How do I find the BPM of a song?

Upload your audio file to BeatKey and it will instantly detect the BPM (beats per minute) using Essentia.js audio analysis. Everything runs in your browser with no server uploads required.

How do I find the musical key of a song?

BeatKey analyzes your audio file and detects the musical key using KeyExtractor from Essentia.js. Results include the key name (e.g., A minor) and the Camelot code (e.g., 8A) for harmonic mixing.

What is a Camelot code?

Camelot codes are a numbering system used by DJs for harmonic mixing. Each key gets a number (1-12) and a letter (A for minor, B for major). Tracks with the same or adjacent Camelot codes mix harmonically without key clashes.

Is BeatKey free to use?

Yes, BeatKey is completely free with no account required, no subscription, and no usage limits. All audio analysis runs locally in your browser using WebAssembly, so your music files never leave your device.

Does BeatKey work on iPhone and mobile?

Yes, BeatKey works in Safari on iPhone and iPad, and Chrome on Android. Just open beatkey.app in your mobile browser and upload an audio file to detect BPM and key.