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perihelion

A free generative music toy — play it in your browser, no install. Draw a solar system. Hear it become a loop. A zero-dependency orbital sequencer built with Canvas and Web Audio.

by @gjjkbssg · gjjkbssg/perihelion on GitHubLANG JavaScriptHOSTED ON GJJKBSSG.GITHUB.IOUPDATED 31 Aug 2026

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Controls: Space · Mouse

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From the README

Draw a solar system. Hear it become a loop.

A zero-dependency orbital sequencer built with Canvas and Web Audio.

Place satellites around the sun. Every time a satellite crosses the top meridian, it plays a note. Inner orbits are brighter and faster; outer orbits are deeper and slower. The picture you draw is the loop you hear.

Perihelion includes three composed systems, three harmonic fields, live tempo control, local persistence, and shareable universes encoded entirely in the URL.

Keyboard shortcuts: Space plays or pauses, R remixes, C clears, S toggles audio, and ? opens the guide.

Read the full README on GitHub →

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