Everything in the catalog

Compiles Sass or SCSS to CSS in the browser.

Browser terminal that installs and runs WASI WebAssembly packages.

Compiles C and C++ to WebAssembly and shows the text format and assembly side by side.

Parses binary files using a .ksy format description and shows the decoded object tree beside a hex view.

Talks to serial devices such as Arduinos from the browser using the Web Serial API.

Run and share Swift snippets in the browser.

Validates AsyncAPI documents, previews the docs and generates templates.

Sample apps and an expression playground for the WebNN API, which runs neural networks on device hardware from the browser.

Interactive IEEE 754 float editor where you flip sign, exponent and mantissa bits and see the value.

Generates Swagger schema models in YAML or JSON from a sample of JSON data.

Runs OCaml in a browser toplevel with no installation.

Converts a docker-compose file back into docker run commands.

Installs Tasmota firmware on ESP devices from the browser.

Generates FIRST, FOLLOW and PREDICT sets for a grammar, to help when designing a programming language.

Keyboard-driven JSON formatter and editor that works privately in the browser and can be installed as a web app.

Browse the files inside any npm package in the browser, built on unpkg.

Opens and analyzes very large log files, over 10 GB, directly in the browser without uploading them.

Helps you build an Agent Skill (SKILL.md) by choosing a job, rules and a personality.

Free fake REST API with posts, comments, todos and users supporting all HTTP methods.

A web app with 12 open-source tools for frontend work, such as SVG and CSS utilities.

Generates code and small apps from a prompt with a choice of models; sign in with Hugging Face.

Generates a web application from a text prompt through vibe coding.

Converts a Hugging Face model to a quantized GGUF file and uploads it to your account; needs login.

Generates a small web app from a prompt and shows the result immediately.