Everything in the catalog

Views STL and OBJ files in the browser, which the page says stay on your device.

Design game cards with HTML and Handlebars templates and export them for printing.

Chat, write, translate and transcribe with AI models downloaded to and run on your device.

Game that teaches CSS selectors by choosing the right items on a diner table.

Browser version of the Nand2Tetris tools for building chips and CPU from NAND gates.

Draws or searches molecules and shows them in 2D and 3D with data lookup.

Generates randomized non-player characters for Dungeons and Dragons with attributes, personality and description.

Minesweeper clone that its author describes as cruel but fair.

Progressive web app with a 64-step drum sequencer for building beats.

Calculates a CSS clamp formula to interpolate a value between two viewport widths.

Previews an icon inside maskable-icon safe zones and exports a PWA-ready version.

Evaluates SageMath code in a small web cell for symbolic math, plots and number theory.

Compare how different voting methods turn the same votes into different winners using interactive ballots.

Advanced cube timer with 1v1 matches, an algorithm trainer and leaderboards.

Frontend web app for exploring piano chords freely and interactively with sound.

Validates AsyncAPI documents, previews the docs and generates templates.

Electric guitar effects and cabinet emulator built with the Web Audio API.

Object detection app that runs YOLOv8 with ONNX Runtime Web on images or a webcam stream.

Author and test Vega and Vega-Lite chart specifications with live rendering and examples.

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

Toolbox for musicians that routes and transforms MIDI between devices directly in 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.

Searchable catalog of Dungeons and Dragons adventures filterable by level, setting and publisher.