BPM & Key Finder

Drop in a track and get its tempo, key, and Camelot code in seconds — your audio never leaves your browser. Runs locally, any format, unlimited use, no signup required.

Questions producers ask

Why does it say 70 or 280 when my track is 140?

Tempo detection can lock onto a half-time or double-time reading of the real beat — 70 and 280 are both mathematically valid readings of a 140 BPM track, just counted differently. That's why we show half and double chips next to the main number.

What is a Camelot code?

The Camelot wheel is a DJ-friendly way to label musical keys (like 8B or 4A) so you can spot compatible keys for harmonic mixing at a glance. Keys with the same number but a different letter are relative major/minor pairs; keys one number away on the same letter are also safe to mix.

Is my audio uploaded anywhere?

No. The file is decoded and analyzed entirely in your browser using the Web Audio API — it never touches our servers. Close the tab and it's gone.

How accurate is key detection?

Key detection is reliable on tonal music with a clear harmonic center — most pop, hip-hop, house, and rock tracks. Heavily distorted, atonal, or key-changing tracks can fool any key detector, including this one.