>Make a dense SQL query readable without sending it to a database. This formatter understands common SELECT, INSERT, UPDATE and DELETE cla…</span>
        </li>
        <li>
          <a href="tool.html?card=startup-cap-table-dilution-simulator">📊 Cap Table & Dilution</a>
          <span>Model startup equity dilution across funding rounds. Calculates Y Combinator post-money SAFEs, valuation caps, employee option pool (ESOP…</span>
        </li>
        <li>
          <a href="tool.html?card=startup-runway-burn-rate-simulator">🛫 Runway & Burn Simulator</a>
          <span>The question that ends startups: which month does the bank account hit zero? Enter your cash, your costs and your revenue growth, and it…</span>
        </li>
        <li>
          <a href="tool.html?card=text-case-slug-converter">🔠 Text Case & Slug Converter</a>
          <span>Convert a headline, phrase or identifier into title case, sentence case, camelCase, snake_case, kebab-case and a URL-friendly slug at onc…</span>
        </li>
        <li>
          <a href="tool.html?card=text-diff-checker">🔎 Text Diff Checker</a>
          <span>Compare two versions of text and see additions, removals and unchanged passages in a clean unified diff. Choose line-by-line for document…</span>
        </li>
        <li>
          <a href="tool.html?card=unix-timestamp-date-converter">🕰️ Unix Timestamp Converter</a>
          <span>Convert Unix seconds or milliseconds into local time, UTC and ISO 8601 — or turn a date and time back into a timestamp. The conversion us…</span>
        </li>
        <li>
          <a href="tool.html?card=url-encoder-query-builder">🔗 URL Encoder & Query Builder</a>
          <span>Encode or decode URL text safely, then inspect, edit and rebuild query parameters without losing special characters. It is useful for sha…</span>
        </li>
        <li>
          <a href="tool.html?card=utm-campaign-matrix-builder">🔗 UTM Campaign URL Builder</a>
          <span>Generate standardized Google Analytics 4 (GA4) tracking URLs across multiple marketing channels simultaneously. Enforces lowercase slugif…</span>
        </li>
        <li>
          <a href="tool.html?card=uuid-ulid-generator">🆔 UUID & ULID Generator</a>
          <span>Generate UUID v4, time-sortable UUID v7 or ULIDs in batches, then copy or download the results. Random bits come from your browser's cryp…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="survival-and-emergency-readiness">
      <h2>🆘 Survival & Emergency Readiness <span class="count">10 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=cold-water-ice-drowning-rescue">🌊 Cold Water, Ice & Drowning Rescue</a>
          <span>Cold water kills strong swimmers in minutes, and it kills them long before hypothermia is even possible. Most people who die in UK waters…</span>
        </li>
        <li>
          <a href="tool.html?card=driving-emergency-survival-guide">🚗 Driving Emergency Survival Guide</a>
          <span>Almost every driving emergency has one instinctive response that makes it worse and one trained response that fixes it. Pick the situatio…</span>
        </li>
        <li>
          <a href="tool.html?card=emergency-comms-radio-planner">📡 Emergency Communications & Radio Planner</a>
          <span>In every major incident the mobile network is the first thing to fail — not from damage, but from everybody calling at once. This works o…</span>
        </li>
        <li>
          <a href="tool.html?card=evacuation-go-bag-planner">🎒 Evacuation & Go-Bag Planner</a>
          <span>Three different emergencies need three different bags, and most people prepare the wrong one. Build all three here, weigh them against wh…</span>
        </li>
        <li>
          <a href="tool.html?card=fire-escape-smoke-safety-planner">🔥 Fire Escape & Smoke Safety Planner</a>
          <span>Most fire deaths are not from flames — they are from smoke, at night, in homes where nobody had ever worked out a route. Answer twenty qu…</span>
        </li>
        <li>
          <a href="tool.html?card=gas-leak-carbon-monoxide-response">🫁 Gas Leak & Carbon Monoxide Response</a>
          <span>Three things people get wrong in the first two minutes, and all three can be fatal: what to touch when you smell gas, how to recognise ca…</span>
        </li>
        <li>
          <a href="tool.html?card=heat-cold-exposure-survival-calc">🥶 Heat & Cold Exposure Calculator</a>
          <span>Temperature alone lies. Wind takes heat off you far faster than the number suggests, humidity stops you cooling yourself down, and wet cl…</span>
        </li>
        <li>
          <a href="tool.html?card=personal-safety-awareness-planner">🛡 Personal Safety & Awareness Planner</a>
          <span>Most personal-safety advice is about what to do when something is already going wrong. The useful part is earlier: noticing a situation w…</span>
        </li>
        <li>
          <a href="tool.html?card=poison-chemical-exposure-response">☣️ Poison & Chemical Exposure Response</a>
          <span>The first ninety seconds after a poisoning are mostly about not making it worse, and most of the folk advice is actively dangerous. Find…</span>
        </li>
        <li>
          <a href="tool.html?card=water-purification-treatment-calculator">💧 Water Purification Planner</a>
          <span>You can live weeks without food and about three days without water. This works out how much to store, how many containers that is, and —…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="aquatics-and-fishkeeping">
      <h2>🌊 Aquatics & Fishkeeping <span class="count">10 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=aquarium-co2-drop-checker-calculator">🫧 Aquarium CO₂ Calculator</a>
          <span>Dial in high-tech planted tank CO₂ injection. Calculate dissolved CO₂ concentration (ppm) from pH/KH equilibrium, simulate 4 dKH drop che…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-feeding-vacation-planner">🍤 Fish Feeding & Vacation Planner</a>
          <span>Generate weekly nutrition schedules with gut-clearing fast days. Calculate safe vacation fasting limits, prevent the catastrophic "neighb…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-heater-chiller-calculator">🌡️ Aquarium Heater & Chiller</a>
          <span>Calculate precision heating wattage, evaporative surface loss, and cooling chiller ratings. Eliminates the catastrophic "stuck heater" di…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-lighting-par-calculator">💡 Aquarium PAR Lighting</a>
          <span>Calculate photosynthetically active radiation (PAR) penetration at substrate depth, daily light integral (DLI), and generate split photop…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-medication-dosing-calculator">💊 Fish Medication Dosing</a>
          <span>Identify fish ailments by symptom and calculate precision medication dosages based on true net water volume. Includes invertebrate toxici…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-nitrogen-cycle-tracker">🔄 Nitrogen Cycle Tracker</a>
          <span>Master the nitrogen cycle without harming livestock. Calculate exact pure ammonia dosing, simulate bacterial colonisation curves (Nitroso…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-stocking-compatibility-calculator">🐠 Fish Stocking Compatibility</a>
          <span>Build your community aquarium roster. Calculates true metabolic bioload, swimming strata distribution (top, mid, bottom), temperature and…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-substrate-hardscape-calculator">🪨 Aquarium Substrate Estimator</a>
          <span>Plan your planted tank and hardscape layout. Calculate exact substrate volume, sloped perspective depth, commercial bag counts (3L/9L aqu…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-volume-weight-calculator">🌊 Aquarium Volume & Weight</a>
          <span>Calculate gross and true net water volume, accounting for glass thickness, top water margin, substrate, and hardscape displacement. Compu…</span>
        </li>
        <li>
          <a href="tool.html?card=aquarium-water-change-salinity-calculator">🧪 Water Change & Salinity</a>
          <span>Precision aquatic water chemistry toolkit. Calculate exact nitrate dilution percentages, RO/DI remineralization buffers for dwarf shrimp…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="anime-and-otaku-culture">
      <h2>🎌 Anime & Otaku Culture <span class="count">10 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=anime-binge-watch-calculator">⏱️ Anime Binge Calculator</a>
          <span>Calculate the exact time required to binge any anime series. Account for OP/ED skipping, filler elimination, playback speeds ($1.0\times…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-character-archetype-matrix">👑 Anime Character Archetypes</a>
          <span>Explore the psychological Dere spectrum of anime character archetypes. Inspect behavioral triggers, iconic representatives, and take the…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-convention-budget-planner">🎪 Anime Con Budget Planner</a>
          <span>Plan your anime convention expedition (Anime Expo, Otakon, Anime NYC, MCM). Split hotel costs across roommates, budget Artist Alley print…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-cosplay-prop-scaler">🗡️ Cosplay Prop Scaler</a>
          <span>Scale anime weapons and props proportionally to your exact real-world body height. Calculate blade length, hilt dimensions, EVA foam shee…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-filler-canon-guide">📜 Anime Filler Guide</a>
          <span>Distinguish manga canon, anime canon, and skippable studio filler arcs across major long-running anime. Search any episode number or gene…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-japanese-phrases-tropes">🎌 Anime Phrases & Tropes</a>
          <span>Decode iconic anime verbal tics (*dattebayo*, *de gozaru*, *nya*), battle cries (*omae wa mou shindeiru*), and dialogue tropes with nativ…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-oped-music-analyzer">🎵 Anime Music BPM Analyzer</a>
          <span>Analyze the rhythmic energy of iconic Anime Openings and Endings. Explore the legendary Japanese TV 89-second broadcast rule, tap along w…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-recommendation-mood-engine">🔮 Anime Mood Matcher</a>
          <span>Find the perfect anime tailored to your exact emotional state and available time. Filter by desired mood (cathartic tears, adrenaline hyp…</span>
        </li>
        <li>
          <a href="tool.html?card=anime-release-schedule-converter">🕒 Anime Schedule Converter</a>
          <span>Convert Tokyo Japan Standard Time (JST / UTC+9) anime broadcasts to your local timezone. Decodes Japanese TV late-night 30-hour clock con…</span>
        </li>
        <li>
          <a href="tool.html?card=manga-to-anime-chapter-converter">📖 Manga to Anime Finder</a>
          <span>Finished an anime season and want to continue the story? Find the exact manga chapter and volume where the anime left off, along with cha…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="finance-and-money">
      <h2>💰 Finance & Money <span class="count">90 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=apr-apy-converter">🏦 APR ⇄ APY Converter</a>
          <span>APY = (1 + APR/n)n − 1, where n is compounds per year. APR is the quoted nominal rate; APY (EAR in the UK) is what you actually earn or p…</span>
        </li>
        <li>
          <a href="tool.html?card=bank-complaint-tracker">📅 Bank Complaint Deadline Tracker</a>
          <span>Track your complaint deadlines — never miss a bank's response window, FOS deadline, or court limitation period</span>
        </li>
        <li>
          <a href="tool.html?card=bank-credit-score-dispute">📊 Credit Score Dispute Letter Generator</a>
          <span>Challenge incorrect entries on your credit report — generate dispute letters for credit agencies and banks</span>
        </li>
        <li>
          <a href="tool.html?card=bank-dispute-letter">✉️ Bank Charge Dispute Letter Generator</a>
          <span>Generate formal dispute letters for unauthorized charges, unfair fees, and billing errors — ready to send to your bank</span>
        </li>
        <li>
          <a href="tool.html?card=bank-fee-calculator">💰 Hidden Bank Fee Calculator</a>
          <span>Calculate the TRUE cost of your bank account — overdraft fees, ATM charges, FX markups, and hidden costs that banks hope you won't notice</span>
        </li>
        <li>
          <a href="tool.html?card=bank-fos-complaint">⚖️ Financial Ombudsman Complaint Builder</a>
          <span>Build a complete FOS complaint — step by step. Get your money back when the bank refuses to help</span>
        </li>
        <li>
          <a href="tool.html?card=bank-interest-reclaim">📊 Overdraft & Interest Reclaim Calculator</a>
          <span>Calculate how much you've been overcharged on overdraft interest and fees — then generate a reclaim letter</span>
        </li>
        <li>
          <a href="tool.html?card=bank-sar-request">🔍 Subject Access Request (SAR) Generator</a>
          <span>Force your bank to reveal ALL data they hold on you — internal notes, decision records, credit scoring, and communications</span>
        </li>
        <li>
          <a href="tool.html?card=bank-section75-claim">🛡️ Section 75 Claim Calculator & Letter</a>
          <span>Check if your credit card purchase is protected under Section 75 — calculate your claim and generate the letter</span>
        </li>
        <li>
          <a href="tool.html?card=bank-small-claims">⚖️ Small Claims Court Guide & Cost Calculator</a>
          <span>Calculate court costs, check eligibility, and generate your claim — the nuclear option when banks refuse to play fair</span>
        </li>
        <li>
          <a href="tool.html?card=bank-switching-calculator">🔄 Bank Switching Bonus Calculator</a>
          <span>Compare bank switching bonuses, calculate total savings, and see how much your loyalty is costing you</span>
        </li>
        <li>
          <a href="tool.html?card=break-even">Break‑Even Calculator</a>
          <span>Quick Examples:</span>
        </li>
        <li>
          <a href="tool.html?card=budget">💰 Financial Budget Dashboard</a>
          <span>Smart budgeting with predictive analytics, financial health scoring, and personalized optimization strategies.</span>
        </li>
        <li>
          <a href="tool.html?card=business-days-working-days-calculator">📅 Business Days Calculator</a>
          <span>Count weekdays between two dates, or add N working days to a start date. Weekends are skipped; paste extra holidays if you need them. All…</span>
        </li>
        <li>
          <a href="tool.html?card=cagr-annual-growth-calculator">📈 CAGR — Compound Annual Growth</a>
          <span>CAGR = (end ÷ start)1/years − 1. The smoothed yearly rate that takes a starting value to an ending value. It ignores deposits, fees and t…</span>
        </li>
        <li>
          <a href="tool.html?card=car-ownership-cost-calculator">🚗 Car Ownership Cost Calculator (UK)</a>
          <span>Work out the true cost of running a car in the UK — depreciation, fuel or electricity, insurance, VED road tax, servicing, MOT, tyres and…</span>
        </li>
        <li>
          <a href="tool.html?card=cash-runway-planner">🏃 Cash Runway Planner</a>
          <span>Forecast how long business cash will last and the revenue or cost change needed to reach a target runway. All calculations stay in your b…</span>
        </li>
        <li>
          <a href="tool.html?card=compoundinterest">💰 Compound Interest Calculator</a>
          <span>Calculate future value, growth projections, and compare investment scenarios. Visualize wealth accumulation over time with detailed break…</span>
        </li>
        <li>
          <a href="tool.html?card=creditcard">💳 Credit Card Calculator</a>
          <span>Calculate how long it will take to pay off your credit card and save money with different payoff strategies.</span>
        </li>
        <li>
          <a href="tool.html?card=currency">💱 Currency Converter</a>
          <span>Convert between 150+ currencies with live exchange rates. Using ExchangeRate-API with fallback to local data[citation:5][citation:8].</span>
        </li>
        <li>
          <a href="tool.html?card=datecalc">📅 Date Calculator</a>
          <span>Calculate date differences, add/subtract days, and discover interesting date facts instantly.</span>
        </li>
        <li>
          <a href="tool.html?card=debtpayoff">💰 Debt Payoff Calculator</a>
          <span>Calculate how long it will take to become debt-free and save money with different payoff strategies.</span>
        </li>
        <li>
          <a href="tool.html?card=differential-equations">🧮 AI Differential Equations Solver</a>
          <span>WORLD'S FIRST interactive DE solver with step-by-step explanations, visual graphs, and real-world applications. Used by universities worl…</span>
        </li>
        <li>
          <a href="tool.html?card=discount">Discount Calculator</a>
          <span>Calculate final prices after discounts and taxes. Compare multiple deals and save your calculations.</span>
        </li>
        <li>
          <a href="tool.html?card=dividend-yield-calculator">📈 Dividend Yield Calculator</a>
          <span>Trailing yield = annual dividends per share ÷ price. Forward yield uses the next expected year. Cover = EPS ÷ DPS. This is a ratio, not i…</span>
        </li>
        <li>
          <a href="tool.html?card=employee-true-cost-calculator">👥 Employee True Cost Calculator</a>
          <span>Estimate the fully loaded annual and monthly cost of hiring beyond the headline salary. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=energy-tariff-comparator">⚡ Energy Tariff Comparator</a>
          <span>Suppliers advertise the unit rate because it is the flattering number, but the standing charge is paid every single day whether you use a…</span>
        </li>
        <li>
          <a href="tool.html?card=ev-charging-cost-calculator">🔌 EV Charging Cost & Time</a>
          <span>Estimate kWh, cost and wall-clock time to charge an electric car. Uses usable battery size, start/end state of charge, charger kW and uni…</span>
        </li>
        <li>
          <a href="tool.html?card=fire-financial-independence-calc">🔥 FIRE Retirement Planner</a>
          <span>Calculate your exact Financial Independence number, years until retirement, and compound investment growth trajectory using the 4% Safe W…</span>
        </li>
        <li>
          <a href="tool.html?card=fiscal-quarter-finder">📊 Fiscal Quarter Finder</a>
          <span>Calendar quarters, the UK tax year (6 April–5 April) and the US federal fiscal year (starts 1 October). Pick a date; see which Q you are…</span>
        </li>
        <li>
          <a href="tool.html?card=flight-delay-compensation-checker">✈️ Flight Delay Compensation Checker</a>
          <span>Delayed, cancelled or denied boarding? UK261 can entitle you to up to £520 per passenger — and claim firms take 25–40% of it for filling…</span>
        </li>
        <li>
          <a href="tool.html?card=freelance-rate-calculator">💼 Freelance Rate Calculator</a>
          <span>Stop undercharging. Calculate your true sustainable hourly and day rates by factoring in unbillable admin time, self-employment taxes, eq…</span>
        </li>
        <li>
          <a href="tool.html?card=fuelcost">⛽ Fuel Cost Calculator Pro</a>
          <span>Calculate trip fuel costs, compare vehicles, track carbon footprint, and find optimal routes. Real-time calculations with environmental i…</span>
        </li>
        <li>
          <a href="tool.html?card=grocerybudget">🛒 Grocery Budget Tracker</a>
          <span>Track your grocery spending, categorize items, and stay within your budget with smart insights.</span>
        </li>
        <li>
          <a href="tool.html?card=hmrc-mileage-allowance-calculator">🚗 HMRC Mileage Allowance</a>
          <span>Tax-free Approved Mileage Allowance Payments for 2026/27: cars and vans 55p for the first 10,000 business miles then 25p; motorcycles 24p…</span>
        </li>
        <li>
          <a href="tool.html?card=holiday-entitlement-calculator">🌴 Holiday Entitlement & Pro-Rata Calculator</a>
          <span>Work out statutory UK holiday for part-timers, mid-year starters and leavers, and irregular-hours staff — including the 12.07% accrual me…</span>
        </li>
        <li>
          <a href="tool.html?card=hourly-to-annual-salary-converter">💷 Hourly ⇄ Annual Salary</a>
          <span>Convert an hourly rate to a yearly salary (and back) using your hours per week and weeks per year. Defaults match a UK full-time week. Gr…</span>
        </li>
        <li>
          <a href="tool.html?card=inflation">📉 Inflation Impact Calculator</a>
          <span>Calculate real-world purchasing power with historical data, multiple currencies, and personalized financial scenarios.</span>
        </li>
        <li>
          <a href="tool.html?card=interest">💰 Compound Interest Growth Visualiser</a>
          <span>Calculate how your money multiplies over time with compound interest—the 8th wonder of the world!</span>
        </li>
        <li>
          <a href="tool.html?card=investment">📈 Investment Growth Calculator</a>
          <span>Watch your money multiply: Calculate how small investments today can grow into significant wealth over time through compounding.</span>
        </li>
        <li>
          <a href="tool.html?card=invoice-late-fee-calculator">🧾 Invoice Late Fee Calculator</a>
          <span>Calculate statutory or agreed late-payment interest and a clear updated invoice total. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=ir35-comparator">⚖️ IR35 Inside vs Outside Comparator</a>
          <span>Compare take-home pay as a contractor: inside IR35 through an umbrella company versus outside IR35 through your own limited company. Edit…</span>
        </li>
        <li>
          <a href="tool.html?card=late-payment-interest-chaser">⏰ Late Payment Interest & Chaser Letter</a>
          <span>Unpaid invoice? UK law lets you charge 8% above the Bank of England base rate plus fixed compensation on overdue business invoices — auto…</span>
        </li>
        <li>
          <a href="tool.html?card=lease">🚗 Lease vs Buy Calculator</a>
          <span>Compare the true cost of leasing a vehicle against buying it outright or on finance, over the same term. Accounts for deposit, monthly pa…</span>
        </li>
        <li>
          <a href="tool.html?card=loan-amortization-schedule-calculator">📈 Loan & Mortgage Amortization Schedule Calculator</a>
          <span>Calculate monthly loan payments, view complete annual and monthly amortization schedules, and simulate the interest savings of extra prin…</span>
        </li>
        <li>
          <a href="tool.html?card=loan-amortization-schedule">📅 Loan Amortization Schedule</a>
          <span>Fixed-rate repayment loan. Payment = P × r(1+r)^n / ((1+r)^n − 1) with r = APR/12. First 24 months shown; totals cover the whole term. No…</span>
        </li>
        <li>
          <a href="tool.html?card=loan">💰 Smart Loan Calculator</a>
          <span>💸 Plan your finances: Calculate mortgage, car loan, personal loan payments with amortization schedule. Compare scenarios and save thousands!</span>
        </li>
        <li>
          <a href="tool.html?card=ltv-mortgage-calculator">🏦 LTV Mortgage Calculator</a>
          <span>Loan-to-value = mortgage ÷ property price. UK product tiers often sit at 60, 75, 85, 90, 95%. Deposit is price − loan. Not a lender decis…</span>
        </li>
        <li>
          <a href="tool.html?card=magnetic-eddy-current-brake">🧲 Lenz's Law Eddy Current Tube</a>
          <span>Lenz's law electromagnetic braking exhibit. Drop a strong neodymium magnet down metal tubes; circulating eddy currents oppose motion, cre…</span>
        </li>
        <li>
          <a href="tool.html?card=make-change-trainer">💰 Make Change Trainer (UK coins)</a>
          <span>Work out the change from UK coins and notes, then hand the exact coins with the fewest pieces. Learn the greedy method for 1p–£2 and prac…</span>
        </li>
        <li>
          <a href="tool.html?card=markup-vs-margin-calculator">💹 Markup vs Margin Calculator</a>
          <span>Convert cost, selling price, markup and profit margin. Markup is profit ÷ cost; margin is profit ÷ selling price. Mix them up and you und…</span>
        </li>
        <li>
          <a href="tool.html?card=mortgage-overpayment-calculator">🏦 Mortgage Overpayment Calculator</a>
          <span>See how overpaying cuts your mortgage term and total interest. Add a monthly overpayment, a lump sum, or both, and compare against paying…</span>
        </li>
        <li>
          <a href="tool.html?card=mortgage">🏠 Mortgage Calculator</a>
          <span>Calculate detailed mortgage payments with amortization schedules, extra payments analysis, and regional comparisons. 💰 Monthly payments •…</span>
        </li>
        <li>
          <a href="tool.html?card=networth">💰 Personal Finance Dashboard</a>
          <span>Complete personal finance dashboard: Track net worth, analyze assets vs liabilities, set financial goals, project future growth, and moni…</span>
        </li>
        <li>
          <a href="tool.html?card=notice-period-end-date-calculator">📅 Notice Period End Date</a>
          <span>Add weeks or months to the day you hand in notice. UK statutory minimums are 1 week after a month’s service and 1 week per year after two…</span>
        </li>
        <li>
          <a href="tool.html?card=number-to-words-cheque-writer">✍️ Number to Words (Cheque Writer)</a>
          <span>Spell out a number in British or American English, including the cheque / check form with fractional currency. Handles values from 0 to 9…</span>
        </li>
        <li>
          <a href="tool.html?card=overtime-pay-calculator">⏱️ Overtime Pay Calculator</a>
          <span>Split a week into regular hours and overtime at time-and-a-half, double time or a custom multiplier. Gross figures only — your contract a…</span>
        </li>
        <li>
          <a href="tool.html?card=overtime-pay-hourly-wage-calculator">💷 Hourly Wage, Overtime & Take-Home Estimator</a>
          <span>Enter your hourly rate and hours (including overtime at 1.5× or 2×, night or weekend premiums) to see weekly, monthly and annual gross pa…</span>
        </li>
        <li>
          <a href="tool.html?card=pro-rata-salary-calculator">💷 Pro Rata Salary Calculator</a>
          <span>Scale a full-time equivalent salary to part-time hours, or the other way. Uses working hours only — not tax, NI, or pension. UK job ads o…</span>
        </li>
        <li>
          <a href="tool.html?card=project-profitability-estimator">📊 Project Profitability Estimator</a>
          <span>Quote client projects from real labour, expenses and contingency while protecting a target profit margin. All calculations stay in your b…</span>
        </li>
        <li>
          <a href="tool.html?card=redundancy-notice-calculator">📋 Redundancy & Notice Entitlement Calculator</a>
          <span>Work out your UK statutory redundancy pay, notice period, accrued holiday and how much of a settlement is tax-free — with the full age-ba…</span>
        </li>
        <li>
          <a href="tool.html?card=rent">🏠 Rent Calculator</a>
          <span>Split rent among roommates, calculate per-person costs, and account for room size differences. Supports multiple currencies and custom sp…</span>
        </li>
        <li>
          <a href="tool.html?card=rental-yield-calculator">🔑 Rental Yield Calculator</a>
          <span>Gross yield is annual rent ÷ purchase price. Net yield subtracts the yearly costs you type. A listing’s “yield” is often gross. This is a…</span>
        </li>
        <li>
          <a href="tool.html?card=rental-yield-deal-analyser">🏠 Rental Yield Deal Analyser</a>
          <span>Compare gross yield, net yield and monthly cash flow for a prospective rental property. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=retirement">💰 Retirement Calculator</a>
          <span>Estimate your retirement savings growth with compound interest. ⚠️ Educational only — consult a financial advisor.</span>
        </li>
        <li>
          <a href="tool.html?card=reward-site-reality-check">💸 Reward Site Earnings Reality Check</a>
          <span>Work out what survey and get-paid-to sites are actually worth per hour before you give them your evenings. Uses realistic rate bands rath…</span>
        </li>
        <li>
          <a href="tool.html?card=roi">📈 ROI Calculator</a>
          <span>Calculate Return on Investment with advanced metrics and comparisons. Supports annualized returns and multiple currencies.</span>
        </li>
        <li>
          <a href="tool.html?card=rule-of-72-doubling-calculator">⏳ Rule of 72 Doubling Time</a>
          <span>Years to double ≈ 72 ÷ annual %. At 6% that’s about 12 years; at 9% about 8. The exact figure is ln(2)/ln(1+r). A back-of-envelope for in…</span>
        </li>
        <li>
          <a href="tool.html?card=salary">💰 Salary Calculator</a>
          <span>Calculate net salary after taxes, deductions, and contributions. ⚠️ Estimates only — consult a tax professional.</span>
        </li>
        <li>
          <a href="tool.html?card=salarycompare">🧾 Take-Home Pay Breakdown</a>
          <span>Turn an annual salary into what actually lands in your account, broken down by pay period. Uses 2024/25-style UK income tax bands, Class…</span>
        </li>
        <li>
          <a href="tool.html?card=sales-commission-calculator">💼 Sales Commission Calculator</a>
          <span>Commission from a sale amount and rate, with an optional second-tier rate above a threshold (common in sales plans). Gross figures — tax…</span>
        </li>
        <li>
          <a href="tool.html?card=savings">💰 Savings Calculator</a>
          <span>Calculate how much your savings will grow with regular deposits and compound interest.</span>
        </li>
        <li>
          <a href="tool.html?card=small-claims-lba-generator">📄 Small Claims Letter Before Action Builder</a>
          <span>Build a proper Letter Before Action for an unpaid debt — with statutory interest calculated to the day, a claim-fee estimate and a 14-day…</span>
        </li>
        <li>
          <a href="tool.html?card=smart-contract-gas-estimator">⛽ Web3 Gas Fee Estimator</a>
          <span>Compare real-time decentralized transaction fees, DEX swap overhead, and smart contract execution costs across Solana, Base, Ethereum L1…</span>
        </li>
        <li>
          <a href="tool.html?card=splitbill">🍽️ Split Bill Calculator</a>
          <span>Split restaurant bills, group expenses, or shared purchases with intelligent distribution options. ✨ Perfect for dinners, trips, and grou…</span>
        </li>
        <li>
          <a href="tool.html?card=stripe-paypal-fee-calculator">💳 Stripe & PayPal Fee Calculator</a>
          <span>Reverse a published percentage + pence fee so you know what you keep, or what to charge to net a target. Default rates are the common UK…</span>
        </li>
        <li>
          <a href="tool.html?card=studentloan">💰 Student Loan Calculator</a>
          <span>Calculate student loan payments, total interest, and repayment timeline. Compare different repayment plans and see how extra payments can…</span>
        </li>
        <li>
          <a href="tool.html?card=subscription">Subscription Tracker</a>
          <span>Track your subscriptions, manage renewals, and optimize spending</span>
        </li>
        <li>
          <a href="tool.html?card=tax">💰 Tax Estimator & Calculator</a>
          <span>Estimate income tax, national insurance, and take-home pay for UK taxpayers. Based on 2024-25 UK tax bands.</span>
        </li>
        <li>
          <a href="tool.html?card=tenancy-deposit-calculator">🏠 Tenancy Deposit Calculator (England)</a>
          <span>Check your deposit against the statutory cap, see when it must be protected and returned, and understand the remedies if the landlord get…</span>
        </li>
        <li>
          <a href="tool.html?card=tip-calculator">🧾 Tip Calculator</a>
          <span>Split a bill and tip fairly — choose a percentage or a custom tip, share between friends, and see per-person totals.</span>
        </li>
        <li>
          <a href="tool.html?card=tip-split-bill-per-person">🍽️ Restaurant Bill Splitter with Itemised Shares</a>
          <span>Split a restaurant bill fairly: add each dish and tick who shared it, set a service charge or tip, and get an exact per-person total incl…</span>
        </li>
        <li>
          <a href="tool.html?card=ucas-tariff-points-calculator">🎓 UCAS Tariff Points</a>
          <span>Add A-level, AS and T Level grades to a running UCAS tariff total. Offers are often “BBB (120)” — this is the current A-level band (A* =…</span>
        </li>
        <li>
          <a href="tool.html?card=uk-holiday-entitlement-calculator">🏖️ UK Holiday Entitlement</a>
          <span>Statutory paid holiday in Great Britain is 5.6 weeks a year (28 days for a 5-day week), which may include bank holidays if your contract…</span>
        </li>
        <li>
          <a href="tool.html?card=unit-price-comparator">🛒 Unit Price Comparator</a>
          <span>Shops price things so you cannot compare them: 340 g here, 12 × 30 g there, "3 for £5" on the shelf edge. Put in what is actually o…</span>
        </li>
        <li>
          <a href="tool.html?card=vat-gst-sales-tax-calculator">💷 VAT / GST / Sales Tax Calculator</a>
          <span>Add tax to a net price or extract tax from a gross (inc-VAT) figure. Presets cover UK VAT, common EU GST/VAT rates and US-style sales tax…</span>
        </li>
        <li>
          <a href="tool.html?card=vat-sales-tax-calculator">🧾 VAT & Sales Tax Calculator (Add or Remove)</a>
          <span>Add VAT to a net price or strip it out of a gross price. Pick a country preset (UK 20%, Ireland 23%, Germany 19%, France 20%, etc.) or ty…</span>
        </li>
        <li>
          <a href="tool.html?card=wholesale-pricing-margin-calculator">🏷️ Wholesale Pricing & Margin</a>
          <span>Set retail and wholesale prices while seeing your margin and the retailer’s margin side by side. All calculations stay in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=xmas-gift-budget">💰 Christmas Gift Budget Planner</a>
          <span>Plan, track, and optimize your Christmas gift spending. Avoid overspending with smart budgeting! ✅ Features: Gift ideas, price tracking…</span>
        </li>
        <li>
          <a href="tool.html?card=youth-money-tracker">💸 Money Tracker</a>
          <span>Track your spending, set a budget, and see where your money goes — simple enough for your first budget</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="science-and-engineering">
      <h2>🔬 Science & Engineering <span class="count">182 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=acoustic-levitation-standing-wave">🔊 Ultrasonic Acoustic Levitation</a>
          <span>40 kHz ultrasonic standing wave acoustic trap. Non-contact levitation of micro-beads and liquid droplets suspended in mid-air at acoustic…</span>
        </li>
        <li>
          <a href="tool.html?card=acres-hectares-sqm-converter">🌾 Acres ⇄ Hectares ⇄ m²</a>
          <span>International acre is exactly 4,046.8564224 m²; a hectare is 10,000 m² (a 100 m square). UK land ads mix acres and hectares. Edit any field.</span>
        </li>
        <li>
          <a href="tool.html?card=anatomy">Anatomy Tools & Facts</a>
          <span>Body Mass Index</span>
        </li>
        <li>
          <a href="tool.html?card=antipode-gravity-tunnel-explorer">🕳️ Antipode & Gravity Tunnel Explorer</a>
          <span>Find the exact point on the far side of the planet from anywhere, then drill a straight frictionless tunnel to any second place and drop…</span>
        </li>
        <li>
          <a href="tool.html?card=aspect-ratio-resizer">📐 Aspect Ratio Resizer</a>
          <span>Calculate pixel dimensions while locking exact aspect ratios (16:9 widescreen, 9:16 vertical TikTok/Shorts, 4:3 classic, 1:1 square, 21:9…</span>
        </li>
        <li>
          <a href="tool.html?card=astronomy">Astronomy Calculators</a>
          <span>Planets move in elliptical orbits with the Sun at one focus.</span>
        </li>
        <li>
          <a href="tool.html?card=atmospheric-aurora-borealis-field">🌌 Aurora Solar Wind Chamber</a>
          <span>Kristian Birkeland's Terrella experiment. Solar wind plasma streams channeled along geomagnetic dipole field lines excite shimmering atmo…</span>
        </li>
        <li>
          <a href="tool.html?card=atmospheric-plasma-globe">⚡ Tesla Atmospheric Plasma</a>
          <span>High-frequency Tesla coil discharge globe. Noble gas ionization streamers branch from the central electrode and focus to your touch via c…</span>
        </li>
        <li>
          <a href="tool.html?card=bar-psi-kpa-pressure-converter">⏲️ Bar ⇄ PSI ⇄ kPa</a>
          <span>Tyre, compressor and scuba pressures. 1 bar = 100 kPa = 14.5038 psi. Standard atmosphere is 101.325 kPa (14.696 psi). Gauge vs absolute i…</span>
        </li>
        <li>
          <a href="tool.html?card=battery-runtime-mah-calculator">🔋 Battery Runtime (mAh)</a>
          <span>Hours ≈ (capacity mAh × (voltage / load voltage) × efficiency) / load mA. A 2000 mAh cell at 100 mA is about 20 hours at 100% — real pack…</span>
        </li>
        <li>
          <a href="tool.html?card=battery-sizing">Battery Sizing Calculator</a>
          <span>Accounts for battery aging, temperature, and discharge limits</span>
        </li>
        <li>
          <a href="tool.html?card=beam-vibration-modal-analysis">🏗️ Beam Vibration Analyzer</a>
          <span>Compute natural flexural vibration eigenfrequencies and mode shapes for structural beams ($EI \frac{\partial^4 w}{\partial x^4} + \rho A…</span>
        </li>
        <li>
          <a href="tool.html?card=beaufort-wind-scale">🌬️ Beaufort Wind Scale</a>
          <span>Convert wind speed to a Beaufort force (0–12) using the Met Office mean-speed bands. Force is a class, not a precision instrument. Gusts…</span>
        </li>
        <li>
          <a href="tool.html?card=bernoulli-levitating-air-stream">🎈 Coanda & Bernoulli Air Levitation</a>
          <span>Aerodynamic levitation exhibit. High-velocity air jet traps a floating sphere via Bernoulli low-pressure depression and Coandă wall adhes…</span>
        </li>
        <li>
          <a href="tool.html?card=biology-tools">Biology Tools</a>
          <span>Quick Guide</span>
        </li>
        <li>
          <a href="tool.html?card=boiling-point-finder">Boiling Point Finder</a>
          <span>Quick Examples:</span>
        </li>
        <li>
          <a href="tool.html?card=breaker-sizing">⚡ Breaker Sizing Calculator</a>
          <span>Quick Examples:</span>
        </li>
        <li>
          <a href="tool.html?card=builders-workmate">🔨 Virtual Builder's Workmate</a>
          <span>Virtual measurement and leveling tools using device sensors. Requires camera and motion sensor permissions.</span>
        </li>
        <li>
          <a href="tool.html?card=cable-length">⚡ Cable Length & Voltage Drop</a>
          <span>Common Scenarios:</span>
        </li>
        <li>
          <a href="tool.html?card=capacitor-calculator">Capacitor Calculator</a>
          <span>Calculate capacitor values, RC time constants, impedance, and filter characteristics. ⚠️ Educational only — verify with datasheets and pr…</span>
        </li>
        <li>
          <a href="tool.html?card=carbon-14-dating-calculator">🦴 The Radiocarbon Laboratory</a>
          <span>Willard Libby’s clock, as a working exhibit. Living tissue is in equilibrium with atmospheric ¹⁴C; after death the isotope decays with a…</span>
        </li>
        <li>
          <a href="tool.html?card=celsius-fahrenheit-kelvin-converter">🌡️ Celsius ⇄ Fahrenheit ⇄ Kelvin</a>
          <span>°F = °C × 9/5 + 32. Kelvin = °C + 273.15. Absolute zero is 0 K (−273.15 °C). Edit any box — weather, ovens and science labs all use diffe…</span>
        </li>
        <li>
          <a href="tool.html?card=chaotic-magnetic-pendulum">🧭 Chaotic Magnetic Pendulum</a>
          <span>Nonlinear chaos theory exhibit. A metallic pendulum swings over three magnetic attractors, demonstrating sensitive dependence on initial…</span>
        </li>
        <li>
          <a href="tool.html?card=chemical-solution-dilution">🧪 Solution Dilution Lab</a>
          <span>Precision wet-lab chemistry solver for serial dilutions ($C_1 V_1 = C_2 V_2$) and molarity-to-mass conversions ($\text{Mass} = M \times V…</span>
        </li>
        <li>
          <a href="tool.html?card=circuit-calculator">🔌 Circuit Calculator</a>
          <span>Calculate circuit load, breaker size, and wire sizing. Perfect for DIY projects and planning.</span>
        </li>
        <li>
          <a href="tool.html?card=climbing-anchor-force-calculator">🧗 Climbing Anchor Force & Fall Factor Calculator</a>
          <span>A falling climber does not load the system with their body weight — they load it with several times that, and the top runner takes more t…</span>
        </li>
        <li>
          <a href="tool.html?card=color-palette-extractor">🎨 Color Palette Extractor</a>
          <span>Generate algorithmic color harmonies (Complementary, Triadic, Analogous, Split) and verify accessibility with real-time WCAG 2.1 AA/AAA c…</span>
        </li>
        <li>
          <a href="tool.html?card=compass-bearings-trainer">🧭 Compass Bearings Trainer</a>
          <span>Learn the 16-point compass rose: convert between named bearings and degrees, then practise reading them on a marked compass — forward and…</span>
        </li>
        <li>
          <a href="tool.html?card=conduit-sizing">⚡ Conduit Sizing Calculator</a>
          <span>Calculate conduit sizes based on NEC requirements, wire types, and installation conditions. ⚠️ Disclaimer: For educational purposes. Alwa…</span>
        </li>
        <li>
          <a href="tool.html?card=conservation-lux-hours">💡 The Light Budget</a>
          <span>Light is a loan with interest. Museums cap both instant lux and lux-hours per year. Pick a material class, the gallery level and the hour…</span>
        </li>
        <li>
          <a href="tool.html?card=coordinate-format-translator">🧭 Coordinate Format Translator</a>
          <span>One position, every notation: decimal degrees, degrees-minutes-seconds, marine DDM, UTM, MGRS, the British Ordnance Survey grid, geohash…</span>
        </li>
        <li>
          <a href="tool.html?card=cosmic-ray-cloud-chamber">🌫️ Wilson Cloud Chamber</a>
          <span>Supersaturated alcohol vapor chamber detecting cosmic muons and subatomic radioactive decay tracks via ion-nucleated condensation.</span>
        </li>
        <li>
          <a href="tool.html?card=coupled-oscillators-normal-modes">🎛️ Coupled Oscillators Lab</a>
          <span>Simulate multi-degree-of-freedom coupled mechanical oscillators. Observe symmetric ($\omega_1$) vs anti-symmetric ($\omega_2$) normal mod…</span>
        </li>
        <li>
          <a href="tool.html?card=cymatic-sound-sculpture-3d">🔉 3D Cymatic Sound Sculpture</a>
          <span>Acoustic resonance installation. Granular silica particles migrate across a vibrating resonant Chladni plate into standing wave geometric…</span>
        </li>
        <li>
          <a href="tool.html?card=cymatics-chladni-plate">📐 Chladni Cymatics Plate</a>
          <span>Explore Ernst Chladni's 1787 acoustic nodal resonance figures. Observe sand grains scatter away from high-amplitude vibrating antinodes a…</span>
        </li>
        <li>
          <a href="tool.html?card=damped-harmonic-oscillator">⚡ Damped Oscillator Simulator</a>
          <span>Analyze classical mass-spring-damper dynamics ($m\ddot{x} + c\dot{x} + kx = F_0\cos\omega t$). Inspect damping ratios ($\zeta$), Q-factor…</span>
        </li>
        <li>
          <a href="tool.html?card=dew-point-calculator">💧 Dew Point Calculator</a>
          <span>Magnus formula dew point from air temperature and relative humidity. Condensation risk on a surface is when the surface is at or below th…</span>
        </li>
        <li>
          <a href="tool.html?card=diffraction-grating-laser-spectrometer">🌈 Holographic Laser Spectrograph</a>
          <span>Optical spectrometer bench. High-density holographic diffraction grating disperses atomic gas emission into discrete quantum spectral fin…</span>
        </li>
        <li>
          <a href="tool.html?card=dna-helix-3d-builder">🧬 DNA Helix 3D Builder</a>
          <span>Type any DNA sequence and watch it become a spinning double helix — with correct A‑T / G‑C pairing, hydrogen bonds, live GC content, mRNA…</span>
        </li>
        <li>
          <a href="tool.html?card=doppler-effect-simulator">🔊 Doppler Effect Simulator</a>
          <span>Simulate frequency shifts and wavefront compression for acoustic sound waves and relativistic light redshift ($z$). Features real-time wa…</span>
        </li>
        <li>
          <a href="tool.html?card=double-pendulum-chaos">🌀 Double Pendulum Chaos</a>
          <span>Simulate non-linear Hamiltonian chaos via Lagrangian mechanics solved with 4th-Order Runge-Kutta (RK4). Track sensitive dependence on ini…</span>
        </li>
        <li>
          <a href="tool.html?card=double-slit-quantum-eraser">🔬 Quantum Eraser & Double Slit</a>
          <span>Quantum optics delayed-choice experiment. Observe wave interference, wavefunction collapse via which-way detectors, and quantum erasure r…</span>
        </li>
        <li>
          <a href="tool.html?card=earthing-calculator">⚡ Earthing Conductor Calculator</a>
          <span>For qualified electricians. Always verify with local regulations and manufacturer specifications.</span>
        </li>
        <li>
          <a href="tool.html?card=eco-footprint-accelerator">🌍 Eco Footprint Calculator</a>
          <span>Move past vague carbon guilt. PlanetPositive pinpoints the exact 80/20 high-leverage lifestyle actions that slash personal emissions the…</span>
        </li>
        <li>
          <a href="tool.html?card=ecology">🌍 Professional Ecology Calculator</a>
          <span>🔬 A comprehensive suite of ecological calculations for researchers, environmental scientists, and conservation professionals. Includes st…</span>
        </li>
        <li>
          <a href="tool.html?card=edu-anatomy">🫀 Human Anatomy Explorer</a>
          <span>Interactive body systems — click organs and systems to learn their functions, facts, and connections</span>
        </li>
        <li>
          <a href="tool.html?card=edu-country-data">🌍 Country Data Visualizer</a>
          <span>Compare countries by population, area, GDP, and more — with animated bar charts and data cards</span>
        </li>
        <li>
          <a href="tool.html?card=edu-dna-translator">🧬 DNA → Protein Translator</a>
          <span>Paste a DNA or mRNA sequence and watch it get transcribed and translated into amino acids — with a visual codon table</span>
        </li>
        <li>
          <a href="tool.html?card=edu-periodic-table">⚛️ Interactive Periodic Table</a>
          <span>Explore all 118 elements — click any element for detailed properties, electron configuration, and fun facts</span>
        </li>
        <li>
          <a href="tool.html?card=edu-rock-identifier">🪨 Rock & Mineral Identifier</a>
          <span>Answer a few questions about your rock and get an identification — with visual examples and properties</span>
        </li>
        <li>
          <a href="tool.html?card=edu-timeline-builder">📜 Historical Timeline Builder</a>
          <span>Create beautiful visual timelines — add events, see them plotted chronologically with color-coded categories</span>
        </li>
        <li>
          <a href="tool.html?card=electrical-standards">📚 Electrical Standards Guide</a>
          <span>📋 Copy Full Report 💾 Save as PDF // Global Electrical Standards Reference let currentRegion = 'iec'; const standardsData = { iec: { name…</span>
        </li>
        <li>
          <a href="tool.html?card=electricity">⚡ Electrical Engineering Calculator</a>
          <span>🔬 A comprehensive electrical engineering toolkit for professionals and students. Includes circuit analysis, power calculations, and energ…</span>
        </li>
        <li>
          <a href="tool.html?card=energy">⚡ Energy Consumption Calculator</a>
          <span>Calculate electricity costs, carbon footprint, and savings potential for any appliance. Track your energy usage and find ways to save money!</span>
        </li>
        <li>
          <a href="tool.html?card=environmental-science">🌍 Environmental Science Tools</a>
          <span>Calculate environmental impacts, explore sustainability metrics, and learn fascinating facts about Earth's systems. Make informed decisio…</span>
        </li>
        <li>
          <a href="tool.html?card=evolution-walker">Evolution AI Walker</a>
          <span>Watch AI creatures evolve to walk, survive disasters, find food, and adapt! 10 terrain types, random events, food chains, achievements, a…</span>
        </li>
        <li>
          <a href="tool.html?card=experiment-ideas">🔬 Science Experiment Generator</a>
          <span>Generate creative, hands-on science experiment ideas for all ages. Perfect for students, teachers, and curious minds!</span>
        </li>
        <li>
          <a href="tool.html?card=faraday-waves-cymatics-fluid">💧 Faraday Fluid Waves</a>
          <span>Simulate Michael Faraday's 1831 parametric liquid surface waves ($\omega^2 = [gk + \frac{\sigma}{\rho}k^3]\tanh kh$). Observe subharmonic…</span>
        </li>
        <li>
          <a href="tool.html?card=feet-inches-cm-height-converter">📏 Feet & Inches ⇄ cm</a>
          <span>Convert height between feet+inches, centimetres and metres. Uses the international inch (exactly 25.4 mm). Edit any box — the others update.</span>
        </li>
        <li>
          <a href="tool.html?card=ferrofluid-spike-sculpture">🧲 Ferrofluid Spiking Lab</a>
          <span>Rosensweig normal-field magnetic instability simulator. Superparamagnetic liquid self-organizes into conical spikes balancing surface ten…</span>
        </li>
        <li>
          <a href="tool.html?card=fiber-optic-total-internal-reflection">✨ Fiber Optic Light Guide Lab</a>
          <span>Total internal reflection fiber optics lab. Explore critical angle guidance, acceptance cone numerical aperture (NA), and macro-bending r…</span>
        </li>
        <li>
          <a href="tool.html?card=flue-draft-stove-sizing-calculator">🔥 Flue Draft & Stove Sizing Calculator</a>
          <span>A chimney is an engine: hot gas inside, cold air outside, and the density difference pulls the fire along. This works out how much draugh…</span>
        </li>
        <li>
          <a href="tool.html?card=fluid-reynolds-number">🌊 Reynolds Number Simulator</a>
          <span>Calculate the dimensionless Reynolds number ($\text{Re} = \frac{\rho v D}{\mu}$) for internal pipe flow and aerodynamics. Visualize lamin…</span>
        </li>
        <li>
          <a href="tool.html?card=fluid-vortex-smoke-tunnel">🌪️ Fluid Smoke Tunnel</a>
          <span>Aerodynamic wind tunnel museum exhibit. Visualize laminar airflow, von Kármán vortex shedding, and lift/drag forces around aerodynamic ob…</span>
        </li>
        <li>
          <a href="tool.html?card=foucault-pendulum-earth-spin">🌍 Foucault Pendulum Spin</a>
          <span>Léon Foucault's 1851 Paris Panthéon experiment proving Earth's diurnal rotation. The swing plane stays fixed in inertial space while Eart…</span>
        </li>
        <li>
          <a href="tool.html?card=four-bar-linkage-kinematics">⚙️ Four-Bar Mechanism Lab</a>
          <span>Synthesize planar four-bar kinematic mechanisms. Classify via Grashof's Theorem ($s + l \le p + q$), trace coupler curves (Chebyshev, Wat…</span>
        </li>
        <li>
          <a href="tool.html?card=gallons-litres-pints-converter">🍺 Gallons, Litres & Pints</a>
          <span>UK pint is 568 ml; US pint is 473 ml. UK gallon is 4.54609 L; US gallon is 3.78541 L. Edit any box — the others follow using the same liq…</span>
        </li>
        <li>
          <a href="tool.html?card=genetics">🧬 Genetics Laboratory</a>
          <span>Explore genetics through interactive simulations, DNA analysis tools, and educational content. Perfect for students and enthusiasts!</span>
        </li>
        <li>
          <a href="tool.html?card=geodesic-area-parcel-calculator">📐 Geodesic Area & Parcel Calculator</a>
          <span>Type or click out a boundary and get its true area on the curved Earth using the spherical-excess formula — the same maths GIS packages u…</span>
        </li>
        <li>
          <a href="tool.html?card=geography-flag-capital-quiz">🌍 Flag & Capital Quiz</a>
          <span>Learn 40 countries with flip flashcards, then test yourself on capitals and flags. Streaks, scoring and fun facts make world geography st…</span>
        </li>
        <li>
          <a href="tool.html?card=geography">Geography Helper</a>
          <span>Add countries, capitals, and notes to build your geography study list.</span>
        </li>
        <li>
          <a href="tool.html?card=geology">Geology Tools & Facts</a>
          <span>Explore geology concepts and discover fascinating facts about Earth's structure and processes.</span>
        </li>
        <li>
          <a href="tool.html?card=gps-coordinates-dms-decimal">🧭 GPS DMS ⇄ Decimal</a>
          <span>Convert latitude and longitude between degrees-minutes-seconds and decimal degrees. Decimal = degrees + minutes/60 + seconds/3600. South…</span>
        </li>
        <li>
          <a href="tool.html?card=gravitational-lensing-black-hole">🕳️ Gravitational Lensing Lab</a>
          <span>General Relativity astrophysics exhibit. Drag a supermassive Schwarzschild black hole across cosmic starfields to observe Einstein rings…</span>
        </li>
        <li>
          <a href="tool.html?card=gravitational-n-body-galaxy-collision">🌌 Galaxy Collision & Tidal Tails</a>
          <span>Gravitational N-body astrophysical simulation. Watch two disk galaxies collide as differential tidal forces eject long parabolic stellar…</span>
        </li>
        <li>
          <a href="tool.html?card=great-circle-route-planner">✈️ Great-Circle Route Planner</a>
          <span>Why does a London–Tokyo flight arc over Siberia? Compute the true shortest path between any two points — Vincenty distance on the real el…</span>
        </li>
        <li>
          <a href="tool.html?card=gyroscopic-precession-dynamics">🧭 Gyroscopic Precession Lab</a>
          <span>Explore rigid body rotational mechanics ($\boldsymbol{\tau} = \boldsymbol{\Omega}_p \times \mathbf{L}$). Calculate steady precession velo…</span>
        </li>
        <li>
          <a href="tool.html?card=heat-index-calculator">🥵 Heat Index Calculator</a>
          <span>NWS Rothfusz heat index from shade air temperature and relative humidity. Officially for ≥ 27 °C. Full sun can feel several degrees worse…</span>
        </li>
        <li>
          <a href="tool.html?card=hike-time-planner">🥾 Hike & Walk Time Planner</a>
          <span>Built on Naismith's Rule, the estimate mountain rescue has used for a century: allow an hour for every 5 km, plus a minute for every 10 m…</span>
        </li>
        <li>
          <a href="tool.html?card=horizon-line-of-sight-calculator">🌅 Horizon & Line-of-Sight Calculator</a>
          <span>How far can you actually see, and how much of that distant hill, ship or radio mast is hidden behind the bulge of the Earth? Enter two he…</span>
        </li>
        <li>
          <a href="tool.html?card=horsepower-kw-torque-converter">🏎️ Horsepower, kW & Torque</a>
          <span>Convert mechanical horsepower, metric PS and kilowatts, and compute power from torque × RPM. 1 hp = 745.7 W; 1 PS = 735.5 W. Power (kW) =…</span>
        </li>
        <li>
          <a href="tool.html?card=inductance-calculator">⚡ Inductance Calculator</a>
          <span>Professional inductance calculator with real-time visualization, multiple coil types, and comprehensive electrical analysis.</span>
        </li>
        <li>
          <a href="tool.html?card=inverter-sizing">⚡ Solar Inverter Sizing</a>
          <span>Essential for solar/off-grid setups: Calculate the right inverter size for your needs. Always consult a professional before installation!</span>
        </li>
        <li>
          <a href="tool.html?card=kelvin-helmholtz-cloud-instability">☁️ Kelvin-Helmholtz Waves</a>
          <span>Atmospheric fluid shear-flow instability. Two fluid layers with differing densities and velocities roll up into breaking ocean-billow clo…</span>
        </li>
        <li>
          <a href="tool.html?card=kitchen-science-experiments">🧪 Kitchen Science Lab</a>
          <span>10 safe, spectacular experiments using stuff already in your kitchen — each with step-by-step instructions, the real science explained, a…</span>
        </li>
        <li>
          <a href="tool.html?card=knots-mph-kph-converter">⛵ Knots ⇄ mph ⇄ km/h</a>
          <span>One knot is one nautical mile per hour. A nautical mile is exactly 1,852 m, so 1 kn = 1.852 km/h ≈ 1.15078 mph. Used by ships, aircraft a…</span>
        </li>
        <li>
          <a href="tool.html?card=koppen-climate-classifier">🌦️ Köppen Climate Classifier</a>
          <span>Type in twelve monthly temperatures and rainfall totals and this runs the full Köppen–Geiger decision tree on them — the same classificat…</span>
        </li>
        <li>
          <a href="tool.html?card=lab-planner">Lab Planner</a>
          <span>Plan lab experiments by organizing materials, steps, and timing. Enter details and generate a structured plan.</span>
        </li>
        <li>
          <a href="tool.html?card=lab-safety">Lab Safety Tools & Facts</a>
          <span>Review lab safety rules and generate reminders for safe scientific work.</span>
        </li>
        <li>
          <a href="tool.html?card=led-current-limiting-resistor">💡 LED Current-Limiting Resistor</a>
          <span>R = (supply − LED Vf) / current. Typical Vf: red ~1.8–2.2 V, green/blue/white ~3.0–3.4 V. Always put a resistor in series with a bare LED…</span>
        </li>
        <li>
          <a href="tool.html?card=led-watt-equivalent-calculator">💡 LED Watt Equivalent Calculator</a>
          <span>Rough incandescent, halogen and CFL wattage versus LED lumens. Packaging lumens win over “60 W equivalent” marketing. Efficacy defaults t…</span>
        </li>
        <li>
          <a href="tool.html?card=lighting-design">💡 Lighting Design Calculator</a>
          <span>Professional lighting design calculator with comprehensive room analysis, fixture selection, and energy efficiency recommendations. ⚠️ Ed…</span>
        </li>
        <li>
          <a href="tool.html?card=lissajous-laser-oscillograph">⚡ Lissajous Laser Projector</a>
          <span>Dual-galvanometer laser projector simulating orthogonal harmonic oscillations, phase shifts, and phosphorescent persistence curves.</span>
        </li>
        <li>
          <a href="tool.html?card=load-calculator">⚡ Electrical Load Calculator</a>
          <span>🔧 Professional-grade calculations: Calculate electrical loads for homes, offices, or circuits. Includes NEC compliance tips and safety wa…</span>
        </li>
        <li>
          <a href="tool.html?card=logic-gate-circuit-simulator">⚡ Logic Gate Simulator</a>
          <span>Simulate fundamental boolean logic gates (AND, OR, XOR, NAND) and digital circuits with live voltage probes and dynamic truth tables.</span>
        </li>
        <li>
          <a href="tool.html?card=lumen-lux-calculator">💡 Lumens ⇄ Lux</a>
          <span>Lux = lumens ÷ area (m²) when light is spread evenly. A 800 lm bulb over a 10 m² desk is 80 lux — offices often want 300–500 lux. Beam an…</span>
        </li>
        <li>
          <a href="tool.html?card=magnetic-levitation-meissner-lab">🧲 Superconductor Flux Pinning</a>
          <span>Type-II high-temperature superconductor cryogenic lab. Explore Meissner effect magnetic field expulsion and quantum flux pinning levitation.</span>
        </li>
        <li>
          <a href="tool.html?card=materials-science">Materials Science Tools & Facts</a>
          <span>Calculate material properties and explore fascinating facts about metals, polymers, and composites. Uses real material properties from es…</span>
        </li>
        <li>
          <a href="tool.html?card=melting-point-finder">🔥 Melting Point Explorer</a>
          <span>Explore melting points of hundreds of substances. Compare materials, convert units, and learn about phase changes.</span>
        </li>
        <li>
          <a href="tool.html?card=microbiology">🔬 Microbiology Tools & Facts</a>
          <span>Calculate essential microbiology values and explore fascinating facts about the invisible world of microbes. 🧫 Growth rates • Dilutions •…</span>
        </li>
        <li>
          <a href="tool.html?card=moire-interference-lattice">〰️ Moiré Optical Interference</a>
          <span>Kinetic optical interference exhibit. Overlay geometric optical gratings and rotate them to observe emergent macro-scale moiré superlatti…</span>
        </li>
        <li>
          <a href="tool.html?card=molecule-3d-viewer">⚛️ Molecule 3D Viewer</a>
          <span>Eleven molecules and crystals as true ball-and-stick 3D — from water to a salt lattice to a diamond unit cell. Bonds are detected automat…</span>
        </li>
        <li>
          <a href="tool.html?card=motor-startup">⚡ Motor Startup Calculator</a>
          <span>Calculate motor running/starting currents, cable sizing, protection devices, and voltage drop analysis for electrical installations. 🔧 Ru…</span>
        </li>
        <li>
          <a href="tool.html?card=nature-id-trainer">🍄 Nature ID Trainer</a>
          <span>Learn to spot 24 common UK/European plants and fungi from the features that actually matter in the field — leaf shape, flower colour, ste…</span>
        </li>
        <li>
          <a href="tool.html?card=newton-cradle-momentum-mesh">⚪ Kinetic Momentum Cradle</a>
          <span>Conservation of momentum and kinetic energy exhibit. Demonstrates compressive acoustic stress wave transmission across elastic collision…</span>
        </li>
        <li>
          <a href="tool.html?card=ohms-law">⚡ Ohm's Law Calculator</a>
          <span>Instant voltage, current, resistance, and power calculations.</span>
        </li>
        <li>
          <a href="tool.html?card=optical-soliton-wave-tank">🌊 Soliton Wave Flume Tank</a>
          <span>John Scott Russell's 1834 hydrodynamic flume exhibit. Simulates the Korteweg–de Vries (KdV) equation where nonlinear steepening balances…</span>
        </li>
        <li>
          <a href="tool.html?card=optics">🔬 Optics Calculator & Explorer</a>
          <span>Calculate optical properties, simulate light behavior, and explore fascinating physics of light.</span>
        </li>
        <li>
          <a href="tool.html?card=optomechanical-laser-tweezer">🔬 Optical Tweezers & Trapping</a>
          <span>Arthur Ashkin's 2018 Nobel Prize optical trap. Focused Gaussian laser beam gradient forces trap micro-particles and counter thermal Brown…</span>
        </li>
        <li>
          <a href="tool.html?card=orbital-mechanics-calculator">🛰️ Orbital Mechanics Lab</a>
          <span>Calculate orbital velocity, Keplerian period, and gravitational escape speed around celestial bodies. Analyze Low Earth Orbit, GPS altitu…</span>
        </li>
        <li>
          <a href="tool.html?card=oscilloscope">📡 Oscilloscope Visualizer</a>
          <span>Visualize and analyze waveforms in real-time. Generate signals, adjust parameters, and explore waveforms.</span>
        </li>
        <li>
          <a href="tool.html?card=pcb-trace-width">⚡ PCB Trace Width Calculator</a>
          <span>Estimate minimum PCB trace width for a given current, copper thickness, and temperature rise.</span>
        </li>
        <li>
          <a href="tool.html?card=pendulum-wave-harmonograph">🕰️ Pendulum Wave Array</a>
          <span>Kinetic museum wave array. Independent pendulums with calibrated lengths execute serpentine traveling waves, choreographing standing wave…</span>
        </li>
        <li>
          <a href="tool.html?card=periodic-table-explorer">⚛️ Periodic Table Explorer</a>
          <span>Explore the fundamental building blocks of the universe. Search by name, symbol, or atomic number, filter by chemical series, and inspect…</span>
        </li>
        <li>
          <a href="tool.html?card=photo-exposure-lab">📷 Exposure, Depth of Field & Filter Lab</a>
          <span>Four things photographers work out in their heads and get wrong under pressure: what shutter speed balances a change of aperture, how lon…</span>
        </li>
        <li>
          <a href="tool.html?card=photon-quantum-energy">🔬 Quantum Energy Calculator</a>
          <span>Calculate electromagnetic photon energy ($E = h\nu = hc/\lambda$), momentum ($p = h/\lambda$), and matter wave de Broglie wavelengths acr…</span>
        </li>
        <li>
          <a href="tool.html?card=physics-unit-converter-matrix">🔄 Universal Unit Matrix</a>
          <span>High-precision bidirectional converter across engineering, data storage, scientific physics, and everyday measurements.</span>
        </li>
        <li>
          <a href="tool.html?card=physics">🔬 Physics Toolkit</a>
          <span>Calculate common physics formulas: motion, forces, energy, and more. Select a formula to begin.</span>
        </li>
        <li>
          <a href="tool.html?card=plant-encyclopedia">🌿 Plant Encyclopedia (Live)</a>
          <span>Comprehensive plant database with real-time data from multiple sources. Search for any plant to get detailed information.</span>
        </li>
        <li>
          <a href="tool.html?card=power-calculator">⚡ Power Calculator</a>
          <span>Calculate electrical power values with multiple calculation modes. ⚠️ Educational purposes only — consult licensed electrician for actual…</span>
        </li>
        <li>
          <a href="tool.html?card=prism-optics-ray-refraction">🌈 Prism Optics & Snell's Law</a>
          <span>Interactive optical bench simulating chromatic dispersion, Snell's law refraction, and total internal reflection (TIR) through a triangul…</span>
        </li>
        <li>
          <a href="tool.html?card=projectile-motion-simulator">🎯 Projectile Motion Simulator</a>
          <span>Simulate parabolic ballistic trajectories in real time across different planetary gravitational fields. Computes flight time, apex altitu…</span>
        </li>
        <li>
          <a href="tool.html?card=psychrometric-dewpoint-analyzer">☁️ Psychrometric & Dew Point</a>
          <span>Analyze atmospheric water vapor psychrometrics using Magnus-Tetens formulas. Calculate exact Dew Point ($T_{dp}$), saturation vapor press…</span>
        </li>
        <li>
          <a href="tool.html?card=quantum-wave-packet-tunneling">⚛️ Quantum Wave Tunneling</a>
          <span>Quantum mechanical wavepacket simulator solving the time-dependent Schrödinger equation across an impenetrable classical potential barrier.</span>
        </li>
        <li>
          <a href="tool.html?card=radioactive-decay-calculator">☢️ Radioactive Decay Lab</a>
          <span>Model exponential nuclear decay, remaining isotope fractions, and radiometric carbon dating via the fundamental decay law $N(t) = N_0 (1/…</span>
        </li>
        <li>
          <a href="tool.html?card=rc-time-constant-calculator">⏲️ RC Time Constant</a>
          <span>τ = R × C. A capacitor charges to ~63% in one τ and ~99% in 5τ. Cut-off of a first-order RC low-pass is fc = 1 / (2πRC). R in ohms, C in…</span>
        </li>
        <li>
          <a href="tool.html?card=reaction-diffusion-turing-patterns">🐆 Turing Reaction Diffusion</a>
          <span>Alan Turing's 1952 morphogenesis simulator. Nonlinear chemical reaction-diffusion equations generating biological spots, stripes, and cor…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-dimensions">📐 Dimensions of Reality</a>
          <span>We live in 3 spatial dimensions — but why 3? Explore what life would be like in 1D, 2D, 4D, and beyond. Each dimension changes the laws o…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-emergence">🌀 Emergence — Simple Rules, Infinite Complexity</a>
          <span>Watch Conway's Game of Life: 4 simple rules create self-replicating patterns, computation, and open-ended complexity from nothing.</span>
        </li>
        <li>
          <a href="tool.html?card=reality-entropy-arrow-of-time">🔄 Entropy & The Arrow of Time</a>
          <span>Why does time only flow forward? Watch entropy increase in real-time as ordered systems dissolve into disorder — the fundamental law that…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-fundamental-constants">🔢 The Constants of Reality</a>
          <span>The universe is governed by a handful of numbers. Change any one of them slightly — and atoms, stars, chemistry, and life cannot exist. W…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-observer-effect">👁️ The Observer Effect</a>
          <span>Does observation change reality? Explore the measurement problem, Schrödinger's cat, and the role of the observer in quantum mechanics.</span>
        </li>
        <li>
          <a href="tool.html?card=reality-quantum-world">⚛️ The Quantum World</a>
          <span>Explore wave-particle duality, superposition, and the measurement problem. Fire particles through slits and watch reality behave impossibly.</span>
        </li>
        <li>
          <a href="tool.html?card=reality-scale-of-reality">🌌 Scale of Reality</a>
          <span>Zoom from the Planck length (10⁻³⁵m) to the observable universe (10²⁷m). Drag the slider to see where you exist in the full scale of real…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-spacetime-curvature">🕳️ Spacetime Curvature</a>
          <span>See how mass warps the fabric of spacetime. Drag the mass slider to watch gravity bend space, slow time, and curve the paths of light.</span>
        </li>
        <li>
          <a href="tool.html?card=reality-universe-timeline">⏳ Timeline of Everything</a>
          <span>From the Big Bang to the heat death of the universe. Slide through 13.8 billion years of cosmic history and see how reality unfolded.</span>
        </li>
        <li>
          <a href="tool.html?card=reality-what-is-consciousness">🧠 What Is Consciousness?</a>
          <span>The hardest problem in science. Explore the mystery of subjective experience — how does matter become aware? Interactive exploration of t…</span>
        </li>
        <li>
          <a href="tool.html?card=reality-why-something-rather-than-nothing">🕳️ Why Is There Something Rather Than Nothing?</a>
          <span>The deepest question philosophy has ever asked. Explore the mystery of existence itself — why does anything exist at all?</span>
        </li>
        <li>
          <a href="tool.html?card=resistor-color-code">🎨 Resistor Color Code</a>
          <span>Decode resistor color bands into resistance values. ⚠️ Educational only — verify with multimeter.</span>
        </li>
        <li>
          <a href="tool.html?card=rf-link-budget-fresnel-planner">📡 RF Link Budget & Fresnel Zone Planner</a>
          <span>Will the link work? Radio needs more than line of sight — it needs a clear ellipse of space around the beam, and the Earth quietly bulges…</span>
        </li>
        <li>
          <a href="tool.html?card=schlier-flow-thermal-shadow">🔥 Schlieren Optics Airflow</a>
          <span>August Toepler's 1864 Schlieren photography system. Visualizes invisible thermal convection plumes and supersonic shockwaves via refracti…</span>
        </li>
        <li>
          <a href="tool.html?card=science-quiz">Science Quiz Generator</a>
          <span>Generate science quiz questions and test your knowledge with fun facts.</span>
        </li>
        <li>
          <a href="tool.html?card=science">🔬 Science Study List</a>
          <span>Build your science study list. Add topics and notes, then test yourself by hiding the notes. Saved locally in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=scientific-method">🔬 Scientific Method Helper</a>
          <span>Work through the scientific method. Enter your experiment idea and generate a structured outline.</span>
        </li>
        <li>
          <a href="tool.html?card=seawater-salinity-density-teos">🌊 Seawater Salinity & Density</a>
          <span>Investigate ocean physics and the thermodynamic equation of seawater (TEOS-10). Calculate in-situ density ($\rho$), freezing point depres…</span>
        </li>
        <li>
          <a href="tool.html?card=seed-germination-calculator">🌱 Seed Germination Calculator</a>
          <span>Predict germination time based on seed type, temperature, and environmental factors using USDA, UC Davis, and university research data. T…</span>
        </li>
        <li>
          <a href="tool.html?card=soil-ph-guide">🌱 Soil & pH Guide</a>
          <span>Soil pH and type determine nutrient availability and plant success. Match plants with their preferred conditions. This tool is supported…</span>
        </li>
        <li>
          <a href="tool.html?card=solar-panel-calculator">☀️ Solar Panel Calculator</a>
          <span>Estimate solar panel requirements for your energy needs. Educational tool only — always consult a professional installer.</span>
        </li>
        <li>
          <a href="tool.html?card=solar-system-simulator">🌌 Solar System Simulator</a>
          <span>Interactive 2D simulation of the Solar System. Adjust time speed and scale, toggle orbits and labels, click planets for details.</span>
        </li>
        <li>
          <a href="tool.html?card=sound-decibel-calculator">🔊 Sound Decibel Calculator</a>
          <span>Calculate sound pressure level (SPL dB) drop over distance using the acoustic inverse-square law $L_2 = L_1 - 20\log_{10}(r_2/r_1)$, acou…</span>
        </li>
        <li>
          <a href="tool.html?card=speaker-ohm-wiring-calculator">🔊 Speaker Ohm Wiring</a>
          <span>Series adds ohms; parallel is the reciprocal sum. Never present an amp with a lower load than it is rated for — that is how output stages…</span>
        </li>
        <li>
          <a href="tool.html?card=special-relativity-calculator">🚀 Special Relativity Simulator</a>
          <span>Calculate relativistic time dilation, length contraction, and kinetic energy via Einstein's Special Relativity equations. Compare spacesh…</span>
        </li>
        <li>
          <a href="tool.html?card=spontaneous-synchronization-kuramoto">🔥 Firefly Kuramoto Synchronization</a>
          <span>Yoshiki Kuramoto's nonlinear synchronization model. Independent bioluminescent fireflies spontaneously phase-lock into simultaneous colle…</span>
        </li>
        <li>
          <a href="tool.html?card=steam-tables-thermodynamics">⚙️ Steam Tables Lab</a>
          <span>Industrial steam table thermodynamics (IAPWS formulation). Calculate saturation pressure ($P_{sat}$), specific enthalpy ($h$), entropy ($…</span>
        </li>
        <li>
          <a href="tool.html?card=stone-pounds-kg-weight-converter">⚖️ Stone, Pounds ⇄ kg</a>
          <span>Convert body weight between stone & pounds, pounds, kilograms and grams. One stone is 14 lb; one avoirdupois pound is exactly 0.45359237 kg.</span>
        </li>
        <li>
          <a href="tool.html?card=subnet-cidr-network-calculator">🌐 Subnet & CIDR Calculator</a>
          <span>Calculate IPv4 subnets, network boundaries, usable host ranges, and binary bit allocation. Essential for cloud VPCs, DevOps, and network…</span>
        </li>
        <li>
          <a href="tool.html?card=tap-drill-size-chart">🔩 Tap Drill Size</a>
          <span>Close-enough tap drill ≈ major diameter − pitch (75% thread). Metric coarse plus a few UNC sizes. For production work use the machinist’s…</span>
        </li>
        <li>
          <a href="tool.html?card=tectonic-plate-drift-calculator">🌋 Tectonic Plate Drift Calculator</a>
          <span>The ground under you is moving right now. Pick a place and its tectonic plate and this rotates it about the plate's Euler pole — the real…</span>
        </li>
        <li>
          <a href="tool.html?card=thermodynamics">🔥 Thermodynamics Calculator</a>
          <span>Calculate heat transfer, efficiency, entropy, and explore thermodynamics principles. Essential tool for physics, engineering, and chemistry.</span>
        </li>
        <li>
          <a href="tool.html?card=tidal-window-crossing-planner">🌊 Tidal Window & Crossing Planner</a>
          <span>Two kinds of people watch the tide: sailors who need enough water under the keel, and everyone crossing a causeway, ford or sandbar who n…</span>
        </li>
        <li>
          <a href="tool.html?card=torsional-vibration-critical-speed">⚡ Torsional Vibration Lab</a>
          <span>Calculate torsional stiffness ($k_t = \frac{GJ}{L}$), natural angular frequencies ($\omega_n = \sqrt{k_t/I}$), and critical whirling RPM…</span>
        </li>
        <li>
          <a href="tool.html?card=tr3b-anti-gravity-flight-calculator">🛸 TR-3B Flight Simulator</a>
          <span>Simulate the theoretical physics of the triangular TR-3B aerospace platform. Calculates Mercury-based Magnetic Field Disruptor (MFD) plas…</span>
        </li>
        <li>
          <a href="tool.html?card=transformer-calculator">⚡ Transformer Sizing Calculator</a>
          <span>Estimate transformer size for electrical loads. ⚠️ EDUCATIONAL ONLY — Always verify with a qualified engineer and local standards.</span>
        </li>
        <li>
          <a href="tool.html?card=underwater-acoustics-sound-speed">🐬 Underwater Acoustics Lab</a>
          <span>Investigate acoustic wave mechanics in water. Calculate high-precision sound velocity ($c \approx 1,482\text{ m/s}$, 4.3× faster than air…</span>
        </li>
        <li>
          <a href="tool.html?card=unit-converter-science">⚛️ Science Unit Converter</a>
          <span>Convert between scientific units — energy, temperature, length, mass, and pressure.</span>
        </li>
        <li>
          <a href="tool.html?card=unit-converter">🔬 Scientific Unit Converter</a>
          <span>Convert between common scientific units — length, mass, temperature, and energy.</span>
        </li>
        <li>
          <a href="tool.html?card=unitconverter">📏 Everyday Unit Converter</a>
          <span>Convert between common units of length, weight, and temperature.</span>
        </li>
        <li>
          <a href="tool.html?card=van-de-graaff-electrostatic-generator">⚡ Van de Graaff Generator</a>
          <span>Electrostatic museum exhibit. Rubber belt triboelectric charge transport accumulates up to 400 kV on the metal dome, firing high-voltage…</span>
        </li>
        <li>
          <a href="tool.html?card=vibration-isolation-transmissibility">🛡️ Vibration Isolator Designer</a>
          <span>Design mechanical vibration isolators and shock mounts using force transmissibility ($T_R$). Calculate required static deflection ($\delt…</span>
        </li>
        <li>
          <a href="tool.html?card=voltage-divider-calculator">⚡ Voltage Divider</a>
          <span>Vout = Vin × R2 / (R1 + R2). R1 is the top resistor from the supply; R2 is the bottom resistor to ground. Unloaded — a low-impedance load…</span>
        </li>
        <li>
          <a href="tool.html?card=voltage-drop">⚡ Voltage Drop Calculator</a>
          <span>Estimate voltage drop across a conductor run. Educational only — always verify with a qualified electrician and local standards.</span>
        </li>
        <li>
          <a href="tool.html?card=water-density-anomaly">💧 Water Density Anomaly Lab</a>
          <span>Investigate water's famous thermodynamic density anomaly ($\rho_{max}$ at $3.98^\circ\text{C}$). Explore negative thermal expansion, the…</span>
        </li>
        <li>
          <a href="tool.html?card=water-dielectric-dipole-relaxation">⚡ Water Dielectric Lab</a>
          <span>Investigate water's molecular dipole moment ($\mu = 1.854\text{ Debye}$) and huge dielectric permittivity ($\epsilon_r \approx 80.1$). Mo…</span>
        </li>
        <li>
          <a href="tool.html?card=water-hardness-langelier-index">🚰 Water Hardness (LSI) Lab</a>
          <span>Assess water hardness and mineral stability using the Langelier Saturation Index ($\text{LSI} = \text{pH} - \text{pH}_s$) and Ryznar Stab…</span>
        </li>
        <li>
          <a href="tool.html?card=water-ion-product-kw-ph">🧪 Water Ionization & pH Lab</a>
          <span>Investigate water's auto-protolysis equilibrium ($2\text{H}_2\text{O} \rightleftharpoons \text{H}_3\text{O}^+ + \text{OH}^-$). Discover w…</span>
        </li>
        <li>
          <a href="tool.html?card=water-phase-diagram">🏔️ Water Phase Diagram Lab</a>
          <span>Navigate water's complete thermodynamic $P$-$T$ phase space across Solid, Liquid, Vapor, and Supercritical regimes. Explore the Triple Po…</span>
        </li>
        <li>
          <a href="tool.html?card=water-surface-tension-capillary">🧪 Water Surface Tension Lab</a>
          <span>Explore water's extraordinary cohesive hydrogen-bond surface tension ($\sigma = 72.86\text{ mN/m}$). Calculate Jurin's Law capillary rise…</span>
        </li>
        <li>
          <a href="tool.html?card=wheelbuilding-spoke-length-calculator">🛞 Wheelbuilding Spoke Length & Tension Calculator</a>
          <span>Spoke length is a three-dimensional problem: the spoke runs from a hole in the hub flange, sideways to the rim centreline and around by h…</span>
        </li>
        <li>
          <a href="tool.html?card=wind-chill-calculator">🌬️ Wind Chill Calculator</a>
          <span>NWS/JAG/TI wind-chill (2001): valid when air is ≤ 10 °C and wind ≥ 4.8 km/h. It estimates how cold exposed skin feels — not a frostbite t…</span>
        </li>
        <li>
          <a href="tool.html?card=wind-triangle-flight-planner">✈️ Wind Triangle & Flight Leg Planner</a>
          <span>Air is a moving floor. Point the nose where you want to go and the wind quietly carries you somewhere else, so every navigation log start…</span>
        </li>
        <li>
          <a href="tool.html?card=wind-wave-fetch-forecaster">🌬️ Wind, Fetch & Wave Forecaster</a>
          <span>Waves are built by three things: how hard the wind blows, how far it blows over open water, and how long it keeps blowing. This works out…</span>
        </li>
        <li>
          <a href="tool.html?card=wire-gauge">⚡ Wire Gauge Calculator</a>
          <span>Professional wire sizing calculator for electrical installations with NEC/IEC compliance checks and safety recommendations.</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="mathematics">
      <h2>📐 Mathematics <span class="count">64 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=age-calculator-exact-days">🎂 Exact Age Calculator (Years, Months, Days)</a>
          <span>Work out your exact age — or the time between any two dates — in years, months, weeks, days, hours, minutes and seconds. Shows your next…</span>
        </li>
        <li>
          <a href="tool.html?card=age-calculator-exact">🎂 Exact Age Calculator</a>
          <span>Get your exact age in years, months, days and hours, plus the weekday you were born, your next birthday countdown and Western zodiac. Use…</span>
        </li>
        <li>
          <a href="tool.html?card=age-calculator">🎂 Age Calculator</a>
          <span>Your exact age in years, months and days — plus total days lived, next birthday countdown and 10,000-day milestones.</span>
        </li>
        <li>
          <a href="tool.html?card=algebra">Algebra Solver</a>
          <span>Solve equations instantly. Type any equation and click Solve.</span>
        </li>
        <li>
          <a href="tool.html?card=calculus">Calculus Helper</a>
          <span>Work with derivatives and integrals. Enter a function of x, choose operation, and generate step‑by‑step results.</span>
        </li>
        <li>
          <a href="tool.html?card=clock-angle-calculator">🕐 Clock Angle Calculator</a>
          <span>Angle between hour and minute hands. Minute hand = 6° × minutes. Hour hand = 0.5° × (60×hours + minutes). The smaller angle is min(θ, 360…</span>
        </li>
        <li>
          <a href="tool.html?card=clock-reading-trainer">🕰️ Clock Reading & Telling Time Trainer</a>
          <span>Read the hands, set the clock yourself, and work out elapsed time — three modes, five questions each, with instant feedback. The clock is…</span>
        </li>
        <li>
          <a href="tool.html?card=complex-numbers">🧮 Complex Numbers Calculator</a>
          <span>Perform operations with complex numbers in rectangular (a+bi) and polar (r∠θ) forms. Visualize results on the complex plane with step-by-…</span>
        </li>
        <li>
          <a href="tool.html?card=discrete-math">🧮 Discrete Math Toolkit</a>
          <span>WORKING CALCULATOR for Computer Science & Mathematics. Real calculations for set theory, combinatorics, and logic. Everything works insta…</span>
        </li>
        <li>
          <a href="tool.html?card=edu-math-3d">📐 3D Function Plotter</a>
          <span>Visualize 3D mathematical surfaces — rotate, zoom, and explore equations in real time</span>
        </li>
        <li>
          <a href="tool.html?card=equation-solver">📐 Equation Solver</a>
          <span>Solve algebraic equations step-by-step. Supports linear, quadratic, and cubic equations. Try examples below!</span>
        </li>
        <li>
          <a href="tool.html?card=exam-prep-maths">📚 Exam Prep - Mathematics</a>
          <span>COMPLETE MATH PREP - Generate practice problems with step-by-step solutions. Track your progress across 500+ questions covering all major…</span>
        </li>
        <li>
          <a href="tool.html?card=exponents">⚡ Exponents & Roots Calculator</a>
          <span>Calculate powers, roots, and exponential functions with detailed steps and visualizations. Perfect for students learning algebra and calc…</span>
        </li>
        <li>
          <a href="tool.html?card=factors-multiples-trainer">🔢 Factors & Multiples Trainer</a>
          <span>List the factors and multiples of any number, then practise finding the highest common factor, lowest common multiple and factor/multiple…</span>
        </li>
        <li>
          <a href="tool.html?card=formula-library">📚 Scientific Formula Library</a>
          <span>Interactive scientific formula calculator with detailed explanations, 3D visualizations, and step-by-step solutions. Perfect for students…</span>
        </li>
        <li>
          <a href="tool.html?card=fractions">🔢 Fractions Calculator & Visualizer</a>
          <span>Master fractions with calculations, visual representations, and step-by-step explanations. Perfect for students learning fractions!</span>
        </li>
        <li>
          <a href="tool.html?card=function-terrain-3d-explorer">⛰️ Function Terrain 3D Explorer</a>
          <span>Type any z = f(x, y) formula and watch it become a spinning 3D mountain range. Safe built-in math parser (no eval), orbit/zoom controls…</span>
        </li>
        <li>
          <a href="tool.html?card=gcf-lcm-prime-factor-calculator">🧮 GCF, LCM & Prime Factors</a>
          <span>Find the greatest common factor, least common multiple and prime factorisation of one or more integers. Euclidean algorithm for GCF; tria…</span>
        </li>
        <li>
          <a href="tool.html?card=geometry">Geometry Calculator</a>
          <span>Calculate areas, perimeters, and volumes for common shapes. Choose a shape, enter dimensions, and get results with formulas shown.</span>
        </li>
        <li>
          <a href="tool.html?card=gpa">🌍 International GPA Calculator</a>
          <span>Calculate GPA for universities worldwide. Supports multiple grading systems and conversions.</span>
        </li>
        <li>
          <a href="tool.html?card=grade">Grade Calculator 📊</a>
          <span>Calculate weighted grades, predict final scores, and see what you need to achieve your target grade.</span>
        </li>
        <li>
          <a href="tool.html?card=gradeweight">📊 Weighted Grade Calculator</a>
          <span>Enter your assignments with weights and scores to calculate your final grade.</span>
        </li>
        <li>
          <a href="tool.html?card=graphing-calculator">🌐 Smart Graphing Calculator</a>
          <span>Interactive math visualization: Plot functions, find roots, compute derivatives/integrals, solve equations, and create beautiful graphs…</span>
        </li>
        <li>
          <a href="tool.html?card=hex-decimal">🔢 Hex & Decimal Converter</a>
          <span>Convert between hexadecimal, decimal, binary, octal, and ASCII with bitwise operations. Essential for developers, modders, and reverse en…</span>
        </li>
        <li>
          <a href="tool.html?card=klein-bottle-mobius-lab">🌀 Klein Bottle & Möbius Lab</a>
          <span>Surfaces that shouldn't exist: a Möbius strip with adjustable twists, a Klein bottle (inside IS outside), and torus knots you design with…</span>
        </li>
        <li>
          <a href="tool.html?card=linear-algebra">Linear Algebra Helper</a>
          <span>Perform comprehensive linear algebra operations with step-by-step solutions, matrix visualization, and educational explanations.</span>
        </li>
        <li>
          <a href="tool.html?card=logarithms">📉 Logarithm Calculator</a>
          <span>Evaluate logarithms in any base, convert between bases, and solve for an unknown exponent. Shows the change-of-base working so you can fo…</span>
        </li>
        <li>
          <a href="tool.html?card=long-division-trainer">➗ Long Division Step-by-Step Trainer</a>
          <span>See every step of long division — divide, multiply, subtract, bring down — then practise on a generated calculation with full remainder a…</span>
        </li>
        <li>
          <a href="tool.html?card=math-practice">🐚 Fibonacci & Special Sequences</a>
          <span>Calculate arithmetic and geometric sequences and series. Includes step-by-step solutions and visual representations.</span>
        </li>
        <li>
          <a href="tool.html?card=math-universe-explorer">🌌 Math Universe Explorer</a>
          <span>Step beyond calculation into mathematical discovery. Visualize concepts, see proofs unfold, find connections humans have never seen.</span>
        </li>
        <li>
          <a href="tool.html?card=maths-flashcards">🧮 Maths Flashcards</a>
          <span>Generate random maths flashcards for quick practice. Perfect for studying, teaching, or mental math warm-ups. 🎯 Interactive • Timed pract…</span>
        </li>
        <li>
          <a href="tool.html?card=maths">Math Helper</a>
          <span>Solve mathematical expressions, equations, and practice calculations. Supports arithmetic, algebra, trigonometry, and more!</span>
        </li>
        <li>
          <a href="tool.html?card=matrices">Matrices Calculator</a>
          <span>Perform matrix operations: addition, multiplication, determinant, inverse, transpose, and more. Supports up to 4x4 matrices with visual f…</span>
        </li>
        <li>
          <a href="tool.html?card=mean-median-mode-stdev">📊 Mean, Median, Mode & Std Dev</a>
          <span>Paste numbers separated by commas, spaces or new lines. Sample standard deviation uses n − 1 (Bessel); population uses n. Mode lists ever…</span>
        </li>
        <li>
          <a href="tool.html?card=mean-median-mode-trainer">📊 Mean, Median, Mode & Range Trainer</a>
          <span>Work out the mean, median, mode and range of a data set, see the full working, and learn when each average is the right tool. 5 rounds, i…</span>
        </li>
        <li>
          <a href="tool.html?card=mental-math-sprint-trainer">🧮 Mental-Math Sprint</a>
          <span>A 60-second arithmetic workout with three difficulty levels, streak bonuses and a review of every question you missed. Sharpens everyday…</span>
        </li>
        <li>
          <a href="tool.html?card=number-theory">🧮 Advanced Number Theory Toolkit</a>
          <span>Comprehensive number theory laboratory: Explore prime numbers, factorization, modular arithmetic, sequences, and advanced mathematical pr…</span>
        </li>
        <li>
          <a href="tool.html?card=order-of-operations-bodmas-trainer">🧠 BODMAS Step-by-Step Trainer</a>
          <span>Type any expression and see it solved one operation at a time with the reason for each step — no calculator tricks, no guessing. Then tak…</span>
        </li>
        <li>
          <a href="tool.html?card=percentage-change-calculator">📊 Percentage Change Calculator</a>
          <span>Work out the percentage increase or decrease between two numbers, plus reverse percentages and a worked price-change example.</span>
        </li>
        <li>
          <a href="tool.html?card=percentages">📊 Advanced Percentages Explorer</a>
          <span>Master percentages with advanced calculations, visualizations, and real-world applications. From basic math to financial analysis!</span>
        </li>
        <li>
          <a href="tool.html?card=prime-factorisation-trainer">🧮 Prime Factorisation Trainer</a>
          <span>Break any number into its prime factors with a full working ladder, learn the divisibility rules, then practise finding the next prime fa…</span>
        </li>
        <li>
          <a href="tool.html?card=prime-number-checker">🔢 Prime Number Checker</a>
          <span>Test whether n is prime, list its prime factors, and jump to the next prime. Trial division up to √n — fine for integers up to about 10¹²…</span>
        </li>
        <li>
          <a href="tool.html?card=probability-paradox-lab">🎲 Probability Paradox Lab</a>
          <span>Your gut feeling about chance is usually wrong — prove it to yourself. Simulate the Monty Hall problem, the birthday paradox and coin-fli…</span>
        </li>
        <li>
          <a href="tool.html?card=probability">🎲 Probability Calculator</a>
          <span>Calculate probabilities for dice, cards, distributions, and real-world scenarios.</span>
        </li>
        <li>
          <a href="tool.html?card=pythagoras-calculator">📐 Pythagoras Calculator</a>
          <span>Find the missing side of a right-angled triangle with the Pythagorean theorem — plus the area, perimeter and both acute angles.</span>
        </li>
        <li>
          <a href="tool.html?card=pythagoras-triangle-solver">△ Pythagoras Triangle Solver</a>
          <span>Right-angled triangle: a² + b² = c². Leave one side blank (or 0) and it is solved. Optional acute angle (degrees) uses SOH-CAH-TOA with t…</span>
        </li>
        <li>
          <a href="tool.html?card=quadratic-equation-solver">𝑥² Quadratic Equation Solver</a>
          <span>Roots of ax² + bx + c = 0 via the discriminant Δ = b² − 4ac. Complex roots are shown as a ± bi. Coefficients can be any real numbers, wit…</span>
        </li>
        <li>
          <a href="tool.html?card=quadratic-solver">🧮 Quadratic Equation Solver</a>
          <span>Solve ax² + bx + c = 0 with the quadratic formula — real or complex roots, with every step shown.</span>
        </li>
        <li>
          <a href="tool.html?card=radians-degrees-converter">∠ Radians ⇄ Degrees Converter</a>
          <span>π rad = 180°. Also shows revolutions and a reduced π-fraction when it is close to a simple multiple of π.</span>
        </li>
        <li>
          <a href="tool.html?card=ratio-proportion-calculator">➗ Ratio & Proportion</a>
          <span>Solve a/b = c/d for the blank, simplify a ratio, and scale a recipe-style mix. Leave exactly one of A, B, C, D empty. Cross-multiply: A ×…</span>
        </li>
        <li>
          <a href="tool.html?card=roman-numeral-converter">🏛️ Roman Numeral Converter</a>
          <span>Convert numbers to Roman numerals and back, with a step-by-step breakdown of how each numeral is built. Handles 1–3,999 in standard notat…</span>
        </li>
        <li>
          <a href="tool.html?card=roman-numeral-number-converter">🏛️ Roman Numeral & Number Base Converter</a>
          <span>Convert any number to Roman numerals (with overline notation for 4,000+), binary, octal, hexadecimal, base-36, words, ordinal and scienti…</span>
        </li>
        <li>
          <a href="tool.html?card=rounding-estimation-trainer">🔄 Rounding & Estimation Trainer</a>
          <span>Master rounding rules and quick estimation. Round any number to a chosen place, then estimate answers to real-life word problems with 5-r…</span>
        </li>
        <li>
          <a href="tool.html?card=scientific-calculator">🧮 Scientific Calculator</a>
          <span>Full-featured scientific calculator with trigonometry, logarithms, powers, and memory functions. Works offline.</span>
        </li>
        <li>
          <a href="tool.html?card=scientific-notation-sigfig-calculator">🔬 Scientific Notation & Sig Figs</a>
          <span>Convert a number to scientific / engineering notation and round to significant figures. 1.23 × 10⁴ is 12300. Trailing zeros in 1000 are a…</span>
        </li>
        <li>
          <a href="tool.html?card=sequences-series">🔢 Sequences & Series Calculator</a>
          <span>Find any term and the running sum of arithmetic or geometric sequences, test a geometric series for convergence, and see the working for…</span>
        </li>
        <li>
          <a href="tool.html?card=speed-distance-time-calculator">🚗 Speed Distance Time Calculator</a>
          <span>Fill in any two of speed, distance and time; the third is calculated. Swap units without changing the physics: metres, kilometres, miles…</span>
        </li>
        <li>
          <a href="tool.html?card=sphere-cylinder-cone-volume">⚪ Sphere, Cylinder & Cone Volume</a>
          <span>V_sphere = 4/3 π r³, A = 4 π r². Cylinder π r² h. Cone (1/3) π r² h. Enter radius and height in the same units; volume comes out in those…</span>
        </li>
        <li>
          <a href="tool.html?card=statistics">📊 Statistics Calculator</a>
          <span>Comprehensive statistical analysis tool with descriptive statistics, probability distributions, hypothesis testing, and data visualizatio…</span>
        </li>
        <li>
          <a href="tool.html?card=text-statistics">📊 Text Statistics Analyzer</a>
          <span>Comprehensive text analysis: word count, character count, sentence count, reading time, readability score, and more.</span>
        </li>
        <li>
          <a href="tool.html?card=times-tables-drill-trainer">🔢 Times Tables Drill Trainer</a>
          <span>Drill the 1–12 times tables with instant feedback, streak tracking and a review of the facts you get wrong. Includes a full 12×12 grid an…</span>
        </li>
        <li>
          <a href="tool.html?card=trigonometry">🎯 Foundation & Unit Circle</a>
          <span>Sin = Opposite / Hypotenuse Cos = Adjacent / Hypotenuse Tan = Opposite / Adjacent</span>
        </li>
        <li>
          <a href="tool.html?card=venn-diagram-visualiser">🔵 Venn Diagram Visualiser</a>
          <span>Type two lists and watch the Venn diagram draw itself — union, intersection, symmetric difference and per-zone items are listed.</span>
        </li>
        <li>
          <a href="tool.html?card=youth-gpa-calculator">📊 GPA Calculator</a>
          <span>Calculate your GPA, track grades, and see what you need to hit your target — supports US, UK, and percentage systems</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="music-and-audio">
      <h2>🎵 Music & Audio <span class="count">27 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=audio-bpm-tapper">🥁 Beat BPM Tapper</a>
          <span>Tap to the rhythm of any track or beat. Calculates exact BPM, musical delay times in milliseconds, reverb pre-delay values, and audio fre…</span>
        </li>
        <li>
          <a href="tool.html?card=audio-tone-frequency-generator">🎚️ Audio Tone Generator</a>
          <span>Generate pure acoustic tones, test speaker frequency responses, and monitor live audio waveforms using the Web Audio API.</span>
        </li>
        <li>
          <a href="tool.html?card=binaural-neuro-tuner">🧠 Binaural Neuro Tuner</a>
          <span>Generate scientifically tuned binaural beats and isochronic frequencies using pure Web Audio synthesis. Entrain your brainwaves for laser…</span>
        </li>
        <li>
          <a href="tool.html?card=bpm-counter">BPM Tap Counter (Pro)</a>
          <span>Instant, free online BPM Tap Counter (Pro) tool. No signup required.</span>
        </li>
        <li>
          <a href="tool.html?card=capo-calculator">🎸 Capo Calculator</a>
          <span>Find capo placement for key transposition, chord conversion, and song adaptation. Supports sharps/flats, multiple fret options, and tunin…</span>
        </li>
        <li>
          <a href="tool.html?card=carol-karaoke">🎵 Christmas Carol Karaoke Machine</a>
          <span>Sing along to Christmas classics with synchronized lyrics, pitch detection, and festive backgrounds! 🎤 Features: 50+ carols, pitch meter…</span>
        </li>
        <li>
          <a href="tool.html?card=chord-finder">🎵 Chord Finder</a>
          <span>Identify chords from selected notes. Perfect for songwriters and beginners!</span>
        </li>
        <li>
          <a href="tool.html?card=chord-progression">🎼 Chord Progression Builder</a>
          <span>Build, analyze, and explore chord progressions for songwriting. Perfect for musicians and composers!</span>
        </li>
        <li>
          <a href="tool.html?card=delay-time-bpm-calculator">🎛️ Delay Time BPM Calculator</a>
          <span>Convert tempo to delay, reverb pre-delay and LFO times. Note length in milliseconds = 240,000 ÷ BPM ÷ denominator (crotchet = 4). Dotted…</span>
        </li>
        <li>
          <a href="tool.html?card=ear-trainer">🎵 Ear Trainer</a>
          <span>Practice recognizing musical intervals with visual guides. ⚠️ For educational purposes — always verify with professional resources.</span>
        </li>
        <li>
          <a href="tool.html?card=edu-music-theory">🎵 Music Theory Visualizer</a>
          <span>Explore scales, chords, and intervals on a virtual piano — hear how they sound and see the theory behind them</span>
        </li>
        <li>
          <a href="tool.html?card=guitar-fret-calculator">🎸 Guitar Fret Position Calculator</a>
          <span>Equal-temperament fret rule: distance from nut to fret n = L × (1 − 1/2^(n/12)) where L is scale length. 12th fret is the octave (halfway…</span>
        </li>
        <li>
          <a href="tool.html?card=instrument-care">🎶 Instrument Care Guide</a>
          <span>Get detailed care instructions with maintenance schedules, required tools, and professional tips for your specific instrument.</span>
        </li>
        <li>
          <a href="tool.html?card=interval-trainer">🎵 Interval Ear Trainer</a>
          <span>Essential for musicians: Learn to identify intervals by ear. Perfect for singers, composers, and anyone learning music theory!</span>
        </li>
        <li>
          <a href="tool.html?card=metronome">🎵 Professional Metronome</a>
          <span>Precise audible & visual metronome with subdivisions, tap tempo, and tempo presets. ⚠️ Enable sound in your browser</span>
        </li>
        <li>
          <a href="tool.html?card=music-quiz">🎵 Ultimate Music Quiz</a>
          <span>Interactive music knowledge challenge: Test your expertise across theory, history, instruments, and pop culture. Complete with scoring, e…</span>
        </li>
        <li>
          <a href="tool.html?card=music-theory">🎼 Circle of Fifths Explorer</a>
          <span>Pick any key to see its relative minor, the closely related keys either side of it on the circle, and the seven diatonic chords built fro…</span>
        </li>
        <li>
          <a href="tool.html?card=note-frequency-calculator">🎹 Note Frequency Calculator</a>
          <span>12-tone equal temperament: f = f₀ × 2^(n/12). Default A4 = 440 Hz. MIDI note 69 is A4. Period = 1/f.</span>
        </li>
        <li>
          <a href="tool.html?card=recording-basics">🎤 Recording Basics</a>
          <span>Learn fundamental recording techniques. ⚠️ Educational only — always verify with professional resources.</span>
        </li>
        <li>
          <a href="tool.html?card=rhythm-generator">🥁 Rhythm Generator</a>
          <span>Generate rhythm patterns for practice and composition. ⚠️ Educational only — verify with professional resources.</span>
        </li>
        <li>
          <a href="tool.html?card=scale-trainer">🎹 Scale Trainer</a>
          <span>Practice scales in different keys. Educational only — always verify with a music teacher or professional resource.</span>
        </li>
        <li>
          <a href="tool.html?card=sheet-music">🎼 Sheet Music Reference Generator</a>
          <span>Generate detailed sheet music references with proper notation guidance. ⚠️ Educational only — always verify with a teacher or professiona…</span>
        </li>
        <li>
          <a href="tool.html?card=song-writer">🎵 Song Writer (General Advice)</a>
          <span>Brainstorm song ideas, lyrics, and structure. ⚠️ Educational only — always verify with a teacher or professional resource.</span>
        </li>
        <li>
          <a href="tool.html?card=tempo-map">🎵 Tempo & BPM Map</a>
          <span>Create tempo maps for musical compositions with BPM calculations and time conversions. Educational tool for musicians and composers.</span>
        </li>
        <li>
          <a href="tool.html?card=transposer">🎵 Music Transposer</a>
          <span>Transpose chords, melodies, and entire progressions between keys. ⚠️ EDUCATIONAL TOOL — Verify with music teacher or professional resources.</span>
        </li>
        <li>
          <a href="tool.html?card=tuner">🎸 Instrument Tuner Reference</a>
          <span>Reference notes for tuning your instrument. Educational only — verify with your ear or a professional tuner.</span>
        </li>
        <li>
          <a href="tool.html?card=youtube-dj">🎛️ YouTube DJ Mixer</a>
          <span>Mix YouTube videos live like a professional DJ. Crossfade between tracks, apply effects, and create seamless mixes. 🎧 Live mixing • Cross…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="health-and-fitness">
      <h2>💪 Health & Fitness <span class="count">39 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=a1c-average-glucose-converter">🩸 HbA1c ⇄ Average Glucose</a>
          <span>Convert HbA1c (%) to estimated average glucose with the NGSP/DCCT formula (eAG mg/dL = 28.7 × A1c − 46.7). Educational only — lab methods…</span>
        </li>
        <li>
          <a href="tool.html?card=baby-formula-mixing-calculator">🍼 Baby Formula Mixing</a>
          <span>Most UK powders use 1 level scoop per 30 ml of water (check the tin). Water first, then powder. This is arithmetic — NHS mixing and steri…</span>
        </li>
        <li>
          <a href="tool.html?card=baby-sleep-planner">🍼 Baby Sleep & Feeding Day Planner</a>
          <span>Babies run on wake windows — how long they can stay awake before they need to sleep again. It changes fast in the first year and getting…</span>
        </li>
        <li>
          <a href="tool.html?card=blood-pressure-category-guide">🩺 Blood Pressure Category Guide</a>
          <span>Home-monitor numbers compared with NHS adult clinic bands (and a note on AHA). One reading is not a diagnosis. Seek urgent help for chest…</span>
        </li>
        <li>
          <a href="tool.html?card=bmi">⚕️ BMI Calculator</a>
          <span>Calculate your Body Mass Index (BMI) with accurate WHO classification. BMI is a simple screening tool for weight categories that may lead…</span>
        </li>
        <li>
          <a href="tool.html?card=bmr">🔥 BMR & TDEE Calculator</a>
          <span>Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using scientifically validated formulas.</span>
        </li>
        <li>
          <a href="tool.html?card=body-surface-area-calculator">🧍 Body Surface Area Calculator</a>
          <span>Estimate body surface area with Mosteller, Du Bois and Haycock formulae from height and weight. Used for some drug doses and cardiac inde…</span>
        </li>
        <li>
          <a href="tool.html?card=bodyfat">🏋️ Body Fat Calculator</a>
          <span>Estimate your body fat percentage using the U.S. Navy method and understand your fitness level.</span>
        </li>
        <li>
          <a href="tool.html?card=calorie-deficit-weight-loss-timeline">📉 Calorie Deficit Timeline</a>
          <span>Rough weeks to a goal weight from a daily calorie deficit. Uses ~7,700 kcal per kg (about 3,500 kcal per lb). Real bodies adapt — this is…</span>
        </li>
        <li>
          <a href="tool.html?card=calorie">Calorie Calculator</a>
          <span>Estimate daily calorie needs with BMR calculation, weight goals, and macronutrient breakdown. Auto-saves profiles for quick access.</span>
        </li>
        <li>
          <a href="tool.html?card=childgrowth">Child Growth Tracker</a>
          <span>Track your child's growth, compare with WHO percentiles, and monitor development milestones.</span>
        </li>
        <li>
          <a href="tool.html?card=crisis-offline-triage">🆘 Crisis Triage Guide</a>
          <span>100% offline emergency triage protocols, acoustic CPR rhythm metronome, water survival calculator, and optical SOS distress beacon. Opera…</span>
        </li>
        <li>
          <a href="tool.html?card=fitnesscore">🏃‍♂️ Fitness Score Analyzer</a>
          <span>Calculate your comprehensive fitness score with detailed insights and personalized recommendations. Based on scientific health metrics an…</span>
        </li>
        <li>
          <a href="tool.html?card=heartrate">❤️ Heart Rate Zones Calculator</a>
          <span>Calculate training zones, VO₂ max estimates, heart rate variability (HRV), and recovery metrics. Professional-grade analytics for athletes!</span>
        </li>
        <li>
          <a href="tool.html?card=hydration">💧 Daily Hydration Calculator</a>
          <span>Calculate your personalized daily water intake needs. Track your progress throughout the day!</span>
        </li>
        <li>
          <a href="tool.html?card=idealweight">⚖️ Ideal Weight & BMI</a>
          <span>Get a comprehensive analysis of your ideal weight range using multiple scientific formulas and personalized factors.</span>
        </li>
        <li>
          <a href="tool.html?card=intermittent-fasting-window-planner">⏳ Intermittent Fasting Window</a>
          <span>Pick a 16:8, 18:6, 20:4 or custom fast and see today’s eat-from / eat-until times. Educational scheduling only — not medical advice, and…</span>
        </li>
        <li>
          <a href="tool.html?card=karvonen-heart-rate-zones">❤️ Karvonen Heart Rate Zones</a>
          <span>Target HR = ((HRmax − HRrest) × intensity) + HRrest. HRmax default is 220 − age (a rough estimate). Zones are training labels, not medica…</span>
        </li>
        <li>
          <a href="tool.html?card=leanbodymass">Lean Body Mass Calculator</a>
          <span>Estimate your lean body mass using multiple formulas and get detailed body composition analysis.</span>
        </li>
        <li>
          <a href="tool.html?card=macros">🥗 Smart Macros Calculator</a>
          <span>🏋️ Achieve your goals: Calculate protein, carbs, and fats for weight loss, muscle gain, or maintenance. Get personalized meal plans and f…</span>
        </li>
        <li>
          <a href="tool.html?card=mean-arterial-pressure-calculator">❤️ Mean Arterial Pressure</a>
          <span>MAP ≈ (systolic + 2 × diastolic) / 3, plus pulse pressure. A resting MAP near 70–100 mmHg is often cited as adequate organ perfusion. Thi…</span>
        </li>
        <li>
          <a href="tool.html?card=metabolicage">⚡ Metabolic Age Estimator</a>
          <span>Estimate your metabolic age based on your Basal Metabolic Rate (BMR) compared to population averages. 💡 Lower metabolic age indicates bet…</span>
        </li>
        <li>
          <a href="tool.html?card=onerepmax">🏋️ One-Rep Max Calculator</a>
          <span>Instantly estimate your maximum lifting capacity across multiple formulas.</span>
        </li>
        <li>
          <a href="tool.html?card=ovulation-fertile-window-calculator">🌸 Ovulation & Fertile Window</a>
          <span>Estimate ovulation and the fertile window from the first day of your last period and your typical cycle length. Sperm can survive up to f…</span>
        </li>
        <li>
          <a href="tool.html?card=pregnancy-due-date-calculator">🤰 Pregnancy Due Date Calculator</a>
          <span>Estimate a due date with Naegele’s rule from the last menstrual period, or work backwards from a known due date. Shows gestational week…</span>
        </li>
        <li>
          <a href="tool.html?card=pregnancy-due-date-week-calculator">🤰 Pregnancy Due Date & Week-by-Week Calculator</a>
          <span>Estimate your due date from the first day of your last period, conception date, IVF transfer or a scan-dated due date. See how many weeks…</span>
        </li>
        <li>
          <a href="tool.html?card=pregnancy-weight-gain-guide">🤰 Pregnancy Weight Gain Guide</a>
          <span>IOM/NAM ranges by pre-pregnancy BMI for a singleton: underweight 12.5–18 kg, healthy 11.5–16 kg, overweight 7–11.5 kg, obese 5–9 kg. A sk…</span>
        </li>
        <li>
          <a href="tool.html?card=protein-daily-intake-calculator">🥩 Daily Protein Intake</a>
          <span>Estimate a daily protein target from body weight and how hard you train. Sedentary adults often sit near 0.8 g/kg; strength athletes comm…</span>
        </li>
        <li>
          <a href="tool.html?card=qtc-heart-interval-calculator">❤️ QTc Interval (Bazett)</a>
          <span>QTc (Bazett) = QT ÷ √(RR), with RR = 60 / heart-rate. Also shows Fridericia (QT ÷ RR⅓). Educational arithmetic from numbers you type — no…</span>
        </li>
        <li>
          <a href="tool.html?card=sleep">🛏️ Sleep Cycle Calculator</a>
          <span>Calculate optimal wake-up times based on 90-minute sleep cycles for better rest. No affiliate links - this site is supported by user cont…</span>
        </li>
        <li>
          <a href="tool.html?card=steps">🚶 Steps to Calories Converter</a>
          <span>Convert steps walked to calories burned with precision. Calculate energy expenditure based on steps, weight, and walking pace. See equiva…</span>
        </li>
        <li>
          <a href="tool.html?card=tabata-interval-timer">🔥 Tabata Timer</a>
          <span>Classic Tabata is 8 rounds of 20 s work / 10 s rest (4 minutes). Phone speakers optional. If you prefer reduced motion, the digits still…</span>
        </li>
        <li>
          <a href="tool.html?card=targetheartrate">❤️ Target Heart Rate Calculator</a>
          <span>Calculate your optimal heart rate zones for effective exercise training. Based on American Heart Association guidelines.</span>
        </li>
        <li>
          <a href="tool.html?card=tdee">⚡ TDEE & Calorie Calculator</a>
          <span>Calculate your Total Daily Energy Expenditure (TDEE) and calorie needs for weight goals. Based on Mifflin-St Jeor equation.</span>
        </li>
        <li>
          <a href="tool.html?card=uk-alcohol-units-calculator">🍺 UK Alcohol Units Calculator</a>
          <span>UK units = ABV (%) × volume (ml) ÷ 1,000. The NHS low-risk guideline is 14 units a week, spread out, with several drink-free days. This i…</span>
        </li>
        <li>
          <a href="tool.html?card=vo2max">🏃 VO₂ Max Calculator</a>
          <span>Estimate your VO₂ Max — a measure of aerobic fitness. The higher the value, the better your cardiovascular endurance.</span>
        </li>
        <li>
          <a href="tool.html?card=waist-to-height-ratio">📏 Waist-to-Height Ratio</a>
          <span>NICE NG246 uses waist ÷ height as a central-adiposity screen for adults with BMI under 35. Measure the waist at the midpoint between the…</span>
        </li>
        <li>
          <a href="tool.html?card=waisthip">📏 Waist-to-Hip Ratio Calculator</a>
          <span>Calculate your waist-to-hip ratio and see your health risk category based on WHO guidelines.</span>
        </li>
        <li>
          <a href="tool.html?card=waterintake">💧 Daily Water Intake Calculator</a>
          <span>Estimate how much water you should drink each day based on your weight and activity level.</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="sports">
      <h2>🏅 Sports <span class="count">54 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=archery-score-calculator">🎯 Archery Score Calculator</a>
          <span>Tap the value of each arrow as you shoot and this keeps the running total, your Xs and 10s, and how far through the round you are — the w…</span>
        </li>
        <li>
          <a href="tool.html?card=athletics-decathlon-points-calculator">🥇 Athletics Decathlon & Heptathlon Points</a>
          <span>The official World Athletics scoring tables: type a performance in any event and get its points, then watch the total build toward a worl…</span>
        </li>
        <li>
          <a href="tool.html?card=badminton-scorekeeper">🏸 Badminton Match Scorer</a>
          <span>Rally scoring to 21, win by two — but a game can only go to 30. Tap a side to add their point and this handles the deuce, the game win, a…</span>
        </li>
        <li>
          <a href="tool.html?card=baseball-stats-calculator">⚾ Baseball Stats Calculator</a>
          <span>The slash line every hitter lives by — batting average, on-base and slugging, plus OPS — and the pitching numbers (ERA and WHIP). Enter a…</span>
        </li>
        <li>
          <a href="tool.html?card=basketball-efficiency-calculator">🏀 Basketball Efficiency Calculator</a>
          <span>Type in a box score and get the metrics the analysts use: Game Score, effective and true shooting percentage, points per shot and assist-…</span>
        </li>
        <li>
          <a href="tool.html?card=betting-odds-each-way-calculator">🎰 Betting Odds & Each-Way Calculator</a>
          <span>Work out fractional odds as a decimal and a probability, and see exactly what an each-way bet returns — whether your horse wins, only pla…</span>
        </li>
        <li>
          <a href="tool.html?card=bike-gear-calculator">🚴 Bike Gear, Cadence & Speed Calculator</a>
          <span>Works out what every gear on your bike actually does — how far one pedal turn takes you, what speed you will be doing at a given cadence…</span>
        </li>
        <li>
          <a href="tool.html?card=bouldering-score-calculator">🧗 Bouldering Score Comparison</a>
          <span>In bouldering, tops beat everything. Enter two climbers' results and this applies the ranking order — most tops, then fewest attempts to…</span>
        </li>
        <li>
          <a href="tool.html?card=bowling-score-calculator">🎳 Ten-Pin Bowling Score Calculator</a>
          <span>Enter the pinfall for each roll and this scores the game for you — strikes and spares with the bonuses, and the tenth frame's extra balls…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-fight-decision-predictor">📊 Boxing Fight Outcome Projector</a>
          <span>Mid-fight maths for fans and cornermen. Enter the score so far and see exactly what each fighter needs in the remaining rounds — includin…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-judge-criteria-trainer">⚖️ Boxing Judging Criteria Weigher</a>
          <span>Score a single round against the four official criteria — clean punching, effective aggression, ring generalship and defence — in their c…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-knockdown-count-rules">🛎️ Boxing Knockdown & Count Rules Assistant</a>
          <span>Work out whether an incident is a scoring knockdown or a slip, how the count runs, and what it does to the round score. Includes a live c…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-punch-stat-tracker">👊 Boxing Punch Stat Tracker</a>
          <span>Live compubox-style punch counter. Tap as you watch to log jabs and power shots landed or thrown, and get instant connect percentages plu…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-round-by-round-analyzer">📈 Boxing Momentum & Swing Round Analyser</a>
          <span>Paste a completed card and see the shape of the fight — momentum swings, the longest run of rounds, who finished stronger, and which roun…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-round-timer-bell">🔔 Boxing Round Timer & Bell</a>
          <span>Full bout timer with authentic bell and ten-second clapper, generated live in your browser. Configure round length, rest interval and rou…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-scorecard-comparator">🔍 Boxing Scorecard Comparator</a>
          <span>Compare your card against the official judges round by round. Highlights exactly where you disagreed, measures your agreement rate, and f…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-ten-point-must-scorecard">🥊 Boxing 10-Point Must Scorecard</a>
          <span>Score a fight round by round using the official 10-Point Must System. Knockdowns and point deductions are applied automatically, with a l…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-three-judge-simulator">👨‍⚖️ Boxing Three-Judge Decision Simulator</a>
          <span>Enter three official cards and get the correct verdict — unanimous, split, majority, or draw. Handles every decision type including the f…</span>
        </li>
        <li>
          <a href="tool.html?card=boxing-weight-class-checker">⚖️ Boxing Weight Class & Weigh-In Checker</a>
          <span>Find the correct division for any weight, check whether a fighter has made the limit, and see rehydration-clause and catchweight implicat…</span>
        </li>
        <li>
          <a href="tool.html?card=chess-elo-rating-calculator">♟️ Chess Elo Rating Calculator</a>
          <span>See what a single game does to a rating. Enter both players' ratings and the result, and this gives the expected score, the exact rating…</span>
        </li>
        <li>
          <a href="tool.html?card=cricket-chase-calculator">🏏 Cricket Run-Chase Calculator</a>
          <span>Second innings, chasing a target: enter the score you are after, how far the chase has got, and see the current rate, the required rate…</span>
        </li>
        <li>
          <a href="tool.html?card=cricket-net-run-rate-calculator">🏏 Cricket Net Run Rate Calculator</a>
          <span>The tie-breaker that decides tournaments. Add each match's runs and overs for and against, and this works out your aggregate Net Run Rate…</span>
        </li>
        <li>
          <a href="tool.html?card=curling-score-calculator">🥌 Curling Score Calculator</a>
          <span>In each end, the team with the stone closest to the button scores one point for every stone nearer than the opposition's best. Enter each…</span>
        </li>
        <li>
          <a href="tool.html?card=cycling-power-speed-calculator">🚴 Cycling Power & Speed Calculator</a>
          <span>How many watts to hold 40 km/h up a 4% climb? Or what speed does your FTP actually buy you? This models the three forces a rider fights —…</span>
        </li>
        <li>
          <a href="tool.html?card=darts-average-and-leg-tracker">🎯 Darts 501 Average & Leg Tracker</a>
          <span>Log each visit of three darts and watch your three-dart average climb. Handles the bust rules for you — scoring more than you have left…</span>
        </li>
        <li>
          <a href="tool.html?card=darts-checkout-calculator">🎯 Darts Checkout Calculator</a>
          <span>Stood at the oche wondering how to finish? Type the score you have left and get the standard two- or three-dart checkout. Includes the fu…</span>
        </li>
        <li>
          <a href="tool.html?card=diving-score-calculator">🤸 Diving Score Calculator</a>
          <span>Score a dive the way the judges do: enter the judges' marks and the degree of difficulty, and this drops the outliers and applies the off…</span>
        </li>
        <li>
          <a href="tool.html?card=football-points-needed">⚽ Football Points-Needed Calculator</a>
          <span>The run-in made simple. Put in where your team stands, how many games are left, and the points you are aiming for — a title, promotion, s…</span>
        </li>
        <li>
          <a href="tool.html?card=formula1-championship-points">🏁 F1 Championship Points Calculator</a>
          <span>Tally a driver's season under the current 2025 points system — 25 down to 1 for the top ten, 8 down to 1 for a sprint — and see the runni…</span>
        </li>
        <li>
          <a href="tool.html?card=golf-stableford-scorecard-calculator">⛳ Golf Stableford Points Calculator</a>
          <span>Enter your course handicap and your gross score for each hole, and this works out the shots you receive, your net score, and the Stablefo…</span>
        </li>
        <li>
          <a href="tool.html?card=golf-whs-handicap-calculator">⛳ Golf WHS Handicap Calculator</a>
          <span>The World Handicap System in two steps. Work out a round's Score Differential (what actually feeds your handicap), then turn a Handicap I…</span>
        </li>
        <li>
          <a href="tool.html?card=gymnastics-score-calculator">🤸 Gymnastics Score Calculator</a>
          <span>A gymnastics score is difficulty plus execution. Enter the D-score, tick the deductions, and this works out the E-score (out of 10) and t…</span>
        </li>
        <li>
          <a href="tool.html?card=handball-scorekeeper">🤾 Handball Scorekeeper</a>
          <span>Two halves, goals, and the two-minute suspensions that define the game. Tap to score, track each team's suspensions, and keep the running…</span>
        </li>
        <li>
          <a href="tool.html?card=ice-hockey-goalie-stats">🏒 Ice Hockey Goalie Stats</a>
          <span>Turn a goalie's box score into the numbers that matter: goals-against average, save percentage, and a win–loss record — with a read on ho…</span>
        </li>
        <li>
          <a href="tool.html?card=motorsport-lap-time-stint-calculator">🏎️ Motorsport Lap Time & Stint Calculator</a>
          <span>Turn a lap time into an average speed and a full race duration, see how much each pit stop costs, and — if you have a rival's lap time —…</span>
        </li>
        <li>
          <a href="tool.html?card=netball-scorekeeper">🏐 Netball Scorekeeper</a>
          <span>Four quarters, one point a goal. Tap a team to add their goals, advance the quarter, and keep a clean running score with the per-quarter…</span>
        </li>
        <li>
          <a href="tool.html?card=powerlifting-dots-wilks-score">🏋️ Powerlifting DOTS & Wilks Score</a>
          <span>Compare lifters across weight classes. Enter a bodyweight and total (or the three lifts) and get both the modern DOTS score and the class…</span>
        </li>
        <li>
          <a href="tool.html?card=premier-league">⚽ Premier League Live</a>
          <span>Live Premier League data scraped from current online sources. Teams update automatically.</span>
        </li>
        <li>
          <a href="tool.html?card=race-pace-predictor">🏃 Race Pace Predictor & Training Paces</a>
          <span>Enter one recent race you actually ran, honestly, and this predicts the rest, gives you the pace to hold per kilometre or mile, and turns…</span>
        </li>
        <li>
          <a href="tool.html?card=round-robin-fixture-generator">📅 Round-Robin Fixture Generator</a>
          <span>Generate a full league schedule where every team plays every other team — once, or twice home and away. The circle method guarantees no t…</span>
        </li>
        <li>
          <a href="tool.html?card=rowing-erg-pace-calculator">🚣 Rowing Erg Pace Calculator</a>
          <span>The rowing machine's watts and your 500 m split are two ways of saying the same thing. Enter either and this works out the other, plus yo…</span>
        </li>
        <li>
          <a href="tool.html?card=rugby-points-score-builder">🏉 Rugby Points Score Builder</a>
          <span>Try 5, conversion 2, penalty 3, drop goal 3. Add up a score, or work backwards: give a points gap and this lists every combination of tri…</span>
        </li>
        <li>
          <a href="tool.html?card=running-cadence-stride-calculator">🏃 Running Cadence & Stride Length</a>
          <span>Cadence, pace and stride length are locked together — fix any two and the third is forced. Fill in the two you know and this computes the…</span>
        </li>
        <li>
          <a href="tool.html?card=running-split-pace-calculator">🏃 Running Split Pace Calculator</a>
          <span>Target time for a race distance → pace per km and per mile, plus even kilometre splits. Negative splits are a planning aid, not a trainin…</span>
        </li>
        <li>
          <a href="tool.html?card=showjumping-faults-calculator">🐎 Showjumping Faults Calculator</a>
          <span>Faults add up fast: 4 for a knockdown, 4 for a refusal, and 1 for every second over the time allowed. Enter a round and get the total, th…</span>
        </li>
        <li>
          <a href="tool.html?card=snooker-scorer-and-snookers">🎱 Snooker Snookers-Required Calculator</a>
          <span>The question every frame hinges on: can the player behind still win, and how many snookers do they need? Set the balls left on the table…</span>
        </li>
        <li>
          <a href="tool.html?card=swimming-pace-calculator">🏊 Swimming Pace & CSS Calculator</a>
          <span>Turn a swim time into pace per 100 m, per length and full splits, then — if you have a 200 m and a 400 m test time — get your Critical Sw…</span>
        </li>
        <li>
          <a href="tool.html?card=table-tennis-scorekeeper">🏓 Table Tennis Scorer</a>
          <span>Rally scoring to 11, win by two — no cap, so a deuce game can run long. Tap to score and it tracks games and the best-of-five (or seven)…</span>
        </li>
        <li>
          <a href="tool.html?card=tennis-live-scorer">🎾 Tennis Match Scorer</a>
          <span>Score a match point by point with the correct rules handled for you: deuce and advantage, sets to six with a two-game lead, a seven-point…</span>
        </li>
        <li>
          <a href="tool.html?card=tournament-bracket-generator">🏆 Tournament Bracket Generator</a>
          <span>Knock out a single-elimination draw in seconds. Pick how many teams, name them if you like, and get a seeded bracket with the right numbe…</span>
        </li>
        <li>
          <a href="tool.html?card=triathlon-race-planner">🏊‍♂️ Triathlon Race Planner</a>
          <span>Build a race-day plan: pick a distance, enter your swim pace, bike speed, run pace and transitions, and this gives you the time for each…</span>
        </li>
        <li>
          <a href="tool.html?card=volleyball-score-sheet">🏐 Volleyball Score Sheet & Rotation</a>
          <span>Rally scoring to 25 (win by two, up to 30), with the fifth set to 15 — plus a rotation tracker: list your six players in serving order an…</span>
        </li>
        <li>
          <a href="tool.html?card=weightlifting-sinclair-score">🏋️ Weightlifting Sinclair Score</a>
          <span>The Sinclair coefficient lets lifters of different bodyweights be compared. Enter sex, bodyweight and total, and this computes the 2025–2…</span>
        </li>
        <li>
          <a href="tool.html?card=youth-team-rotation-planner">👧 Youth Team Rotation Planner</a>
          <span>Every child gets a fair go. Tell it how many players, how many are on the pitch at once, and how long the game lasts, and it builds a sub…</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="writing-and-language">
      <h2>✍️ Writing & Language <span class="count">76 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=anagram-solver">🔤 Anagram Solver</a>
          <span>Find every word you can make from your letters — from two letters up to the full anagram — with optional pattern matching.</span>
        </li>
        <li>
          <a href="tool.html?card=braille-alphabet-trainer">🔵 Braille Alphabet Trainer</a>
          <span>Learn the 26 letters of English Braille by building cells dot by dot and decoding them. Each letter is a 2×3 grid of raised dots — once y…</span>
        </li>
        <li>
          <a href="tool.html?card=business-writing">Business Writing Assistant</a>
          <span>Draft clear, professional business documents: memos, executive summaries, proposals, and meeting notes. Choose the document type, enter t…</span>
        </li>
        <li>
          <a href="tool.html?card=character-limit-platform-counter">🔤 Platform Character Counter</a>
          <span>Count characters against the live limits for X/Twitter, SMS, Google titles, Instagram, LinkedIn and more. Everything stays in this box —…</span>
        </li>
        <li>
          <a href="tool.html?card=chinese-tones-pinyin">🇨🇳 Chinese Tones & Pinyin</a>
          <span>Conquer the 4 tonal contours of Mandarin Chinese (High Flat, Rising, Dipping, Falling) and explore foundational HSK 1 vocabulary with nat…</span>
        </li>
        <li>
          <a href="tool.html?card=citation">📚 Citation Generator</a>
          <span>Generate perfectly formatted citations in APA, MLA, or Chicago style. Supports multiple authors, websites, and academic sources.</span>
        </li>
        <li>
          <a href="tool.html?card=cognitive-bias-detector">🔍 Cognitive Bias Detector</a>
          <span>Interrogate any argument, news headline, debate talking point, or internal decision. TruthLens scans text against 24 universal cognitive…</span>
        </li>
        <li>
          <a href="tool.html?card=common-english-mistakes-trainer">✏️ Common English Mistakes Trainer</a>
          <span>Fix the most common English errors — its/it's, there/their, affect/effect and more — one sentence at a time.</span>
        </li>
        <li>
          <a href="tool.html?card=cover-letter">✍️ Cover Letter Builder</a>
          <span>PROFESSIONAL TOOL - Create tailored cover letters with industry-specific templates, ATS optimization, and professional tone analysis. Use…</span>
        </li>
        <li>
          <a href="tool.html?card=creative-writing">Creative Writing</a>
          <span>Instant, free online Creative Writing tool. No signup required.</span>
        </li>
        <li>
          <a href="tool.html?card=email-templates">📧 Email Template Generator</a>
          <span>💼 Generate perfectly crafted professional emails, LinkedIn messages, and business communications. Includes tone analysis, etiquette tips…</span>
        </li>
        <li>
          <a href="tool.html?card=essay-templates">📝 Essay Writing Assistant</a>
          <span>Generate structured essay outlines, starter paragraphs, and writing guidance for any topic. Perfect for students, writers, and profession…</span>
        </li>
        <li>
          <a href="tool.html?card=essay">🧭 Argument Mapper</a>
          <span>Structure an essay or debate case before you write it. Lay out your thesis, the premises supporting it and the strongest objections, then…</span>
        </li>
        <li>
          <a href="tool.html?card=flesch-reading-ease">📖 Flesch Reading Ease</a>
          <span>Score = 206.835 − 1.015×(words/sentences) − 84.6×(syllables/words). 60–70 is plain English; under 30 is academic. Syllables are guessed f…</span>
        </li>
        <li>
          <a href="tool.html?card=french-pronunciation-verbs">🇫🇷 French Verbs & Pronunciation</a>
          <span>Master the most critical French irregular verbs (être, avoir, aller, faire) and unlock fluent French pronunciation with our guide to sile…</span>
        </li>
        <li>
          <a href="tool.html?card=german-cases-gender">🇩🇪 German Cases & Gender</a>
          <span>Conquer the 4 German grammatical cases (Nominativ, Akkusativ, Dativ, Genitiv) and understand exactly how der, die, das shift based on sub…</span>
        </li>
        <li>
          <a href="tool.html?card=grammar-proof">Grammar Proofreader ✍️</a>
          <span>Check text for grammar, spelling, punctuation, and style issues. Get suggestions and explanations to improve your writing.</span>
        </li>
        <li>
          <a href="tool.html?card=irregular-verbs-trainer">🔁 Irregular Verbs Trainer</a>
          <span>Drill the English verbs that refuse to follow the rules — go/went/gone, swim/swam/swum — in 8-question rounds, with a full reference tabl…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-jlpt-vocabulary">📖 JLPT Vocabulary Studio</a>
          <span>Supercharge your Japanese vocabulary for the JLPT N5 and N4 examinations. Includes native audio pronunciation, Furigana reading toggles…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-kana-trainer">🎌 Japanese Kana Trainer</a>
          <span>Master the foundation of Japanese. Interactive 46-character syllabaries for both Hiragana and Katakana with native audio pronunciation, d…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-keigo-politeness">👑 Japanese Keigo Master</a>
          <span>Navigate the 3 crucial Japanese speech registers: Casual (with friends), Teineigo (everyday polite), Sonkeigo (honorific/clients), and Ke…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-numbers-counters">🔢 Japanese Counters & Numbers</a>
          <span>Conquer Japanese counter words (助数詞 - Josūshi). In Japanese, you cannot simply say "three beers" or "two cats"—objects require specific c…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-particles-master">🧩 Japanese Particles Master</a>
          <span>Master the grammatical glue of Japanese sentences (助詞 - Joshi). Practice tricky distinctions like は vs が (topic vs subject) and に vs で (t…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-romaji-converter">🔄 Romaji & Kana Converter</a>
          <span>Type in standard alphabet (Romaji) and watch it convert in real-time into Hiragana and Katakana. Also translates Kana back into Hepburn R…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-verb-conjugator">⚡ Japanese Verb Conjugator</a>
          <span>Instantly conjugate any Japanese verb across all core grammatical forms (Present, Negative, Past, Te-form, Potential, Volitional, and Pas…</span>
        </li>
        <li>
          <a href="tool.html?card=kanji-helper">🎌 Japanese Kanji Helper</a>
          <span>Learn, practice, and master Japanese kanji with REAL stroke order animations, meanings, readings, and example words.</span>
        </li>
        <li>
          <a href="tool.html?card=keyword-density-word-frequency">📊 Keyword Density & Word Frequency</a>
          <span>Paste copy and see word count, the densest terms, and an optional target keyword’s density. Counts are local and crude (no stemming). Den…</span>
        </li>
        <li>
          <a href="tool.html?card=korean-hangul-trainer">🇰🇷 Korean Hangul Trainer</a>
          <span>Learn Hangul (한글), the world's most scientific writing system. Explore the 14 basic consonants, 10 vowels, and combine them into complete…</span>
        </li>
        <li>
          <a href="tool.html?card=languages">Languages Tool</a>
          <span>Translate words, check meanings, and practice languages. Uses open-source translation services.</span>
        </li>
        <li>
          <a href="tool.html?card=literature-analysis">🧠 AI Study Assistant</a>
          <span>🚀 Ace your exams: Transform any topic into flashcards, practice quizzes, study guides, and mnemonics. Perfect for students, lifelong lear…</span>
        </li>
        <li>
          <a href="tool.html?card=literature">📚 AI Literature Analyzer</a>
          <span>🚀 Ultimate literary toolkit: Analyze any text AND generate study materials. Perfect for students, teachers, and book lovers.</span>
        </li>
        <li>
          <a href="tool.html?card=llm-prompt-token-counter">💬 LLM Prompt Token Counter</a>
          <span>Estimate LLM token usage, calculate API cost per query, and compress prompt text to eliminate token waste and latency.</span>
        </li>
        <li>
          <a href="tool.html?card=lorem-ipsum-generator">📜 Lorem Ipsum Generator</a>
          <span>Generate placeholder text for designs, mockups, and layouts. Choose paragraphs, sentences, or words with one click.</span>
        </li>
        <li>
          <a href="tool.html?card=lorem-ipsum-placeholder-text">📄 Lorem Ipsum & Placeholder Text</a>
          <span>Generate filler text for mockups and layouts: classic Lorem Ipsum, plain English, or themed flavours (tech jargon, cooking, pirate, corpo…</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-live-editor">📝 Markdown Live Editor</a>
          <span>Write, preview, and format Markdown in real-time. Features instant HTML rendering, live word & reading time analytics, syntax quick-tags…</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-to-html-printer">📄 Markdown Document Forge</a>
          <span>Transform raw Markdown into publication-ready corporate memos, academic whitepapers, and printable PDFs with 1-click browser export.</span>
        </li>
        <li>
          <a href="tool.html?card=meme-translation">🎭 Meme Translator</a>
          <span>The ultimate internet language decoder. Translate memes, slang, acronyms, and internet speak with context, origins, and examples. 🌐 Real-…</span>
        </li>
        <li>
          <a href="tool.html?card=morse-code-translator">📡 Morse Code Translator</a>
          <span>Translate text to Morse code and back. Listen to the Morse code audio and learn the international standard.</span>
        </li>
        <li>
          <a href="tool.html?card=multilingual-phrase-matrix">🌐 10-Language Phrasebook</a>
          <span>Compare, learn, and pronounce essential survival phrases side-by-side across 10 of the world's most spoken languages with instant native…</span>
        </li>
        <li>
          <a href="tool.html?card=nato-phonetic-alphabet-trainer">📡 NATO Phonetic Alphabet Trainer</a>
          <span>Master the international radio alphabet — Alfa, Bravo, Charlie — used so letters can never be misheard. Spell words out loud, test yourse…</span>
        </li>
        <li>
          <a href="tool.html?card=nato-phonetic-speller">📡 NATO Phonetic Speller</a>
          <span>Spell a name, postcode or booking reference the way air-traffic and support desks do. ICAO/NATO alphabet (Alfa, Bravo…). Digits stay as w…</span>
        </li>
        <li>
          <a href="tool.html?card=parts-of-speech-trainer">🧠 Parts of Speech Trainer</a>
          <span>Name the eight parts of speech — noun, verb, adjective, adverb, pronoun, preposition, conjunction, interjection — in 10-question rounds w…</span>
        </li>
        <li>
          <a href="tool.html?card=plagiarism-check">🔍 Plagiarism Checker</a>
          <span>Check text for originality and similarity with common phrases. Local processing only — no data sent online.</span>
        </li>
        <li>
          <a href="tool.html?card=proofreading">✍️ Proofreading & Style Checker</a>
          <span>Advanced text analysis for grammar, style, readability, and clarity. Get detailed suggestions with explanations.</span>
        </li>
        <li>
          <a href="tool.html?card=public-speaking">🎤 Public Speaking Coach</a>
          <span>Improve your speeches with AI-powered analysis, practice tools, and personalized feedback. Practice timing, structure, delivery, and conf…</span>
        </li>
        <li>
          <a href="tool.html?card=punctuation-guide">📝 Punctuation Mastery Guide</a>
          <span>Master the art of punctuation with this comprehensive guide. Learn rules, see examples, and test your knowledge. Perfect for writers, stu…</span>
        </li>
        <li>
          <a href="tool.html?card=readability-score">📊 Readability Analyzer</a>
          <span>Analyze text readability with multiple scoring systems. Get actionable insights to improve your writing for any audience. Supports 8+ rea…</span>
        </li>
        <li>
          <a href="tool.html?card=readingtime">📚 Reading Time Calculator</a>
          <span>Calculate precise reading time estimates with multiple input methods, audience presets, and detailed breakdowns. Perfect for writers, edi…</span>
        </li>
        <li>
          <a href="tool.html?card=regex-replace-string-transform">⚡ Regex Transform Studio</a>
          <span>Search, replace, extract capture groups, and batch-transform text with real-time regular expression pattern matching.</span>
        </li>
        <li>
          <a href="tool.html?card=regex-tester-explainer">⚡ Regex Tester & Explainer</a>
          <span>Test, debug, and understand regular expressions in real-time. Features live match highlighting, capture group extraction, and a built-in…</span>
        </li>
        <li>
          <a href="tool.html?card=resume">📄 Resume Builder</a>
          <span>Create and preview a professional resume. Generates clean, printable format.</span>
        </li>
        <li>
          <a href="tool.html?card=rhyme-finder">🪞 Rhyme Finder</a>
          <span>Find true rhymes and near rhymes for any word — powered by an embedded CMU pronunciation dictionary, no network needed.</span>
        </li>
        <li>
          <a href="tool.html?card=seo-helper">🔍 SEO & Content Optimizer</a>
          <span>Professional SEO analysis, optimization, and content planning. Get actionable insights and comprehensive reports.</span>
        </li>
        <li>
          <a href="tool.html?card=seo-writing">✍️ SEO Writing Assistant</a>
          <span>Optimize text for search engines. Paste your draft, choose focus keywords, and get suggestions for keyword density, headings, meta descri…</span>
        </li>
        <li>
          <a href="tool.html?card=socratic-thinking-coach">🏛️ Socratic Thinking Coach</a>
          <span>Sharpen your reasoning: stress-test any claim with Socratic questions, steelman the other side of an argument, and learn to spot 10 class…</span>
        </li>
        <li>
          <a href="tool.html?card=spanish-verb-master">🇪🇸 Spanish Verb Conjugator</a>
          <span>Master Spanish verb conjugations, conquer the notorious Ser vs Estar dilemma (permanent essence vs temporary state), and master Por vs Pa…</span>
        </li>
        <li>
          <a href="tool.html?card=speed-reading-rsvp-trainer">⚡ Speed-Reading RSVP Trainer</a>
          <span>Train your brain to read faster with rapid serial visual presentation — while absorbing fascinating true passages about science and histo…</span>
        </li>
        <li>
          <a href="tool.html?card=speed-reading-trainer">⚡ Speed Reading Trainer</a>
          <span>Measure your words-per-minute, then train with guided pacing where your eye is told where to look. Includes recall questions and live WPM…</span>
        </li>
        <li>
          <a href="tool.html?card=spelling-check">🔍 Smart Spelling Checker</a>
          <span>Advanced spelling checker using multiple open-source dictionary APIs combined for maximum accuracy. ⚠️ Requires internet connection for o…</span>
        </li>
        <li>
          <a href="tool.html?card=story-dice-plot-twister">🎲 Story Dice Plot Twister</a>
          <span>Roll story dice for a hero, a setting, a mysterious object and a plot twist — then write the tale. With challenge-mode constraints, story…</span>
        </li>
        <li>
          <a href="tool.html?card=summary-generator">AI-Style Summary Generator</a>
          <span>AI-Style Summary Generator Generate intelligent summaries using advanced text analysis algorithms</span>
        </li>
        <li>
          <a href="tool.html?card=synonym-finder">🔄 Synonym Finder</a>
          <span>Find better words — synonyms and near-synonyms for 100+ common English words, with usage tips for the tricky ones.</span>
        </li>
        <li>
          <a href="tool.html?card=text-to-handwriting">✍️ Text to Handwriting</a>
          <span>Convert typed text into realistic handwriting. Choose styles, sizes, and colors. Download as image.</span>
        </li>
        <li>
          <a href="tool.html?card=text-to-image">🖼️ Text to Image Generator</a>
          <span>Create images from text. Choose fonts, colors, backgrounds, and sizes. Perfect for social media posts and headers.</span>
        </li>
        <li>
          <a href="tool.html?card=text-to-speech-reader-voices">🔊 Text-to-Speech Reader (Offline Browser Voices)</a>
          <span>Paste any text and have your device read it aloud using the voices already built into your browser or operating system — no upload, no ac…</span>
        </li>
        <li>
          <a href="tool.html?card=text-to-speech">🔊 Text to Speech</a>
          <span>Convert text to speech using your browser's built-in voice synthesis. Choose voices, adjust speed and pitch.</span>
        </li>
        <li>
          <a href="tool.html?card=tongue-twister-trainer">🎤 Tongue Twister Trainer</a>
          <span>Practise classic tongue twisters at your own pace, then beat the clock: read as many as you can in 30 seconds.</span>
        </li>
        <li>
          <a href="tool.html?card=translation-helper">🌍 Translation Helper</a>
          <span>Translate text between languages with style and tone analysis. Includes language detection and clarity checking!</span>
        </li>
        <li>
          <a href="tool.html?card=typing-speed-test">⌨️ Typing Speed Test</a>
          <span>Measure your typing speed and accuracy with live feedback. Type the passage, watch your WPM build as you go, and see exactly which charac…</span>
        </li>
        <li>
          <a href="tool.html?card=typing-story-sprint">⌨️ Typing Story Sprint</a>
          <span>Build typing speed by retyping fascinating true mini-stories — bees, pyramids, photosynthesis. Live WPM, accuracy, tricky-key analysis an…</span>
        </li>
        <li>
          <a href="tool.html?card=vocab">📝 Word List Flashcards</a>
          <span>Build vocabulary with spaced repetition flashcards. Add words, quiz yourself, and track mastery.</span>
        </li>
        <li>
          <a href="tool.html?card=vocabulary-trainer">Vocabulary Trainer</a>
          <span>Add words with definitions and examples, practise with flashcards or quick quizzes, and track progress with simple Leitner boxes. Data is…</span>
        </li>
        <li>
          <a href="tool.html?card=word-frequency-counter">📊 Word Frequency Counter</a>
          <span>Analyze text to find the most common words, unique words, and word frequency distribution with visual charts.</span>
        </li>
        <li>
          <a href="tool.html?card=youth-aesthetic-bio">✨ Aesthetic Bio Generator</a>
          <span>Generate stylish bios for Instagram, TikTok, Discord, Twitter/X, and more — with fonts, symbols, and vibes</span>
        </li>
        <li>
          <a href="tool.html?card=youth-caption-generator">📱 Caption Generator</a>
          <span>Generate Instagram, TikTok, and selfie captions — funny, aesthetic, savage, or wholesome</span>
        </li>
        <li>
          <a href="tool.html?card=youth-resume-builder">📄 First Resume Builder</a>
          <span>Build your first CV or resume — even with no experience. Fill in what you have, get a clean, professional resume</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="productivity-and-lifestyle">
      <h2>⚡ Productivity & Lifestyle <span class="count">168 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=adulting-score">🏠 Adulting Score Calculator</a>
          <span>How well are you really adulting? Take this brutally honest assessment and find out.</span>
        </li>
        <li>
          <a href="tool.html?card=ai-toolbox">🤖 AI Toolbox Generator</a>
          <span>Build your own custom AI tools by combining different AI capabilities. Create, save, and share personalized mini-tools in minutes! ✨ No c…</span>
        </li>
        <li>
          <a href="tool.html?card=ascii-text-banner-art-generator">🔤 ASCII Banner Generator</a>
          <span>Generate retro ASCII text banners and terminal art for code headers, GitHub READMEs, Discord bots, and CLI scripts.</span>
        </li>
        <li>
          <a href="tool.html?card=awkward-silence-filler">🗣️ Awkward Silence Filler</a>
          <span>The silence is deafening. Someone needs to say something. Let us help. (Results may make it worse.)</span>
        </li>
        <li>
          <a href="tool.html?card=birthday">Birthday Reminder</a>
          <span>No birthdays added yet. Add your first birthday above!</span>
        </li>
        <li>
          <a href="tool.html?card=blame-deflector">💢 Blame Deflector 3000</a>
          <span>Something went wrong? Don't worry — it's definitely not your fault. Let science* find someone else to blame. *Not science.</span>
        </li>
        <li>
          <a href="tool.html?card=bra-size-converter">🎀 Bra Size Converter</a>
          <span>Convert UK, US, EU/FR and AU band + cup. Sister sizes keep the same cup volume (one band up, one cup down). Brands still vary — treat thi…</span>
        </li>
        <li>
          <a href="tool.html?card=business-card-size-guide">💳 Business Card Size Guide</a>
          <span>Print sizes and pixels for UK/EU (85 × 55 mm), US (3.5 × 2 in), Japanese and Chinese cards. Add 3 mm bleed if a printer asks for it. Not…</span>
        </li>
        <li>
          <a href="tool.html?card=cabin-bag-airline-size-checker">🧳 Cabin Bag Size Checker</a>
          <span>Type your suitcase in centimetres and see which common airlines it should fit, including wheels and handles as the airline measures them…</span>
        </li>
        <li>
          <a href="tool.html?card=caffeine-half-life-bedtime-check">☕ Will You Sleep Tonight? (Caffeine Check)</a>
          <span>Caffeine has a half-life of roughly five hours, which is why the 4pm espresso is still in your system at midnight. Log what you drank and…</span>
        </li>
        <li>
          <a href="tool.html?card=careerpath">Career Path Planner</a>
          <span>Map out your career goals, milestones, and track progress over time. Save and manage multiple career plans.</span>
        </li>
        <li>
          <a href="tool.html?card=cartographers-world-forge">🗺️ Cartographer's World Forge</a>
          <span>Forge an entire fantasy world from a single seed. Tectonic uplift raises mountains, rain shadows carve deserts, rivers find the sea, and…</span>
        </li>
        <li>
          <a href="tool.html?card=cat-photo-viewer">Cat Photo Viewer</a>
          <span>Browse cat photos from free public APIs. Features infinite scrolling, favorites, and breed info.</span>
        </li>
        <li>
          <a href="tool.html?card=censorship-monitor">🌐 Censorship Monitor</a>
          <span>Monitor Wikipedia blocks and Reddit content moderation in real-time. ⚠️ Educational tool - uses public APIs</span>
        </li>
        <li>
          <a href="tool.html?card=chemistry">Chemistry Helper</a>
          <span>Calculate molar mass, balance equations, analyze compounds, and reference periodic table data.</span>
        </li>
        <li>
          <a href="tool.html?card=christmas-card-maker">🎄 Christmas Card Maker</a>
          <span>Design and generate beautiful, custom HTML Christmas cards in seconds. Perfect for emails, social media, or personal websites.</span>
        </li>
        <li>
          <a href="tool.html?card=christmas-naughty-list-quiz">🎅 Santa's Naughty List Quiz</a>
          <span>Take this scientific* holiday quiz to discover if you're getting coal or presents this Christmas! *Not actually scientific</span>
        </li>
        <li>
          <a href="tool.html?card=cleaning">🧹 Cleaning Schedule</a>
          <span>Plan, track, and manage cleaning tasks with smart scheduling. Never forget a chore again!</span>
        </li>
        <li>
          <a href="tool.html?card=clip-short">🎬 Clip‑to‑Shorts Repackager</a>
          <span>Upload a gameplay clip, pick a segment, and export a perfectly framed vertical short (9:16) or other preset. Adds caption safe zone and o…</span>
        </li>
        <li>
          <a href="tool.html?card=clipboard-history">📋 Clipboard History</a>
          <span>Save and manage text snippets. Copy, pin, search, and organize your frequently used text. Persists in browser storage.</span>
        </li>
        <li>
          <a href="tool.html?card=clothing-size-converter">👕 Clothing Size Converter</a>
          <span>Convert common adult clothing sizes between US, UK and EU for tops, dresses and men’s shirts. Charts are industry averages — cut, stretch…</span>
        </li>
        <li>
          <a href="tool.html?card=coat-or-no-coat-weather">🧥 Coat, Hoodie, or Regret?</a>
          <span>The daily sartorial gamble, solved. Dial in the temperature, wind and rain, tell it how long you'll be out, and it will tell you what to…</span>
        </li>
        <li>
          <a href="tool.html?card=coincidence-finder">🔮 Coincidence Finder & Synchronicity Tracker</a>
          <span>Discover meaningful coincidences and synchronicities across multiple real-time data sources. Tracks news, numbers, dates, names, and glob…</span>
        </li>
        <li>
          <a href="tool.html?card=collaboration">🤖 AI Team Hub</a>
          <span>AI-powered team management with workload balancing, predictive analytics, and automated optimization. ⚡ Smart suggestions • 🎯 Predictive…</span>
        </li>
        <li>
          <a href="tool.html?card=color-contrast-wcag-simulator">👁️ WCAG Contrast & Vision</a>
          <span>Test color contrast ratios against WCAG 2.2 accessibility standards (AA / AAA) and simulate color-vision deficiencies in real time.</span>
        </li>
        <li>
          <a href="tool.html?card=color-converter-harmony-studio">🎨 Color Converter & Palette Harmony Studio</a>
          <span>Convert between HEX, RGB, HSL, HSV, CMYK, and OKLCH color spaces, generate color harmonies, test WCAG 2.1 contrast ratios, and copy CSS c…</span>
        </li>
        <li>
          <a href="tool.html?card=color-harmony-palette-generator">🎨 Colour Harmony Palette</a>
          <span>Complementary, analogous, triadic and split-complement palettes from one hex colour. Hue is rotated on the HSL wheel; saturation and ligh…</span>
        </li>
        <li>
          <a href="tool.html?card=color-hex-rgb-hsl-converter">🎨 Colour Converter HEX RGB HSL</a>
          <span>Convert any colour between HEX, RGB, HSL, HSV and CMYK, with a live swatch and one-click copy. Parsing is local — no eyedropper upload, n…</span>
        </li>
        <li>
          <a href="tool.html?card=color-picker-converter">🎨 Color Picker & Converter</a>
          <span>Pick colors visually and convert between HEX, RGB, HSL, and HSV formats. Generate palettes and copy values instantly.</span>
        </li>
        <li>
          <a href="tool.html?card=color-picker-hex-rgb-hsl-converter">🎨 Colour Picker & HEX / RGB / HSL Converter</a>
          <span>Pick a colour or paste any CSS colour (HEX, RGB, HSL, or a named colour) and get every format back instantly — plus tints, shades, comple…</span>
        </li>
        <li>
          <a href="tool.html?card=commute">🚗 Commute Calculator</a>
          <span>Calculate commute time, cost, and environmental impact. Compare different transportation modes. ✅ Tracks daily, weekly, monthly, and year…</span>
        </li>
        <li>
          <a href="tool.html?card=conspiracy-theory-generator">🤡 Conspiracy Theory Generator</a>
          <span>Generate absurd conspiracy theories that are somehow more believable than the real ones.</span>
        </li>
        <li>
          <a href="tool.html?card=cost-per-use-buy-or-not">🛒 Cost-Per-Use: Should You Buy It?</a>
          <span>The antidote to impulse buying. Feed it a price and honest usage guesses, and it tells you whether that thing is a bargain, a luxury, or…</span>
        </li>
        <li>
          <a href="tool.html?card=countdown-timer-stopwatch-laps">⏳ Countdown Timer & Stopwatch with Laps</a>
          <span>A precise stopwatch with lap splits and a countdown timer with presets, keyboard shortcuts (Space = start/stop, L = lap, R = reset) and a…</span>
        </li>
        <li>
          <a href="tool.html?card=cron-schedule-expression-builder">⏱️ Cron Schedule Builder</a>
          <span>Construct cron expressions with interactive dials, read instant plain-English explanations, and preview the next 10 trigger times.</span>
        </li>
        <li>
          <a href="tool.html?card=crop-factor-35mm-equivalent">🖼️ Crop Factor & 35 mm Equivalent</a>
          <span>35 mm-equivalent focal length = actual focal length × crop factor. Also shows equivalent f-number for depth of field (same framing). Fiel…</span>
        </li>
        <li>
          <a href="tool.html?card=css-glassmorphism-gradient-generator">🎨 CSS Glass & Gradients</a>
          <span>Design modern frosted glass (glassmorphism) components and mesh gradients. Real-time visual canvas with 1-click cross-browser CSS.</span>
        </li>
        <li>
          <a href="tool.html?card=cv-builder">📄 Professional CV Builder</a>
          <span>PROFESSIONAL CV CREATOR - Build ATS-optimized CVs with multiple templates, real-time preview, and export options. Used by career coaches…</span>
        </li>
        <li>
          <a href="tool.html?card=daily-curiosity-fact-deck">✨ Curiosity Fact Deck</a>
          <span>48 verified fascinating facts across space, nature, history, the body, Earth and technology — with a fact of the day, favourites and a qu…</span>
        </li>
        <li>
          <a href="tool.html?card=decision-matrix-weighted-scorer">⚖️ Decision Matrix Scorer</a>
          <span>Evaluate complex career, business, or lifestyle choices using weighted multi-criteria scoring. Removes emotional bias and highlights the…</span>
        </li>
        <li>
          <a href="tool.html?card=dimensional-weight-shipping-calculator">📦 Dimensional Weight Calculator</a>
          <span>Carriers bill the higher of actual weight and volumetric (dimensional) weight. Enter the box and compare IATA /6000, DHL·FedEx /5000 and…</span>
        </li>
        <li>
          <a href="tool.html?card=dog-photo-viewer">🐕 Dog Photo Viewer</a>
          <span>COMPLETE DOG VIEWER - Browse thousands of dog photos with breed information, favorites, and infinite scrolling. Multiple API sources for…</span>
        </li>
        <li>
          <a href="tool.html?card=emoji-meaning-decoder">🤔 What Does That Emoji *Actually* Mean?</a>
          <span>The generational emoji gap, decoded. Search or tap an emoji to see what it really means, how your boss probably reads it, and whether it'…</span>
        </li>
        <li>
          <a href="tool.html?card=event">📅 Event Reminder</a>
          <span>Set reminders for upcoming events with notifications, priorities, and recurrence options.</span>
        </li>
        <li>
          <a href="tool.html?card=exam">🎯 Exam & Study Planner</a>
          <span>📚 A comprehensive exam planning and study management system for students and professionals. Track exams, create study schedules, set goal…</span>
        </li>
        <li>
          <a href="tool.html?card=excuse-generator">🙃 Professional Excuse Generator</a>
          <span>Generate increasingly absurd excuses for any situation. From "plausible" to "they'll never believe you."</span>
        </li>
        <li>
          <a href="tool.html?card=extruded-3d-text-studio">✏️ Extruded 3D Text Studio</a>
          <span>Design chunky 3D logos: real perspective rotation (rendered slice-by-slice in software), adjustable extrusion depth, bevel light, backdro…</span>
        </li>
        <li>
          <a href="tool.html?card=fabric-yardage-estimator">🧵 Fabric Yardage Estimator</a>
          <span>Pattern envelopes quote fabric for one specific width, and most fabric is not sold in that width. This converts for the width you actuall…</span>
        </li>
        <li>
          <a href="tool.html?card=flashcards">📚 Smart Flashcards</a>
          <span>Create beautiful, interactive flashcards for effective studying. Supports rich text, categories, and spaced repetition.</span>
        </li>
        <li>
          <a href="tool.html?card=flat-pack-confidence-meter">🔩 Flat-Pack Confidence Meter</a>
          <span>Enter the flat-pack battlefield armed with the truth: how many pieces, which tools, who's helping, and how many drinks deep you are. It w…</span>
        </li>
        <li>
          <a href="tool.html?card=fluid-type-scale">🔠 Fluid Type Scale Generator</a>
          <span>Generates a typographic scale where every size scales smoothly between two screen widths, using the CSS clamp() function — no media queri…</span>
        </li>
        <li>
          <a href="tool.html?card=focus">⏱️ Deep Focus Timer</a>
          <span>Advanced Pomodoro timer with productivity tracking, ambient sounds, and progress visualization. Stay focused, maximize productivity!</span>
        </li>
        <li>
          <a href="tool.html?card=fuel-economy-mpg-converter">⛽ Fuel Economy MPG Converter</a>
          <span>Convert between US MPG, UK (imperial) MPG, L/100 km and km/L. Optional trip distance estimates fuel used. US gallon = 3.785 L, imperial g…</span>
        </li>
        <li>
          <a href="tool.html?card=fuel-mpg-litres-per-100km-converter">⛽ Fuel Economy Converter: MPG ⇄ L/100km ⇄ km/L</a>
          <span>Convert between UK MPG, US MPG, litres per 100 km, km per litre and miles per litre in one go — or calculate your real-world economy from…</span>
        </li>
        <li>
          <a href="tool.html?card=garden-task">Smart Garden Task Planner</a>
          <span>Plan, track, and grow your perfect garden with AI-powered suggestions and smart scheduling.</span>
        </li>
        <li>
          <a href="tool.html?card=gardening">🌿 Garden Planning Assistant</a>
          <span>Plan, track, and optimize your garden with planting schedules, care reminders, and plant databases. Grow your perfect garden!</span>
        </li>
        <li>
          <a href="tool.html?card=gift">Gift Helper 🎁</a>
          <span>Find the perfect gift with smart suggestions, reminders, and inspiration for every occasion.</span>
        </li>
        <li>
          <a href="tool.html?card=go-outsideometer">🌤️ Go Outsideometer</a>
          <span>A scientifically unserious instrument that measures how long it has been since you touched grass. Answer honestly, and it will tell you e…</span>
        </li>
        <li>
          <a href="tool.html?card=goaltracker">Goal Tracker 🎯</a>
          <span>Set, track, and achieve your goals with progress monitoring, milestones, and motivational reminders.</span>
        </li>
        <li>
          <a href="tool.html?card=golden-ratio-crop-calculator">φ Golden Ratio Crop Calculator</a>
          <span>Grow or crop a rectangle to φ ≈ 1.618, place a golden-section grid, and convert any length into its complementary pair. Used by photograp…</span>
        </li>
        <li>
          <a href="tool.html?card=great-minds-quote-explorer">💬 Great Minds Quote Explorer</a>
          <span>40 inspiring quotes from history's greatest scientists, inventors and thinkers — each with context about who said it and why it matters…</span>
        </li>
        <li>
          <a href="tool.html?card=habit-streak-matrix-tracker">🔥 Habit Streak Grid</a>
          <span>Track daily habits and build unstoppable momentum with a GitHub-style contribution heat map. Saves automatically in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=habit">📈 Habit Tracker</a>
          <span>Build consistent habits with visual streaks and daily tracking. Save your progress automatically!</span>
        </li>
        <li>
          <a href="tool.html?card=hash-checker">🔐 File Hash Checker</a>
          <span>Verify file integrity and calculate cryptographic hashes. Compare hashes to verify file authenticity!</span>
        </li>
        <li>
          <a href="tool.html?card=hash-crypto-encoder-suite">🔐 Crypto & Hash Suite</a>
          <span>Generate cryptographic hashes (SHA-256, SHA-512, MD5), HMAC signatures, and multi-format encodings (Base64, Hex, URL). Fast, client-side…</span>
        </li>
        <li>
          <a href="tool.html?card=hat-size-converter">🎩 Hat Size Converter</a>
          <span>Convert head circumference to UK, US and cm hat sizes. US size ≈ circumference in inches ÷ π. Measure just above the ears, level around t…</span>
        </li>
        <li>
          <a href="tool.html?card=history">📜 Advanced History Timeline Builder</a>
          <span>Create interactive timelines, explore historical databases, and visualize events across civilizations. Perfect for students, educators, a…</span>
        </li>
        <li>
          <a href="tool.html?card=household">🏠 Advanced Household Chore Tracker</a>
          <span>Manage household chores, assign tasks, set schedules, and track completion with reminders. Perfect for families and shared living!</span>
        </li>
        <li>
          <a href="tool.html?card=houseplant-matchmaker">🪴 Houseplant Matchmaker</a>
          <span>The dating app for you and a plant. Answer honestly about your light, your watering habits and your pets, and it will set you up with a h…</span>
        </li>
        <li>
          <a href="tool.html?card=hyperfocal-depth-of-field-calculator">📷 Hyperfocal & Depth of Field</a>
          <span>Hyperfocal distance H = f² / (N × c) + f. Focus there and everything from H/2 to infinity is acceptably sharp. Circle of confusion defaul…</span>
        </li>
        <li>
          <a href="tool.html?card=image-base64-data-url-converter">🖼️ Image to Base64 Studio</a>
          <span>Convert images to Base64 data URLs for inline CSS & HTML embedding, or decode Base64 strings back into downloadable images.</span>
        </li>
        <li>
          <a href="tool.html?card=image-compressor-resizer-offline">🖼️ Image Compressor & Resizer (100% Offline)</a>
          <span>Shrink photos for email, web or forms without uploading them anywhere. Drop in JPG, PNG, WebP or HEIC-converted images, set a maximum wid…</span>
        </li>
        <li>
          <a href="tool.html?card=ingredient-scaler">🧮 Recipe Ingredient Scaler</a>
          <span>Perfectly scale any recipe with smart parsing, automatic unit conversions, and kitchen-tested measurements.</span>
        </li>
        <li>
          <a href="tool.html?card=iso-week-number-finder">📆 ISO Week Number Finder</a>
          <span>Convert a date to its ISO-8601 week (YYYY-Www-d) and the other way around. Weeks start on Monday; week 1 is the week with 4 January (the…</span>
        </li>
        <li>
          <a href="tool.html?card=json-beautifier-validator">🔧 JSON Beautifier & Linter</a>
          <span>Format, minify, validate, and debug JSON payloads with exact syntax error line tracking. 100% private in-browser parsing.</span>
        </li>
        <li>
          <a href="tool.html?card=json-yaml-diff-validator">🔧 JSON & YAML Studio</a>
          <span>Format, validate, convert between JSON & YAML, and compare structural diffs side-by-side. 100% private in-browser processing.</span>
        </li>
        <li>
          <a href="tool.html?card=julian-day-date-converter">🌌 Julian Day Converter</a>
          <span>Convert a calendar date to Julian Day Number (JDN) and Modified Julian Date (MJD = JD − 2,400,000.5). Astronomers count days from noon UT…</span>
        </li>
        <li>
          <a href="tool.html?card=jwt-token-decoder-inspector">🔑 JWT Token Inspector</a>
          <span>Decode and audit JSON Web Tokens offline. Zero network calls — your security tokens never leave your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=kanban-sprint-flow-board">📋 Offline Kanban Sprint Board</a>
          <span>Lightweight, private Kanban board with drag-and-drop cards, custom columns, priority tags, WIP counts, markdown export, and local storage…</span>
        </li>
        <li>
          <a href="tool.html?card=laundry-care-label-stain-solver">🧺 Laundry Care & Stain Solver</a>
          <span>The complete “how to actually do it” guide: pick a fabric and get the right water, cycle and drying, get a step-by-step recip…</span>
        </li>
        <li>
          <a href="tool.html?card=laundry">Laundry Tracker</a>
          <span>Log laundry loads, track completion, and monitor laundry habits with statistics.</span>
        </li>
        <li>
          <a href="tool.html?card=leap-year-weekday-finder">📆 Leap Year & Weekday</a>
          <span>Gregorian leap years are divisible by 4, except centuries unless divisible by 400. 1900 was not a leap year; 2000 was. Also shows the wee…</span>
        </li>
        <li>
          <a href="tool.html?card=learning-style">🧭 Learning Style Self-Assessment</a>
          <span>Answer 8 quick questions to discover your preferred learning style: Visual, Auditory, Reading/Writing, or Kinaesthetic.</span>
        </li>
        <li>
          <a href="tool.html?card=markdown-live-preview">📝 Markdown Live Preview</a>
          <span>Write Markdown on the left, see the rendered preview on the right. Supports headings, lists, code, links, images, and tables.</span>
        </li>
        <li>
          <a href="tool.html?card=meeting-bingo">🎯 Corporate Meeting Bingo</a>
          <span>Mark off buzzwords as your colleagues say them. First to get 5 in a row wins (and loses, because you're still in the meeting).</span>
        </li>
        <li>
          <a href="tool.html?card=meeting-overlap-timezone-planner">🕒 Meeting Overlap Planner</a>
          <span>Find hours when two or three cities are all awake. Uses IANA time zones and this device’s DST tables — no calendar is connected, nothing…</span>
        </li>
        <li>
          <a href="tool.html?card=meeting-time-zone-planner">🌍 World Meeting Time Zone Planner</a>
          <span>Find a meeting slot that works across cities. Add up to eight time zones, drag the slider through the day and see each city's local time…</span>
        </li>
        <li>
          <a href="tool.html?card=meetingplanner">Meeting Planner & Scheduler</a>
          <span>Find optimal meeting times across multiple time zones, track availability, and generate meeting agendas. Perfect for remote teams, interv…</span>
        </li>
        <li>
          <a href="tool.html?card=memento-mori-life-ticker">⏳ Memento Mori Life Ticker</a>
          <span>Your life, visualised as a grid of weeks — then converted into how many summers, books and Sunday roasts you have left. Not to scare you…</span>
        </li>
        <li>
          <a href="tool.html?card=memorization">🎯 Memorization Helper</a>
          <span>Add items to memorize, then test yourself by revealing them later. Perfect for studying, learning vocabulary, or remembering important fa…</span>
        </li>
        <li>
          <a href="tool.html?card=memory-palace-loci-builder">🏛️ Memory Palace Builder</a>
          <span>Memorise anything with the 2,500-year-old method of loci used by memory champions. Build rooms, place vivid images at each stop, walk you…</span>
        </li>
        <li>
          <a href="tool.html?card=moving">🚚 Ultimate Moving Planner</a>
          <span>Complete moving organization tool: Create checklists, track inventory, manage budget, schedule tasks, and coordinate with family/friends…</span>
        </li>
        <li>
          <a href="tool.html?card=nd-filter-exposure-calculator">🕶️ ND Filter Exposure</a>
          <span>New shutter = old shutter × 2^(stops). ND8 is 3 stops, ND64 is 6, ND1000 is 10. Use it for silky water and daytime video at 180° shutter…</span>
        </li>
        <li>
          <a href="tool.html?card=overnight-shift-duration-calculator">🌙 Overnight Shift Duration</a>
          <span>Work out how long a shift is when it crosses midnight, plus unpaid breaks and overtime after a threshold. Built for night staff, on-call…</span>
        </li>
        <li>
          <a href="tool.html?card=overthinkers-calculator">🧮 The Overthinker's Calculator</a>
          <span>Calculate exactly how many ways a situation can go wrong. Spoiler: it's more than you think.</span>
        </li>
        <li>
          <a href="tool.html?card=packing">🧳 Smart Packing List</a>
          <span>Create intelligent packing lists with categories, trip types, weather considerations, and shareable checklists. Never forget an essential…</span>
        </li>
        <li>
          <a href="tool.html?card=palette-swapper">🎨 Advanced Palette Swapper</a>
          <span>Advanced color manipulation with multiple effects, palette extraction, and real-time preview. Transform images with professional color to…</span>
        </li>
        <li>
          <a href="tool.html?card=pan-size-converter">🥘 Pan Size Converter</a>
          <span>Convert between different baking pan sizes and adjust recipes. Calculates volume differences and ingredient scaling.</span>
        </li>
        <li>
          <a href="tool.html?card=paper-size-iso-us-converter">📄 Paper Size Converter</a>
          <span>ISO A/B/C series, US Letter/Legal/Tabloid and pixels at print DPI. A4 is 210 × 297 mm; Letter is 8.5 × 11 in. Sizes are the ISO 216 trimm…</span>
        </li>
        <li>
          <a href="tool.html?card=party">Party Planner</a>
          <span>Plan your party with date, location, and guest list.</span>
        </li>
        <li>
          <a href="tool.html?card=passive-aggressive-translator">📧 Passive Aggressive Email Translator</a>
          <span>Type what you actually want to say. We'll make it sound professional. Ish.</span>
        </li>
        <li>
          <a href="tool.html?card=passport-photo-size-guide">🛂 Passport Photo Size Guide</a>
          <span>Official print sizes and pixel dimensions for UK, US, Schengen, Canada, Australia, India and China visa photos. Face-height rules are lis…</span>
        </li>
        <li>
          <a href="tool.html?card=password-strength-checker">🔐 Password Strength Checker</a>
          <span>Analyze password strength in real time. Check length, complexity, common patterns, and estimated crack time.</span>
        </li>
        <li>
          <a href="tool.html?card=password">Password Generator</a>
          <span>Create strong, random passwords instantly. Customize length and character sets.</span>
        </li>
        <li>
          <a href="tool.html?card=percentage-change">📈 Percentage Change Calculator</a>
          <span>Calculate percentage increase or decrease between two values.</span>
        </li>
        <li>
          <a href="tool.html?card=permutation-combination">🔢 Permutations & Combinations</a>
          <span>Calculate permutations (nPr) and combinations (nCr) — how many ways to arrange or select items.</span>
        </li>
        <li>
          <a href="tool.html?card=petcare">Pet Care Tracker</a>
          <span>Log pet care tasks like feeding, walking, or grooming.</span>
        </li>
        <li>
          <a href="tool.html?card=petty-revenge-ideas">😈 Petty Revenge Idea Generator</a>
          <span>Hilariously harmless revenge ideas for life's minor annoyances. All legal. All petty. All satisfying.</span>
        </li>
        <li>
          <a href="tool.html?card=pomodoro-flow">⏱️ Pomodoro Flow Timer</a>
          <span>Level up your daily productivity with science-backed 25-minute focus intervals, audio finish chimes, streak tracking, and gamified XP rew…</span>
        </li>
        <li>
          <a href="tool.html?card=practice-tracker">🎯 Practice Tracker</a>
          <span>Track and analyze your practice sessions with detailed metrics and progress visualization. Set goals, track habits, and measure improvement.</span>
        </li>
        <li>
          <a href="tool.html?card=price-in-work-hours">⏱️ Price Tag in Hours of Your Life</a>
          <span>Money is frozen time. Convert any price into how many hours (and minutes) of your actual working life it costs — after tax, before snacks…</span>
        </li>
        <li>
          <a href="tool.html?card=print-dpi-photo-size-calculator">🖨️ Print Size & DPI Calculator</a>
          <span>Convert pixel dimensions to print size at a chosen DPI, or the other way around. 300 DPI is typical photo-lab quality; 150 DPI is fine fo…</span>
        </li>
        <li>
          <a href="tool.html?card=procrastination-justifier">🕐 Procrastination Justifier</a>
          <span>Scientifically* valid reasons why you should absolutely do that thing tomorrow instead. *Not scientifically valid.</span>
        </li>
        <li>
          <a href="tool.html?card=productivityscore">🚀 Productivity Score</a>
          <span>Calculate and analyze your daily productivity with detailed insights and actionable recommendations. Track progress and optimize your wor…</span>
        </li>
        <li>
          <a href="tool.html?card=projectdeadline">📅 Project Deadline Calculator</a>
          <span>Calculate project timelines with buffer days, weekend exclusions, and milestone planning. Plan realistically and track progress.</span>
        </li>
        <li>
          <a href="tool.html?card=prompt-architect">⚡ AI Prompt Studio</a>
          <span>Turn vague thoughts into high-performance AI prompts used by senior prompt engineers. Constructs rigorous prompts with Chain-of-Thought r…</span>
        </li>
        <li>
          <a href="tool.html?card=qr-code-generator">📱 QR Code Generator</a>
          <span>Generate QR codes instantly — all processing happens in your browser. No data leaves your device. Supports URLs, text, WiFi, email, and m…</span>
        </li>
        <li>
          <a href="tool.html?card=qr-code-reader-scanner">📷 Instant QR & Image Reader</a>
          <span>Decode QR codes instantly from uploaded screenshots, images, or your live camera feed. 100% private in-browser decoding — photos never le…</span>
        </li>
        <li>
          <a href="tool.html?card=qr">📊 Barcode Check Digit Validator</a>
          <span>Validate or generate the check digit for EAN-13, UPC-A, EAN-8, ISBN-13, ISBN-10, GTIN-14 and ITF-14 barcodes. Shows the arithmetic so you…</span>
        </li>
        <li>
          <a href="tool.html?card=qrtool">🔳 Advanced QR Generator</a>
          <span>Create professional QR codes with custom styling, analytics tracking, and bulk generation. Supports URLs, WiFi, contact cards, and dynami…</span>
        </li>
        <li>
          <a href="tool.html?card=quiz-maker">🧠 Quick Quiz Maker</a>
          <span>Create a multiple-choice quiz, then test yourself. Questions save to your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=quiz">🎯 Smart Quiz Generator</a>
          <span>Create custom quizzes, track progress, and test your knowledge. Perfect for studying, training, or self-assessment. Add multiple choice…</span>
        </li>
        <li>
          <a href="tool.html?card=random-number-dice-coin-generator">🎲 Random Number, Dice & Coin</a>
          <span>Roll dice, flip a coin or draw integers in a range. Uses the Web Crypto API when the browser has it, so results are suitable for raffles…</span>
        </li>
        <li>
          <a href="tool.html?card=random-number-dice-picker">🎲 Random Number, Dice & Name Picker</a>
          <span>Cryptographically random numbers in any range (with or without repeats), dice rolls in D&D notation like 3d6+2, coin flips, and a fair pi…</span>
        </li>
        <li>
          <a href="tool.html?card=random-number-generator">🎲 Random Number Generator</a>
          <span>Generate random numbers within any range. Supports integers, decimals, multiple values, and custom distributions.</span>
        </li>
        <li>
          <a href="tool.html?card=reading-timer">⏱️ Pace Reading Timer</a>
          <span>Time yourself reading a passage to measure your words-per-minute rate.</span>
        </li>
        <li>
          <a href="tool.html?card=reminder">⏰ Reminder Tool</a>
          <span>Create reminders that stay saved in your browser. Works offline — data saved locally.</span>
        </li>
        <li>
          <a href="tool.html?card=ring-size-converter">💍 Ring Size Converter</a>
          <span>Convert UK letters, US numbers, EU/ISO circumference and inner diameter. Based on a circular inside; wide bands often need a half-size up…</span>
        </li>
        <li>
          <a href="tool.html?card=schengen-90-180-day-calculator">🇪🇺 Schengen 90/180 Calculator</a>
          <span>Short-stay visitors can spend 90 days in any rolling 180-day window in the Schengen area (unless a visa or residence permit says otherwis…</span>
        </li>
        <li>
          <a href="tool.html?card=screen-ppi-calculator">🖥️ Screen PPI Calculator</a>
          <span>Pixels per inch from diagonal size and resolution. Also shows pixel pitch, aspect ratio and whether the display is “Retina” at a typical…</span>
        </li>
        <li>
          <a href="tool.html?card=screen-ruler-pixel-measure">📏 On-Screen Ruler & Pixel-to-Physical Converter</a>
          <span>Turn your screen into a ruler. Calibrate once with a bank card (85.6 mm wide) or by entering your screen's diagonal size, then measure re…</span>
        </li>
        <li>
          <a href="tool.html?card=screen-ruler">📏 Screen Ruler & Pixel Measure</a>
          <span>Measure pixels on your screen. Drag rulers, measure distances, and get precise pixel coordinates.</span>
        </li>
        <li>
          <a href="tool.html?card=secret-santa">🎁 Secret Santa Generator</a>
          <span>Organize a perfect Secret Santa gift exchange with automatic matching, restrictions, and wish lists! ✅ Supports: Family restrictions, wis…</span>
        </li>
        <li>
          <a href="tool.html?card=shoe-size-converter">👟 Shoe Size Converter</a>
          <span>Convert adult shoe sizes between US, UK, EU and Mondopoint (mm). Based on standard last-length charts — brands still vary by a half size…</span>
        </li>
        <li>
          <a href="tool.html?card=shoppinglist">🛒 Smart Shopping List</a>
          <span>Add items, organize by category, track quantities, and manage your shopping efficiently. ✅ Features: Categories, quantity tracking, budge…</span>
        </li>
        <li>
          <a href="tool.html?card=social-preview">🖼️ Social Preview Generator</a>
          <span>Create perfectly sized Open Graph and Twitter preview images with custom branding, layouts, and auto-generated HTML meta tags.</span>
        </li>
        <li>
          <a href="tool.html?card=sprite-cutter">🎮 Sprite Sheet Studio</a>
          <span>Advanced sprite sheet cutter for game developers. Slice, preview, animate, and export sprite sheets with professional tools. ✨ Supports P…</span>
        </li>
        <li>
          <a href="tool.html?card=stopwatch-lap-interval-timer">⏱️ Precision Split Stopwatch & HIIT Interval Timer</a>
          <span>Millisecond-accurate lap stopwatch with split deltas, exportable lap times, and customizable HIIT / Tabata workout interval timer with au…</span>
        </li>
        <li>
          <a href="tool.html?card=stopwatch-timer">⏱️ Stopwatch & Lap Timer</a>
          <span>Precision stopwatch with lap tracking. Record split times, compare laps, and export your data.</span>
        </li>
        <li>
          <a href="tool.html?card=studyplanner">📚 Study Planner</a>
          <span>Plan your study sessions, track progress, and stay focused with a built-in Pomodoro timer. All data saved locally in your browser.</span>
        </li>
        <li>
          <a href="tool.html?card=svg-path-visualizer-editor">📐 SVG Path Visualizer</a>
          <span>Inspect, edit, and optimize SVG path data (d="...") in real time. Visualizes anchor nodes, control handles, bounding box, and minified code.</span>
        </li>
        <li>
          <a href="tool.html?card=taskprioritizer">📋 Task Prioritizer Matrix</a>
          <span>Use the Eisenhower Matrix to prioritize tasks by urgency and importance. Based on the time management framework.</span>
        </li>
        <li>
          <a href="tool.html?card=text-to-ascii-art">🎨 Text to ASCII Art</a>
          <span>Convert text into ASCII art using various fonts. Perfect for terminal banners, README files, and fun messages.</span>
        </li>
        <li>
          <a href="tool.html?card=thing-namer-generator">🏷️ The Thing Namer</a>
          <span>Naming things is one of the two hard problems in computer science (along with cache invalidation and off-by-one errors). Point it at a th…</span>
        </li>
        <li>
          <a href="tool.html?card=thumbnail-generator">🖼️ Universal Thumbnail Generator</a>
          <span>Generate perfectly sized thumbnails for any platform with advanced editing tools. No upload required - all processing happens locally.</span>
        </li>
        <li>
          <a href="tool.html?card=tic-tac-toe">🎮 Tic Tac Toe Game</a>
          <span>Play Tic Tac Toe against the computer or a friend. Features three difficulty levels and game statistics. Classic strategy game reimagined.</span>
        </li>
        <li>
          <a href="tool.html?card=timelapse-interval-calculator">⏱️ Timelapse Interval</a>
          <span>Shots needed = clip length × frame rate. Real time covered = shots × interval. Leave the battery and a bigger card than you think. Sunset…</span>
        </li>
        <li>
          <a href="tool.html?card=timer">⏱️ Advanced Timer & Stopwatch</a>
          <span>Advanced timer with countdown, stopwatch, intervals, lap times, and multiple alarms. Perfect for workouts, cooking, study sessions, and p…</span>
        </li>
        <li>
          <a href="tool.html?card=timezone">🌍 Time Zone Converter</a>
          <span>Convert any date and time between time zones. Supports all major world time zones.</span>
        </li>
        <li>
          <a href="tool.html?card=tipcalculator">💸 Tip & Split Calculator</a>
          <span>Calculate tips, split bills, and see exactly how much everyone owes. Supports multiple currencies!</span>
        </li>
        <li>
          <a href="tool.html?card=tire-size-comparison-calculator">🛞 Tyre Size Comparison</a>
          <span>Compare two metric tyre sizes (e.g. 225/45R17 vs 235/40R18): overall diameter, circumference, sidewall and the speedometer error if you s…</span>
        </li>
        <li>
          <a href="tool.html?card=travel">✈️ Travel Trip Planner</a>
          <span>Plan your perfect trip with detailed itineraries, budget tracking, and smart recommendations. Get personalized suggestions based on your…</span>
        </li>
        <li>
          <a href="tool.html?card=uk-postcode-formatter">📮 UK Postcode Formatter</a>
          <span>Uppercase, insert the inward-code space, and check the Royal Mail pattern (e.g. LU1 2AB, EC1A 1BB, W1A 0AX). This is a format check only…</span>
        </li>
        <li>
          <a href="tool.html?card=universal-thumbnail-maker">🖼️ Thumbnail Preview Tool</a>
          <span>Upload an image and preview it as a 16:9 thumbnail. Adjust brightness, contrast, and add overlay text.</span>
        </li>
        <li>
          <a href="tool.html?card=unix-timestamp-epoch-converter">⏱️ Unix Timestamp Converter</a>
          <span>Convert Unix epoch timestamps (seconds, milliseconds, microseconds or nanoseconds — auto-detected) to human dates and back. Shows UTC, yo…</span>
        </li>
        <li>
          <a href="tool.html?card=what-year-are-you">Which Year Are You? 🕰️</a>
          <span>Discover your internet personality era based on your tastes, habits, and vibes. ← Share your result!</span>
        </li>
        <li>
          <a href="tool.html?card=wifi-qr-generator">📶 Wi-Fi QR Pass Generator</a>
          <span>Generate an instant, scannable QR code for your home, studio, or office Wi-Fi network. Guests can scan with their phone camera to connect…</span>
        </li>
        <li>
          <a href="tool.html?card=word-counter">📝 Word Counter & Analyser</a>
          <span>Count words, characters, sentences, and estimate reading time. Useful for essays and assignments.</span>
        </li>
        <li>
          <a href="tool.html?card=workhours">⏱️ Work Hours & Pay Calculator</a>
          <span>Calculate work hours, breaks, overtime, and pay. Track multiple shifts, different pay rates, and generate detailed timesheets. Perfect fo…</span>
        </li>
        <li>
          <a href="tool.html?card=worry-sorter-3am">🌙 The 3am Worry Sorter</a>
          <span>For the thoughts that queue up at 3am. Tick what's rattling around, add your own, and this will sort each one into Do Now, Schedule, or L…</span>
        </li>
        <li>
          <a href="tool.html?card=xmas-card-writer-assistant">✍️ XMAS Card Writer Assistant</a>
          <span>Struggling with what to write? Get personalized Christmas card messages for everyone on your list! Save time, spread joy!</span>
        </li>
        <li>
          <a href="tool.html?card=xmas-countdown">🎄 Christmas Countdown</a>
          <span>Count down to Christmas with real-time tracking, festive facts, and daily suggestions! 🎅 Shows days, hours, minutes until Christmas morning</span>
        </li>
        <li>
          <a href="tool.html?card=xmas-santa-tracker">🎅 Santa Tracker & Message Center</a>
          <span>Track Santa's journey and send him a message! Get a personalized response from the North Pole. Perfect for kids and kids-at-heart!</span>
        </li>
        <li>
          <a href="tool.html?card=youth-color-palette">🎨 Aesthetic Color Palette Generator</a>
          <span>Generate beautiful color palettes for designs, social media, and vibes — click to copy hex codes</span>
        </li>
        <li>
          <a href="tool.html?card=youth-playlist-name">🎵 Playlist Name Generator</a>
          <span>Generate creative playlist names for Spotify, Apple Music, and YouTube — match the vibe of your music</span>
        </li>
        <li>
          <a href="tool.html?card=youth-study-timer">📚 Study Timer (Pomodoro)</a>
          <span>Focus timer with study/break cycles, session tracking, and motivational quotes — ace your exams</span>
        </li>
        <li>
          <a href="tool.html?card=youth-username-generator">🎮 Username Generator</a>
          <span>Generate unique, cool usernames for gaming, social media, and streaming — check availability vibes</span>
        </li>
        <li>
          <a href="tool.html?card=youth-what-to-watch">🎬 What Should I Watch?</a>
          <span>Can't decide what to watch? Answer 3 quick questions and get personalized movie/show recommendations</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="virtual-worlds-and-gaming">
      <h2>🎮 Virtual Worlds & Gaming <span class="count">20 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=polyhedral-dice-3d-roller">🎲 Polyhedral Dice 3D Roller</a>
          <span>Real tumbling 3D dice — D4 through D20 — rendered as true platonic solids. The die physically rotates so your rolled face lands front-and…</span>
        </li>
        <li>
          <a href="tool.html?card=raycast-pocket-dungeon">🗝️ Raycast Pocket Dungeon</a>
          <span>A Wolfenstein-style 3D dungeon in pure maths — no game engine. Procedurally generated maze, glowing orb collectibles, a portal exit, mini…</span>
        </li>
        <li>
          <a href="tool.html?card=second-life-surnames-guide">📚 Second Life Surnames Encyclopedia</a>
          <span>Explore the rich tapestry of Second Life surnames. Discover origins, cultural associations, and roleplay inspiration. A living encycloped…</span>
        </li>
        <li>
          <a href="tool.html?card=sl-avatar-height-calculator">📏 SL Avatar Height & Proportion Calculator</a>
          <span>Calculate your avatar's true height, body proportions, and get recommendations for realistic or stylized looks</span>
        </li>
        <li>
          <a href="tool.html?card=sl-buildmate">🏗️ Second Life Builder's Mate</a>
          <span>Professional toolkit for Second Life builders: prim allowance, object sizing, weight calculation, grid alignment, and LOD optimization. ✅…</span>
        </li>
        <li>
          <a href="tool.html?card=sl-events">📅 Live Second Life Events</a>
          <span>🟢 LIVE Real-time events from Second Life. Updates automatically.</span>
        </li>
        <li>
          <a href="tool.html?card=sl-exchange">💰 Linden Dollar Exchange</a>
          <span>Convert Linden Dollars (Second Life virtual currency) to real-world currencies using market rates. Rates are estimates — actual exchange…</span>
        </li>
        <li>
          <a href="tool.html?card=sl-group-slot-calculator">👥 SL Group Slot Calculator</a>
          <span>Track your group memberships — manage the 42-group limit and plan which groups to keep or drop</span>
        </li>
        <li>
          <a href="tool.html?card=sl-land-tier-calculator">🏠 SL Land Tier Calculator</a>
          <span>Calculate monthly tier costs, prim budgets, and land area — for mainland, private regions, and homesteads</span>
        </li>
        <li>
          <a href="tool.html?card=sl-linden-dollar-converter">💵 L$ Linden Dollar Converter</a>
          <span>Convert between Linden Dollars (L$) and real-world currencies — USD, GBP, EUR, JPY, AUD, CAD</span>
        </li>
        <li>
          <a href="tool.html?card=sl-lsl-script-generator">📜 LSL Script Generator</a>
          <span>Generate ready-to-use Linden Scripting Language scripts — security, teleport, dance, auto-response, and more</span>
        </li>
        <li>
          <a href="tool.html?card=sl-market">🛒 Second Life Marketplace Search</a>
          <span>Search and browse Second Life Marketplace items. Demo data shown — in production, connect to actual Marketplace API.</span>
        </li>
        <li>
          <a href="tool.html?card=sl-mesh-upload-cost">🔺 SL Mesh Upload Cost Calculator</a>
          <span>Estimate Land Impact and upload cost for mesh objects — input triangle counts and physics shapes</span>
        </li>
        <li>
          <a href="tool.html?card=sl-outfit-planner">👗 SL Outfit Planner</a>
          <span>Plan and organize your Second Life outfits — track body parts, clothing layers, accessories, and color coordination</span>
        </li>
        <li>
          <a href="tool.html?card=sl-prim-budget-planner">🧱 SL Prim Budget Planner</a>
          <span>Plan your land's prim usage — add objects, track LI (Land Impact), and stay within your budget</span>
        </li>
        <li>
          <a href="tool.html?card=sl-region-map">🗺️ Second Life Region Map</a>
          <span>View Second Life region maps with interactive pan/zoom, coordinates, and debugging tools. Uses multiple data sources with automatic fallb…</span>
        </li>
        <li>
          <a href="tool.html?card=sl-teleport-planner">🌀 SL Teleport & SLURL Planner</a>
          <span>Build teleport notecards, generate SLURLs, and plan region visits with coordinate calculations</span>
        </li>
        <li>
          <a href="tool.html?card=sl-texture-cost-calculator">🖼️ SL Texture Upload Cost Calculator</a>
          <span>Calculate upload costs, memory usage, and get recommendations for optimal texture sizes in Second Life</span>
        </li>
        <li>
          <a href="tool.html?card=sl-texture">🖼️ Second Life Texture Tool</a>
          <span>Calculate texture repeats, offsets, and rotations for Second Life prims. Perfect alignment for builders and creators. Works with any text…</span>
        </li>
        <li>
          <a href="tool.html?card=sl-time-converter">🕐 SL Time Converter</a>
          <span>Convert between Second Life Time (SLT/PST) and your local time — never miss an event again</span>
        </li>
      </ul>
    </section>

    <section class="cat" id="museum-and-collection">
      <h2>🏛️ Museum & Collection <span class="count">30 tools</span></h2>
      <ul>
        <li>
          <a href="tool.html?card=ancient-egypt-quiz">🐫 Ancient Egypt Quiz</a>
          <span>Test your knowledge of ancient Egypt — pharaohs, pyramids, gods and everyday life — in ten-question rounds with streaks.</span>
        </li>
        <li>
          <a href="tool.html?card=architectural-orders-column">🏛️ The Orders Bench</a>
          <span>Vitruvius counted in modules: the lower diameter of the column. Doric is stocky, Corinthian tall and leafy, Ionic the volute in between…</span>
        </li>
        <li>
          <a href="tool.html?card=bayes-chance-hall">🧠 The Bayes Workshop</a>
          <span>Conditional probability you can feel: what a positive test really means (Bayes' theorem), a 300-game Monty Hall simulation, and the prose…</span>
        </li>
        <li>
          <a href="tool.html?card=british-monarchs-quiz">👑 British Monarchs Quiz</a>
          <span>Name the kings and queens of England, Scotland and the UK from 1066 to today — ten questions per round with streaks.</span>
        </li>
        <li>
          <a href="tool.html?card=british-regnal-years">👑 The Regnal Desk</a>
          <span>English and British legal years used to be counted from the accession, not 1 January. “3 Geo. III” is the third year of George III’s reig…</span>
        </li>
        <li>
          <a href="tool.html?card=constant-treasury">📐 The Constant Treasury</a>
          <span>The constants that run the universe, as numbered exhibits — provenance, exact or measured, and what each does. Includes a live pi engine…</span>
        </li>
        <li>
          <a href="tool.html?card=daylight-room-simulator">☀️ The Daylight Lab</a>
          <span>Watch sunlight enter a room and cast shadows as the sun moves across the sky. See how window orientation, room depth, and time of year af…</span>
        </li>
        <li>
          <a href="tool.html?card=deep-time-museum">🏛️ Deep Time Museum</a>
          <span>Walk 4.6 billion years of Earth's story in one scroll — Hadean to Holocene, an era per hall, with an Earth-in-one-day clock, jump-chips a…</span>
        </li>
        <li>
          <a href="tool.html?card=dewey-decimal-classifier">📚 The Dewey Stacks</a>
          <span>Melvil Dewey, 1876: knowledge in ten main classes, each split by tens. Museums and small libraries still live by it. Search a word or tap…</span>
        </li>
        <li>
          <a href="tool.html?card=dinosaur-scale-hall">🦕 The Scale Hall</a>
          <span>Lengths and masses as the casts in the hall give them — mid-range figures from the current literature, not movie posters. Enter your heig…</span>
        </li>
        <li>
          <a href="tool.html?card=egyptian-hieroglyph-alphabet">𓂀 The Uniliteral Case</a>
          <span>The twenty-four single-consonant signs every student copies first — Gardiner’s teaching alphabet. Vowels were not written. Type a name; t…</span>
        </li>
        <li>
          <a href="tool.html?card=element-hall">⚗️ The Element Hall</a>
          <span>All 118 elements as numbered museum exhibits: discovery year, discoverers, name origin, category, state at room temperature — plus curato…</span>
        </li>
        <li>
          <a href="tool.html?card=energy-watt-exchange">⚡ The Watt Exchange</a>
          <span>Energy literacy in the only currency that needs no conversion: bananas, stairs and phone charges. Decode any item, your monthly meter, an…</span>
        </li>
        <li>
          <a href="tool.html?card=heraldry-blazon-workshop">🛡️ The Blazon Workshop</a>
          <span>A teaching coat, not a grant. Choose a field, an ordinary and a charge. The plaque writes the blazon in the old word-order: metal or colo…</span>
        </li>
        <li>
          <a href="tool.html?card=hominin-timeline-hall">🧬 The Hominin Corridor</a>
          <span>Not a ladder. A bush of species, several of which overlapped. Brain volumes are typical adult means; dates are first-to-last fossil appea…</span>
        </li>
        <li>
          <a href="tool.html?card=japanese-era-nengo">🏯 The Nengō Desk</a>
          <span>Japanese objects are dated in era years: Meiji 6, Shōwa 20, Reiwa 6. Year 1 of an era is the year it was proclaimed, even if that was Dec…</span>
        </li>
        <li>
          <a href="tool.html?card=latin-date-kalends-nones">📜 The Kalends Desk</a>
          <span>Romans counted forward to the next named day, inclusively. The named days are the Kalends (1st), the Nones (5th, or 7th in Mar/May/Jul/Oc…</span>
        </li>
        <li>
          <a href="tool.html?card=mohs-hardness-gallery">💎 The Mohs Gallery</a>
          <span>Friedrich Mohs, 1812: a mineral of higher number scratches one of lower number. The steps are not equal — corundum to diamond is a canyon…</span>
        </li>
        <li>
          <a href="tool.html?card=moisture-capillary-simulator">🧪 The Moisture Lab</a>
          <span>Watch water migrate through building materials via capillary action — the same force that makes a sponge soak up water and makes your wal…</span>
        </li>
        <li>
          <a href="tool.html?card=museum-tombstone-label">🏷️ The Tombstone Desk</a>
          <span>The quiet rectangle beside the object. In Anglo-American practice: maker, dates, title in italics, date of work, medium, dimensions, cred…</span>
        </li>
        <li>
          <a href="tool.html?card=pigment-cabinet-of-colour">🎨 The Pigment Cabinet</a>
          <span>Colour as a dated substance. Each pot is a first-use, a chemistry, and a verdict: still on the palette, replaced, or locked in the poison…</span>
        </li>
        <li>
          <a href="tool.html?card=pipe-flow-simulator">💧 The Pipe Lab</a>
          <span>Watch water flow through pipes in real time. See Bernoulli's principle in action — where the pipe narrows, water speeds up and pressure d…</span>
        </li>
        <li>
          <a href="tool.html?card=roman-coin-denominations">🪙 The Coin Room</a>
          <span>Early Imperial bronze and silver, counted in asses. 4 asses = 1 sestertius; 4 sestertii = 1 denarius; 25 denarii = 1 aureus. A legionary…</span>
        </li>
        <li>
          <a href="tool.html?card=room-acoustics-simulator">🔊 The Echo Chamber</a>
          <span>Watch sound bounce around a room in real time. See wavefronts propagate from a source, reflect off walls, and decay as materials absorb t…</span>
        </li>
        <li>
          <a href="tool.html?card=seven-wonders-hall">🏺 The Seven Wonders</a>
          <span>A Hellenistic tourist list, not a league table. Antipater of Sidon and others named seven sights a traveller from the Mediterranean might…</span>
        </li>
        <li>
          <a href="tool.html?card=statistics-illusion-gallery">🎭 The Illusion Gallery</a>
          <span>Three statistical traps you can run with your own eyes: survivorship bias (the WW2 planes), Simpson's paradox (the kidney-stone study whe…</span>
        </li>
        <li>
          <a href="tool.html?card=structural-beam-stress">🏗️ The Stress Gallery</a>
          <span>Apply loads to a beam and watch stress propagate in real time. See shear force and bending moment diagrams update live. The colour map sh…</span>
        </li>
        <li>
          <a href="tool.html?card=thermal-wall-simulator">🧱 The Thermal Wall</a>
          <span>Watch heat flow through building materials in real time. A thermal wave propagates from a warm room through brick, insulation, glass or w…</span>
        </li>
        <li>
          <a href="tool.html?card=uk-hallmark-decoder">🥈 The Hallmark Bench</a>
          <span>British silver and gold are punched with a standard, a town, a maker, and (historically) a date letter. The bench identifies the town mar…</span>
        </li>
        <li>
          <a href="tool.html?card=younger-futhark-runes">ᚠ The Rune Cabinet</a>
          <span>Sixteen staves, not twenty-four. After about 700 CE the north dropped Elder Futhark down to this tighter case — one rune now stands for s…</span>
        </li>
      </ul>
    </section>

  
  </main>
</body>
</html>