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Developer
43 sites
Web Check
Web Check is the all-in-one OSINT and security tool, for revealing the inner workings of any website
web-check.xyz
Cheatography
Thousands of community-made cheat sheets for programming languages, tools and shortcuts, all printable.
cheatography.com
Cursify
A library of animated cursor effects for React and Next.js, from trails to spotlights, each with copy-paste co
cursify.ui-layouts.com
Originkit
A library of animated website components, from text effects to scroll reveals, to copy into code or Framer.
originkit.dev
Staying
Paste code and watch it run step by step, with variables, arrays and the call stack drawn as it goes.
staying.fun
UI Ball
Small, lightweight loading spinners and other UI bits for the web, ready to copy as CSS, React or SVG.
uiball.com
Free for Developers
A long, maintained list of services with genuine free tiers for developers: hosting, databases, CI, email, mon
free-for.dev
Anime.js
A small JavaScript animation library with a homepage that shows off what it can do. Timelines, staggering and
animejs.com
Bundlephobia
Type an npm package and see what it costs your users: minified and gzipped size, download time, and lighter al
bundlephobia.com
Can I email
Like Can I use, but for email clients. Look up any HTML or CSS feature and see whether Gmail, Outlook and Appl
caniemail.com
dbdiagram.io
Type tables and relations in a tiny markup language and watch the entity-relationship diagram draw itself next
dbdiagram.io
Decker
A HyperCard-style multimedia sketchbook with 1-bit graphics. Draw cards, add buttons and a little scripting, a
internet-janitor.itch.io
Devhints
Hundreds of one-page cheatsheets for languages, frameworks and CLI tools, written to answer the question you h
devhints.io
grep.app
Search a million public GitHub repositories at once, with regex, in milliseconds. The quickest way to see how
grep.app
Hoppscotch
Send REST, GraphQL and WebSocket requests straight from a browser tab. A fast, self-hostable alternative to Po
hoppscotch.io
HTTP Cats
A cat photo for every HTTP status code, served at http.cat/404 and friends. Half joke, half the reference you
http.cat
JWT.IO
Paste a JSON Web Token to decode its header and payload and check the signature. The first tab everyone opens
jwt.io
Mockaroo
Describe the fields you need and get a thousand rows of believable fake data as CSV, JSON or SQL, from names a
mockaroo.com
React Bits
Over a hundred animated React components, from text effects to WebGL backgrounds, each with a live preview and
reactbits.dev
readme.so
Click together a README from ready-made sections like installation, usage and license, edit them side by side
readme.so
Shadertoy
Thousands of GPU shaders running live in the browser, from fractal landscapes to whole demoscene worlds in a f
shadertoy.com
Transform
Paste JSON and get TypeScript types, a Go struct or a Zod schema back. Dozens of one-way converters between th
transform.tools
Uiverse
A community gallery of buttons, loaders, toggles and cards made in plain CSS or Tailwind. Copy the code of any
uiverse.io
Wokwi
Wire an Arduino, ESP32 or Pico on a virtual breadboard, flash real firmware and watch LEDs blink and displays
wokwi.com
Compiler Explorer
Type code on the left, watch the assembly appear on the right, colour-matched line by line, across dozens of c
godbolt.org
IT Tools
A drawer of small developer utilities — hashes, JWT decoding, cron parsing, colour conversion, QR codes — in o
it-tools.tech
Public APIs
A gigantic curated list of free APIs, sorted by category, with auth and CORS support noted for each one.
github.com
DevDocs
Documentation for hundreds of APIs in one fast, searchable, offline-capable interface. Entirely keyboard drive
devdocs.io
web.dev
Guidance on performance, accessibility and modern browser capabilities, straight from the Chrome team.
web.dev
Shields.io
Concise, consistent and legible badges for your README, generated from live data about your project.
shields.io
crontab.guru
A cron schedule expression editor that translates five cryptic fields into a plain English sentence.
crontab.guru
patterns.dev
A free book on design patterns and component patterns for modern web apps, with runnable examples.
patterns.dev
Carbon
Turn source code into a beautiful image for slides and posts, with real syntax themes and window chrome.
carbon.now.sh
explainshell
Paste a shell command and get every flag and argument annotated with the matching line from the man page.
explainshell.com
Refactoring Guru
Design patterns and refactorings explained with clear diagrams and code in a dozen languages.
refactoring.guru
QuickRef.ME
Dense, well-organised cheat sheets for languages, tools and commands. The one you keep in a pinned tab.
quickref.me
regex101
Build, debug and explain regular expressions with a live match view and a step-by-step breakdown of every toke
regex101.com
roadmap.sh
Community-drawn learning roadmaps for frontend, backend, devops and more, with resources at every node.
roadmap.sh
JSON Crack
Paste JSON, YAML or CSV and watch it explode into an interactive node graph you can actually read.
jsoncrack.com
Can I Use
Browser support tables for every web platform feature, with usage share so you know what you can actually ship
caniuse.com
Learn Git Branching
The best way to finally understand rebase: an animated, level-based sandbox for real git commands.
learngitbranching.js.org
CyberChef
The cyber swiss army knife: encode, decode, compress, hash and parse anything by dragging operations into a re
gchq.github.io
MDN Web Docs
The reference for HTML, CSS and JavaScript that actually gets updated. Documentation the whole web agrees on.
developer.mozilla.org