💼 SaaS & Business Killers Tools

The two numbers every experiment platform charges you to see: is this difference real, and how long must the test run? Frequentist z-test with confidence intervals, a proper sample-size and duratio...

Generate high-converting 4-touch B2B cold email sequences. Features real-time spam keyword detection and an inbox deliverability health score. Replaces expensive monthly sales automation subscripti...

Produce real, scanner-readable barcodes — Code 128, Code 39, EAN-13, UPC-A and ITF-14 — and download them as vector SVG or a print-resolution PNG. Barcode generator sites charge a subscription for ...

Design a real logo in the browser and leave with the vector file. Twenty-two hand-drawn icons, five type treatments, four container shapes, gradient or flat colour, and exports as SVG, a 1024px PNG...

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 Canvas, get prompted when a block is too thin to be true, and...

Type one or two words that describe what you do and get a few dozen names built from the tricks naming agencies actually use — blends, compounds, prefixes, suffixes, alliteration and invented words...

The offline PandaDoc / HoneyBook killer — build a branded quote, invoice or proposal, add your terms, collect a legally-binding drawn e-signature, and export a print-ready PDF. Payment link, QR, au...

Paste any contract, terms of service or NDA and get an instant risk map — plain-English summary, red flags, missing protections and a clause-by-clause fix list. Replaces LegalZoom contract review (...

Build a self-hosted cookie banner with real accept / reject / granular choices — the thing Cookiebot, OneTrust and Termly charge a monthly fee for, and the thing most "free" generators only half do...

Preview common CSS keyframe animations, tune duration, delay and easing, then copy a small standalone animation block. The preview honours reduced-motion preferences; use motion as polish, never as...

Shape a card, button or image frame with four independent corner radii, preview the result and copy the compact CSS shorthand. Switch between pixels and percentages, link corners while you explore,...

Tune a CSS box-shadow visually, choose a colour and opacity, test inset mode and copy production-ready CSS. The preview updates as you move the controls, so there is no design account or upload step.

Combine brightness, contrast, saturation, hue, blur and monochrome effects with a live visual preview, then copy one filter declaration. Useful for hero images, hover states and quick image treatme...

Explore real flexbox controls side by side: direction, wrapping, gap and alignment update the preview immediately, then a copyable CSS block records the exact settings. Use it to build nav rows, ce...

Build a responsive CSS Grid visually: set tracks, gap, flow and item alignment, optionally make one card span multiple cells, then copy the CSS. The preview uses real grid properties and runs entir...

Paste a spreadsheet, get a clean dataset. Parses CSV/TSV, detects the delimiter, profiles every column, cleans the rows, and re-exports as JSON, SQL, Markdown, XML or HTML. Nothing is uploaded — th...

Assemble a safe-to-copy cURL command from a URL, method, headers and optional request body. It quotes shell values correctly and never sends the request itself, so you can prepare API calls private...

Build an email signature that survives Gmail, Outlook and Apple Mail, then copy it with formatting intact and paste straight into your mail client. Table-based layout, inline styles only, no script...

Preview how a subject line and preheader may truncate on mobile or desktop, check length and punctuation, and get practical editing prompts. This is a transparent writing heuristic — not a delivera...

Turn a set of chapters into a real EPUB 3 file your reader can actually open — the job Vellum charges a couple of hundred pounds for and Designrr sells as a subscription. Write in plain text with l...

Make a sharp, lightweight vector favicon from initials or one emoji, tune its colours and shape, then download a ready-to-use SVG. It also gives you the HTML link tag and a data URI — no image uplo...

Draw a real project timeline — tasks, dates, progress, milestones and dependencies — and export it as a clean SVG or a print-resolution PNG. TeamGantt and Microsoft Project charge per user per mont...

Generate legally-compliant Privacy Policies for websites, mobile apps, SaaS, and e-commerce stores. Includes GDPR, CCPA/CPRA, cookie consent, and third-party processor disclosures without paying re...

Turn a quick list of headers and rows into accessible, escaped HTML table markup with a live preview. Paste pipe- or comma-separated data, add an optional caption, and copy code that works cleanly ...

Batch-shrink photos and screenshots without uploading a single byte. Drop files in, pick a target size and format, and watch the real compressed file size update as you move the quality slider. Exp...

Calculate when to reorder stock using sales velocity, supplier lead time and safety stock. All calculations stay in your browser.

Generate clean, client-ready invoices with zero watermarks. Calculates multi-currency line items, tax, discounts, and payment terms with 1-click browser print to PDF. Instant browser-based invoicin...

Build valid schema.org JSON-LD for the rich results Google actually shows — products with price and availability, FAQs, breadcrumbs, events, local businesses, articles. Fields are validated as you ...

Paste any JSON response and get production-ready types in six dialects at once: TypeScript interfaces, a Zod schema, Python dataclasses, Go structs, C# classes and a JSON Schema document. Nested ob...

Build the one-page hub you put in your social bio and download it as a single self-contained HTML file you can host anywhere for free. Linktree charges a monthly fee for themes, analytics and remov...

One-tap background removal, chroma key, edge feathering and 2×/4× upscaling — the offline replacement for remove.bg & Let's Enhance. Flood-fill magic wand, color distance, and canvas compositing. E...

Write a presentation as plain text and present it from the browser. Split slides with ---, get a live thumbnail rail, speaker notes, a run timer and full-screen mode, then export a single self-cont...

Track real-time company salary burn during meetings. Keep discussions focused, respect employee time, and visualize the true cost of every minute.

Create repeatable sample customer, product or analytics-event datasets as JSON, CSV or SQL inserts. Names and example.test emails are deliberately fictional, so you can prototype safely without upl...

Generate legally-binding Non-Disclosure Agreements (NDA) and Independent Contractor Service Agreements. Customize IP assignment, confidentiality duration, non-solicitation, and jurisdiction with ze...

Premium-grade PDF studio that replaces Smallpdf / Adobe Acrobat for everyday jobs — 100% offline, no uploads, no watermarks. Merge, split by pages, compress images → PDF, and extract text. Uses you...

Stamp a logo or a text signature across a whole folder of photos in one pass — tiled, angled and faded so it survives a crop but does not ruin the picture. Desktop watermark apps charge a licence a...

Professional audio workstation that replaces Audacity, Adobe Audition & Descript — 100% offline. Record mic, import audio/video, visualize waveform, trim, normalize, fade, adjust gain/speed, and ex...

Professional color system that replaces Coolors, Adobe Color & Stark — 100% offline. Extract palette from any image via k-means, generate harmonies, test WCAG contrast, simulate color blindness, bu...

Professional database studio that replaces Airtable $20/mo, Notion Database & Coda — 100% offline. Spreadsheet grid with types (text, number, select, checkbox, date, formula), filters, sort, views ...

Professional drag-drop design studio that replaces Canva Pro $13/mo, Adobe Express & Figma — 100% offline. Templates for YouTube thumbnail, Instagram post/story, OG image, poster, with layers, text...

Professional document scanner that replaces Adobe Scan, CamScanner & OnlineOCR — 100% offline in browser. Scan images, enhance, crop/rotate, OCR via built-in engine, export PDF/TXT, batch processin...

Professional email builder that replaces BeeFree $30/mo, Mailchimp builder & Stripo — 100% offline. Drag blocks, edit copy, inline CSS, dark mode, mobile/desktop preview, spam score, export HTML. N...

Professional spaced repetition studio that replaces Anki $25 & Quizlet Plus $36/yr — 100% offline. Create decks, import CSV, study with SM-2 algorithm, bury/leech detection, stats, heatmap, export....

Professional form builder that replaces Typeform $25/mo, Tally & Google Forms — 100% offline. Drag-drop fields, validation, logic, themes, collect responses in localStorage, export CSV/JSON, embed ...

Production-grade image studio that replaces TinyPNG, Squoosh & Photoshop batch — 100% offline. Batch compress, resize, convert to WebP/JPEG/PNG, strip EXIF, add watermark, and download. No uploads,...

Production invoicing studio that replaces FreshBooks, HoneyBook & Stripe Invoicing — 100% offline. Create invoices, estimates, recurring subscriptions, track paid/overdue, taxes, discounts, multi-c...

Production-grade JSON studio that replaces Quicktype, JSONPath Online & Postman scratchpad — 100% offline. Format, validate, minify, query with JSONPath, diff, convert to YAML/CSV/XML/TypeScript/Py...

Professional landing page builder that replaces Carrd $19/yr, Webflow $14/mo & Framer — 100% offline. Drag sections (hero, features, pricing, FAQ, CTA), edit copy, themes, responsive preview, expor...

Military-grade password manager that replaces 1Password / Bitwarden for local use — 100% offline, zero-knowledge. Generate high-entropy passwords, check strength, store in AES-GCM vault locked by m...

Professional regex workbench that replaces Regex101, RegExr & Debuggex — 100% offline. Live highlighting, match groups table, replace preview, explainer, cheatsheet, common-pattern library, and exp...

Professional SEO auditor that replaces Screaming Frog, Ahrefs Site Audit & Yoast — 100% offline. Paste HTML or enter URL, get 40+ checks: title, meta, headings, images alt, OG, Twitter, canonical, ...

Professional browser video studio that replaces HandBrake, Kap, EZGIF & Adobe Media Encoder — 100% offline. Trim, compress preview, extract frames, generate thumbnails, GIF preview, mute, rotate, m...

Professional infinite whiteboard that replaces Miro $10/mo, FigJam & Mural — 100% offline. Pan, zoom, sticky notes, freehand drawing, shapes, connectors, text, image upload, layers, export PNG/SVG/...

Paste any resume + job description and get an instant ATS score, keyword gaps, formatting traps and a line-by-line fix list. Replaces JobScan Premium ($50/mo) — 100% offline, no upload, no AI API. ...

Check whether monthly client retainers fit your available hours and reveal effective revenue per hour. All calculations stay in your browser.

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 a local generator, not a crawler: it never visits or upload...

Model recurring revenue lost to churn and the customers needed to maintain or grow monthly revenue. All calculations stay in your browser.

Calculate core SaaS unit economics, Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), payback period, and cash burn runway. Replaces expensive subscription analytics dashboards.

Record your screen, your webcam, or your webcam as a picture-in-picture over your screen — free, unlimited and watermark-free. Loom puts recording length and viewer counts behind a plan and Screenc...

Encrypt a message or a file with AES-256-GCM using a passphrase only you know, then hand over something that is meaningless without it. Password managers charge a subscription to hold notes like th...

Generate and preview Open Graph, Twitter Cards, and SEO meta tags in real time. Simulate Google SERP snippets and social media feed cards before deploying. Replaces expensive monthly SEO subscripti...

Sign with a mouse, a finger or a stylus — the line thickens as you slow down, the way a real pen does — or type your name and get a script version. Save it as a transparent PNG to drop into a docum...

Crop and export pixel-perfect images for every social media network directly in your browser. 100% client-side HTML5 Canvas with zero server uploads, zero watermarks, and zero monthly design subscr...

Turn customer reviews, tweets, and testimonials into high-converting social proof cards. Generates pure zero-dependency HTML & CSS code with zero third-party tracking scripts that hurt Google PageS...

Make a dense SQL query readable without sending it to a database. This formatter understands common SELECT, INSERT, UPDATE and DELETE clauses, preserves quoted strings/comments, and can output comp...

Model startup equity dilution across funding rounds. Calculates Y Combinator post-money SAFEs, valuation caps, employee option pool (ESOP) expansion, and founder equity value without paying thousan...

The question that ends startups: which month does the bank account hit zero? Enter your cash, your costs and your revenue growth, and it projects 36 months forward, finds your break-even month, cal...

Write a real set of terms for a small site, shop or SaaS product — the document Termly, iubenda and Shopify's policy apps charge a monthly subscription to generate and re-host. Answer a dozen quest...

Compare two versions of text and see additions, removals and unchanged passages in a clean unified diff. Choose line-by-line for documents and code, or word-by-word for short edits. Everything is c...

Run a stopwatch on real work, round it the way your contracts do, and turn the week into a CSV or a printable invoice-ready timesheet. Toggl, Harvest and Hubstaff charge per seat per month and hold...

Offline transcription workspace that replaces Otter.ai / Descript — upload audio/video, auto-transcribe with Web Speech API where available, hand-correct on a waveform, and export SRT / VTT / TXT. ...

Generate standardized Google Analytics 4 (GA4) tracking URLs across multiple marketing channels simultaneously. Enforces lowercase slugification, auto-encodes illegal spaces, and exports batch CSVs...