Bounce Orchestra
A spinning shape where every wall is a note and every bouncing ball is a musician. Music plays itself.
Screenshots
Screenshots supplied by the seller.
Description
Bounce Orchestra turns physics into music. Balls bounce around inside a slowly spinning shape, and each time one strikes a wall, that wall plays its note. Because the walls follow a musical scale, whatever happens sounds good, and because the shape never stops turning, the tune never quite repeats.
Click inside the shape to add a ball, and choose whether it plays a bell, a pluck or a buzz. Change the shape from a triangle to an octagon, spin it faster or backwards, and add gravity to make the rhythm tumble. Swap between five scales and seven keys while it plays.
Four ready-made arrangements get you started, from the calm Rain on glass to the chaos of Triangle riot. Walls flash and balls leave ripples as they strike, so it's as good to watch as it is to hear.
All sound is synthesised live in the browser with no audio files, in a bold Bauhaus poster design. Plain HTML, CSS and JavaScript with no server or running costs. It works as a relaxing toy, a teaching aid for scales, or a generative background for streams.
Condition
Development stage: Working prototype (seller-declared)
Seller-declared: provided by the seller, not independently verified by SellMyVibe.
- Solo creator
- Mainly AI-generated
- Under one month in development
- Mobile-friendly
- Tests included
- Setup guide included
- Demo available
What works
- Spinning shapes with 3 to 8 walls
- Physics with spin, gravity and speed limits so the music never stalls
- Add balls by clicking or tapping, up to 24
- Bell, pluck and buzz voices synthesised live, with echo
- Five scales and seven keys, changeable while playing
- Note names shown on every wall
- Four ready-made arrangements
- Pause, remove a ball and clear the stage
- Settings remembered between visits
- 9 tests covering notes, physics, presets and that balls can't escape
What’s unfinished
- No recording or audio export
- Your own arrangements can't be saved or shared
- Sound quality has only been checked by automated tests, so tune the voices and levels by ear
Included assets
Full source code
Test suite
Documentation
Technologies
HTML, CSS, JavaScript (ES modules), Canvas, Web Audio API, localStorage, Node test runner
Setup requirements
Upload the files to any static web host. To try it locally, run python3 -m http.server and open http://localhost:8000. Run the tests with npm test (Node 20 or newer).
Dependencies and ongoing costs
None. It's a static site that runs free on any web host, uses system fonts and needs no audio files.
Known limitations
Browsers only allow sound after a click or tap, so it stays silent until you press Turn sound on or click the stage. Only settings are remembered, not the balls.
Listings are reviewed for completeness and clarity before publication. Approval is not a guarantee of quality, ownership, security or commercial success. Read the details and ask questions before buying.