BPM & Key Finder
Drop a track in. You get its tempo, its musical key and its Camelot code — in about five seconds, free, with no account.
Analysing…
Made with a tempo you liked?
MIBL gives you a free 24/7 radio station of your own, mastering, and a place to publish. No card, no server to run.
Start freeHow it works
Tempo comes from onset detection — the analyser finds where the beats land and measures the spacing. The key comes from a pitch histogram matched against the Krumhansl-Schmuckler profiles, the standard method for estimating key from audio. Both are estimates, not verdicts: a track with a sparse or heavily processed melody is genuinely hard to key, and the confidence figure tells you when to trust it.
Your file is deleted the moment the analysis finishes. It is never stored, never shared, and never sent anywhere else — everything runs on our own server.