Spirograph — Curves to Play With

An interactive spirograph that runs in your browser: explore hypotrochoids and epitrochoids in 2D and 3D, tune the gears, and watch the curve draw itself. Install it as a web app and it keeps working offline. No account, no tracking, nothing collected.

Shared as is: an experiment, finished, with no updates promised. Free and open source under the MIT license. The code is on GitHub at github.com/hazanaya/spirograph.