Welcome to BeatCombo — Auto-Generated Rhythm Game from Any Song

BeatCombo is a free, browser-based rhythm game where the charts come from you. Drop any audio file — a pop song you love, a public-domain classical piece, your own production — and the editor auto-detects the BPM and onset map, then generates three difficulties you can publish to a public library.

How it works

The editor runs entirely in your browser. Audio decoding, BPM tracking, onset detection, and chart generation all happen client-side via the Web Audio API and a bundle of analysis code. When you publish, the audio file uploads directly to Cloudflare R2 via a presigned URL — never through our servers — so even long classical tracks land in seconds without timeouts.

What you can do today

• Browse the community library — 220+ classical and creative-commons tracks already uploaded.
• Open the editor and drop a song to see it auto-charted.
• Compete on global leaderboards.

What is coming next

• Touch-screen play for tablets and phones
• Replay sharing — record + watch friends' runs
• Custom skins and visual effects
• More languages — we already support English, Simplified/Traditional Chinese, Japanese, and Korean

Got a track in mind? Drop it into the editor and tell us how the auto-chart went — feedback shapes everything we build next.