Tabworthy

40 websites every developer should know

The developer tools that get passed around team chats: docs, debuggers, converters and references you will wish you had found sooner.

Most are free or open source.

Updated · 40 sites · hand-checked

  1. 1. DevDocs

    Documentation for hundreds of APIs in one fast, searchable, offline-capable interface. Entirely keyboard driven.

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  2. 2. regex101

    Build, debug and explain regular expressions with a live match view and a step-by-step breakdown of every token.

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  3. 3. IT Tools

    A drawer of small developer utilities — hashes, JWT decoding, cron parsing, colour conversion, QR codes — in one tidy interface you can also self-host.

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  4. 4. CyberChef

    The cyber swiss army knife: encode, decode, compress, hash and parse anything by dragging operations into a recipe.

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  5. 5. Can I Use

    Browser support tables for every web platform feature, with usage share so you know what you can actually ship.

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  6. 6. MDN Web Docs

    The reference for HTML, CSS and JavaScript that actually gets updated. Documentation the whole web agrees on.

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  7. 7. crontab.guru

    A cron schedule expression editor that translates five cryptic fields into a plain English sentence.

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  8. 8. explainshell

    Paste a shell command and get every flag and argument annotated with the matching line from the man page.

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  9. 9. Transform

    Paste JSON and get TypeScript types, a Go struct or a Zod schema back. Dozens of one-way converters between the formats you keep retyping by hand.

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  10. 10. JSON Crack

    Paste JSON, YAML or CSV and watch it explode into an interactive node graph you can actually read.

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  11. 11. Hoppscotch

    Send REST, GraphQL and WebSocket requests straight from a browser tab. A fast, self-hostable alternative to Postman that opens instantly.

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  12. 12. Public APIs

    A gigantic curated list of free APIs, sorted by category, with auth and CORS support noted for each one.

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  13. 13. Free for Developers

    A long, maintained list of services with genuine free tiers for developers: hosting, databases, CI, email, monitoring and more.

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  14. 14. roadmap.sh

    Community-drawn learning roadmaps for frontend, backend, devops and more, with resources at every node.

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  15. 15. grep.app

    Search a million public GitHub repositories at once, with regex, in milliseconds. The quickest way to see how real code uses a function or config option.

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  16. 16. Compiler Explorer

    Type code on the left, watch the assembly appear on the right, colour-matched line by line, across dozens of compilers. The fastest way to see what yours actually does.

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  17. 17. Bundlephobia

    Type an npm package and see what it costs your users: minified and gzipped size, download time, and lighter alternatives, before you install it.

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  18. 18. Carbon

    Turn source code into a beautiful image for slides and posts, with real syntax themes and window chrome.

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  19. 19. Shields.io

    Concise, consistent and legible badges for your README, generated from live data about your project.

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  20. 20. readme.so

    Click together a README from ready-made sections like installation, usage and license, edit them side by side with a preview, and copy the Markdown.

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  21. 21. Learn Git Branching

    The best way to finally understand rebase: an animated, level-based sandbox for real git commands.

    • Developer
    • Open source
    • learngitbranching.js.org
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  22. 22. Web Check

    Web Check is the all-in-one OSINT and security tool, for revealing the inner workings of any website

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  23. 23. Cheatography

    Thousands of community-made cheat sheets for programming languages, tools and shortcuts, all printable.

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  24. 24. Cursify

    A library of animated cursor effects for React and Next.js, from trails to spotlights, each with copy-paste code.

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  25. 25. Originkit

    A library of animated website components, from text effects to scroll reveals, to copy into code or Framer.

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  26. 26. Staying

    Paste code and watch it run step by step, with variables, arrays and the call stack drawn as it goes.

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  27. 27. UI Ball

    Small, lightweight loading spinners and other UI bits for the web, ready to copy as CSS, React or SVG.

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  28. 28. Anime.js

    A small JavaScript animation library with a homepage that shows off what it can do. Timelines, staggering and SVG morphing with a pleasant API.

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  29. 29. Can I email

    Like Can I use, but for email clients. Look up any HTML or CSS feature and see whether Gmail, Outlook and Apple Mail will actually render it.

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  30. 30. dbdiagram.io

    Type tables and relations in a tiny markup language and watch the entity-relationship diagram draw itself next to your code.

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  31. 31. Decker

    A HyperCard-style multimedia sketchbook with 1-bit graphics. Draw cards, add buttons and a little scripting, and you have a zine, a game or a tool.

    • Developer
    • Open source
    • internet-janitor.itch.io
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  32. 32. Devhints

    Hundreds of one-page cheatsheets for languages, frameworks and CLI tools, written to answer the question you have right now and nothing more.

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  33. 33. HTTP Cats

    A cat photo for every HTTP status code, served at http.cat/404 and friends. Half joke, half the reference you end up linking in API docs.

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  34. 34. JWT.IO

    Paste a JSON Web Token to decode its header and payload and check the signature. The first tab everyone opens when auth goes wrong.

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  35. 35. Mockaroo

    Describe the fields you need and get a thousand rows of believable fake data as CSV, JSON or SQL, from names and addresses to IBANs and car models.

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  36. 36. React Bits

    Over a hundred animated React components, from text effects to WebGL backgrounds, each with a live preview and props to play with before you copy it.

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  37. 37. Shadertoy

    Thousands of GPU shaders running live in the browser, from fractal landscapes to whole demoscene worlds in a few hundred lines. Fork any of them and tweak.

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  38. 38. Uiverse

    A community gallery of buttons, loaders, toggles and cards made in plain CSS or Tailwind. Copy the code of any one you like, no attribution needed.

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  39. 39. Wokwi

    Wire an Arduino, ESP32 or Pico on a virtual breadboard, flash real firmware and watch LEDs blink and displays light up, with no hardware on your desk.

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  40. 40. web.dev

    Guidance on performance, accessibility and modern browser capabilities, straight from the Chrome team.

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Questions

What websites do programmers use every day?

MDN and DevDocs for documentation, regex101 for regular expressions, Can I Use for browser support, and crontab.guru and explainshell for the command line.

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