What changed, and when

RSS feed refresh + blog launch Feature SEO

RSS feed updated with blog posts, embed page, and other new pages. New /blog/ hub with three long-form, math-honest guides:

• How mortgage payments really work — the formula, the bank's blind spots, and the one number they never show.
• What BMI actually measures — a population screening tool, not a personal one.
• Why compound interest is magic — the rule of 72, and why the early saver always wins.

Each post has Article JSON-LD, a sticky topbar, a related-tools grid, and links back into the catalogue. Cross-linked from the home page's top nav and footer pills.

Human-readable sitemap Feature SEO

New /sitemap.html page: every page on the site, every tool, every translated landing, every machine-readable file, in one place. Easier for users to navigate, easier for crawlers to discover.

11 broken slugs fixed Fix

/popular had 11 references to tool slugs that don't exist (favicon, UUID generator, and others). All replaced with the actual closest tools in the catalogue. Every tool link on the site now resolves to a real tool.

Related-tools map Feature

New /related.json file with computed related-tools for all 1164 tools, ranked by category + title keyword overlap + description word overlap. The /tool.html standalone viewer now uses the map to show 5 contextually related tools at the bottom of every page (falls back to same-category if the map is unavailable).

Sticky top nav on the home page Feature

The home page now has a sticky top nav with links to all 10 discovery / structural pages: Popular, New, Use case, Index, Embed, Help, About, Music, Donate, Changelog. Sits at the top of the viewport on every scroll position.

Embed any tool Feature

New /embed page that lists all 1164 tools with a one-click "Copy iframe" button. Filter by category. Every tool can be embedded on a third-party site with a single iframe — no JavaScript, no API key, no sign-up.

• Per-tool embed snippet generated client-side; the snippet is live in the page when copied so it can be inspected before pasting.
• Category filter with sticky position under the topbar.
• Old-browser fallback: shows the snippet inline if navigator.clipboard is unavailable.

About + Press Feature

New /about page with project history, principles, stats, and milestones. New /press page with a one-paragraph factsheet, story angles for tech / consumer / music / indie press, contact details, and brand-asset notes.

• Both pages include structured data (AboutPage, WebPage JSON-LD) for E-E-A-T and rich-result eligibility.
• Cross-linked from every other top-level page in the footer pill row.

Use case + per-tool JSON-LD Feature SEO

New /use-case page with 33 hand-curated "what are you trying to do?" buckets covering 271 of the 1164 tools — the rest are still discoverable from /tools and /.

Every tool loaded via /tool.html?card=... now injects its own per-tool WebApplication JSON-LD with the actual title, description, category, and the canonical standalone URL — replacing the generic placeholder. The page's <title>, og:title, og:description, twitter:*, and <link rel="canonical"> are all updated to match.

Discovery pages + RSS + machine-readable Feature SEO

Four new discovery pages, one feed, three machine-readable files.

• /popular — 60 hand-curated "most useful" tools across 7 categories, with ItemList JSON-LD for the top 30.
• /new — the 10 tools added in the most recent catalogue-audit commit.
• /tools — the complete index of all 1164 tools organised by category, with a sticky in-page TOC.
• /help — 20-question FAQ with FAQPage JSON-LD, sticky section nav, and a "suggest a tool" CTA.
• /feed.xml — RSS 2.0 feed with items for each of the above.
• /llms.txt — machine-readable overview for LLM crawlers (per the llmstxt.org spec).
• /.well-known/ai.txt — explicit AI policy (training, retrieval, republishing rules).
• /.well-known/security.txt — security disclosure address and expiry.
• /robots.txt now explicitly allows the major AI crawlers (GPTBot, Claude-Web, ClaudeBot, anthropic-ai, PerplexityBot, Google-Extended, CCBot, Applebot-Extended, cohere-ai, cohere-training-data-crawler).
• Every top-level page links to the RSS feed via <link rel="alternate" type="application/rss+xml">.

+10 tools, 23 categories, 562 total Content

After a full audit of the 552-tool catalogue, ten genuine coverage gaps were found and filled:

• Hike Time Planner — Naismith + Langmuir descent + real sunset times from your latitude. (Home & DIY)
• Bike Gear Calculator — gear inches, development, gain ratio, wheel duplicates. (Health & Fitness)
• Photo Exposure Lab — EV equivalence, ND, true DOF (not the marketing version), diffraction limit. (Science & Engineering)
• Race Pace Predictor — Riegel predictions for any distance, plus five training paces. (Health & Fitness)
• Baby Sleep Planner — wake windows → nap length → bedtime, by age band. (Productivity & Lifestyle)
• Energy Tariff Comparator — annual cost AND the usage where ranking flips. (Finance & Money)
• Unit Price Comparator — normalises multi-buys to a single comparable number. (Finance & Money)
• Fluid Type Scale — CSS clamp() solved from two breakpoints, in rem. (Productivity & Lifestyle)
• Fabric Yardage Estimator — width, nap, pattern repeat, pre-wash shrinkage. (Science & Engineering)
• Car Care Tracker — MOT + service countdowns, tread, cost per mile. (Science & Engineering)

Spread across 5 existing categories (no new category invented for these). The full cards.json is regenerated; the other 552 cards have zero drift.