Everything in the catalog

Transpile or minify JavaScript and TypeScript with the SWC compiler and adjustable options.

Visual, interactive tutorial and sandbox for learning git commands and branching.

Packs a local or remote repository into a single AI-friendly file in XML, Markdown, JSON or plain text.

Live Swagger UI demo that lets you load a spec URL and try its endpoints.

Demo of the open-source FingerprintJS library that computes a visitor ID from browser attributes.

Compares image codecs side by side and recompresses photos to smaller JPEG, WebP, AVIF or PNG files.

Builds an nginx server configuration from form options for performance and security.

Upscales and denoises anime-style art, and photos, with convolutional neural networks.

Creates README-ready status badges for repositories, builds and downloads.

Interactive demo showing how ReDoc renders an OpenAPI spec as a three-panel API reference.

x86 PC emulator in WebAssembly that boots Linux, KolibriOS and older Windows.

Try the D2 diagram scripting language and get rendered diagrams from short text declarations.

Combines typing practice with English vocabulary using word lists and pronunciation.

To-do list, time tracker and day planner that works offline and integrates with issue trackers.

In-browser Markdown editor with live preview and publishing to blogs and cloud drives.

Visualize a database schema as a diagram from query output and edit or export it.

Live demo of the markdown-it parser, showing rendered output, HTML source and the token tree.

Customizable typing speed test with many modes, word lists and stats; an account is optional.

Local file sharing in the browser that discovers nearby devices and sends files directly.

Shows the assembly a chosen compiler produces for C++, Rust, Go and many other languages.

Open-source grammar checker that runs on your own device, so text is not sent to a server.

Interactive chess lessons teaching piece movement, captures, and checkmate by playing mini games.

Shared analysis boards where you annotate games with comments and variations, alone or with others.

Flash Player emulator demo that plays SWF files you load, preserving old browser games and animations.