Drop in a track and get its musical key, tempo and energy. Everything runs inside your browser, so your audio never leaves your computer.
Detected from a 40-second slice in the middle of the track, where the beat and key are clearest.
Find the key and BPM of any song online, free. Drop in an MP3 or WAV and get key, scale, tempo and danceability in seconds. Runs in your browser — no upload, no sign-up. Everything happens locally in your browser: your file is never uploaded to a server, so it works offline once the page has loaded and nothing is stored anywhere.
Over a thousand royalty-free vocals from real singers, with the key and BPM already listed.
Browse vocals