Everything in the catalog

Visualize the harmonic overtones of a note and hear how they add up to a timbre.

Click a grid to make short melodies and loops with simple instruments in the browser.

Sketch melodies on a piano roll by painting notes on a grid and play them back.

See how sound waves move and change with pitch, and play a keyboard to hear and view the result.

Pluck virtual strings of different lengths to learn how length changes pitch and harmonics.

Record your voice and spin it on a record to change its speed, pitch and direction.

Free open-source digital audio workstation in the browser for music education and production.

Piano-roll MIDI editor in the browser.

DuckDB SQL shell that runs entirely in the browser via WebAssembly, reading local and remote files.

Makes code snippet images with gradient backgrounds and window chrome.

Generates and interpolates between short melodies and drum patterns using a variational autoencoder in the browser.

Play a few buttons and a neural net turns them into a full piano performance in your browser.

Transcribes piano audio into MIDI notes in the browser using the Onsets and Frames model.

Configurable random test data generator exporting to SQL, CSV, JSON, XML and more.

Draw points, lines and polygons on a map and edit the resulting GeoJSON side by side.

Opens and edits Word, Excel and PowerPoint files and annotates PDFs in the browser, with processing done locally.

MIDI utility for learning piano scales, chords and more using a connected MIDI keyboard.

Generates color scales whose steps meet target contrast ratios for design systems.

Shows contrast scores for every combination in a set of colors.

No-code chart builder that also produces a Chart.js image URL, no login needed.

Puzzle game that teaches functional programming ideas by composing functions to transform cubes.

Add images, signatures and text to a PDF with everything done inside the browser.

Picks and converts colors in OKLCH and warns when they fall outside a display gamut.

Simple visual editor for building tikz-cd commutative diagrams and copying the LaTeX.