Free tool

Tempo and key

We detect your song's tempo (BPM) and key, with its Camelot code and the keys that mix well with it.

In your browser · nothing is uploaded

Drop your songs here or choose the files

Your files never leave your computer: they're processed in this browser.

Free with your account: when you pick the song we'll ask you to create one (or sign in) and you'll come back here with it already loaded.

Prepare your set

Add one song or your whole list: we tell you each one's tempo and key, and which ones mix well together.

Your songs are analysed in this browser, in the background: they aren't uploaded anywhere.
The tempo comes from the song's hits (kick, snare and other attacks), with the same detection as our video studio. If it says 87 and you hear 174, pick «Double».
The key comes from which notes sound the most across the whole song (a chromagram), compared with the Krumhansl–Kessler profiles of the 24 keys. The second choice is usually its relative key: if in doubt, listen for it.
Camelot and Open Key number the keys on a wheel: moving to the same slot, the one next to it or the one on the other ring sounds natural.