Development Tools Progressive Web Apps

Offline API documentation browser with 100+ languages and frameworks. Combines MDN, React, Node.js, Python docs into one fast, searchable interface. Works completely offline.

The best regex debugger on the web. Real-time explanation, match highlighting, test strings, and a library of saved patterns. Supports PCRE2, JavaScript, Python, Golang regex.

Google's image compression tool — compare formats (WebP, AVIF, MozJPEG) side by side with live quality sliders. All processing is client-side. A must-have for web developers.

Drag-drop SVG optimizer with live preview. Uses SVGO under the hood — remove metadata, clean paths, reduce file size by 30-80%. Essential for frontend developers.

Check the bundle size of any npm package before installing it. Enter a package name, get instant size stats (minified + gzipped). A critical tool for keeping JS bundles lean.

Full browser-based IDE running Node.js via WebAssembly. Open GitHub repos instantly, run npm packages without installation, share working demos with a URL. No local setup needed.

Browser-based development environment for React, Vue, Angular, and more. Instant previews, collaborative editing, deploy with one click. Ideal for prototyping and sharing demos.

Generate color themes for your editor, terminal, wallpaper, and more from a single color palette. Supports VS Code, iTerm, Vim, Slack, and dozens of other apps.

Convert between web formats — JSON to TypeScript, HTML to JSX, CSS to Tailwind, SVG to React component, and 30+ other transformations. Indispensable for frontend developers.

Create beautiful screenshots of your code snippets. Customizable themes, backgrounds, and window decorations. Share code visually on social media — like Carbon.sh but installable.

Visualize JSON data as an interactive graph. Paste any JSON and instantly see the structure as nodes and edges. Essential for understanding complex nested API responses.

Search across half a million public GitHub repositories in real-time. Regex-powered code search with language filters. Find how real projects implement patterns.

Instantly get a unique URL to inspect and debug webhooks. See incoming HTTP requests in real-time — headers, body, params. Essential for building and testing webhook integrations.

Decode, verify, and generate JSON Web Tokens in the browser. Paste a JWT and instantly see the header, payload, and signature. The go-to debugging tool for auth developers.

The cron schedule expression editor. Type a cron expression and get a plain English explanation plus next execution times. Loved by every DevOps engineer and backend developer.

Community-maintained quick reference cheat sheets for 100+ tools — Linux, Git, Docker, Vim, Python, JavaScript, and more. Offline-capable, searchable, printable.

Paste any shell command and get a visual breakdown of every flag and argument. Each part links to the relevant man page section. Essential for learning and verifying complex commands.

Create beautiful images of your source code. Customizable syntax themes, fonts, window styles, and backgrounds. Share code snippets as stunning visuals — the original code screenshot tool.

Social development environment for front-end code. Build and share HTML/CSS/JS demos, explore thousands of community creations. The go-to for frontend prototyping and experimentation.

Open-source product analytics, session replay, feature flags, and A/B testing. Self-hostable alternative to Mixpanel/Amplitude — know how users really use your product.

Self-hosted WakaTime alternative — track your coding time by language, project, and editor. Open-source, GDPR-friendly, free for unlimited data. Know exactly where your dev time goes.

Collaborative browser IDE with AI assistance. Spin up a Python, Node, Java, or 50+ other language environment in seconds. The fastest way to start coding without local setup.

Drag a folder onto the page to deploy a website instantly. Get a live URL in seconds with a free SSL certificate. The fastest way to share a static site — no CLI, no git.