Upload a song or beat and find out what key it is in and how fast it goes. You get the key (like F# Minor), the Camelot key DJs use for harmonic mixing, the tempo in BPM and the time signature, all in one result. It runs online with nothing to install, and you do not need any music theory to read it.
You can try it free. New accounts get 6 free credits for 7 days, and checking a song costs 2 credits, so you can find the key and BPM of up to 3 songs before you pay anything. After that you buy credits as you need them, with no subscription required.
Upload the audio file (MP3, WAV, FLAC and other common formats, up to 80MB) and press Find Key & BPM. You get the key, the Camelot key, the BPM and the time signature together, and the result is saved to your History. It all runs online, so there is nothing to install.
The key and BPM come from Essentia, an open source audio analysis library that uses the same kind of signal processing found in DJ software. It compares the notes it hears against key profiles and follows the beat to measure the tempo, instead of asking an AI to guess. The time signature is the one part estimated by AI.
The Camelot Wheel is a system DJs use to find tracks that sound good together. Each key gets a number and a letter (for example 8A for A minor and 8B for C major). Staying on the same number, or moving one step around the wheel, gives you a smooth transition between tracks. To put a whole set in order, Plan DJ Setlist suggests a harmonic order for your tracks.
On some tracks the beat can be felt two ways, so a song you would tap at 140 BPM can read as 70, or the other way round. Every automatic tempo detector runs into this now and then. If the number looks off, double it or halve it to match how you count the beat.
You get one key for the whole track: the main key the analysis hears across the song. If your song modulates, for example up a step for the last chorus, upload just that section to check its key on its own.
Yes. Any audio file works, including beats, loops, samples, acapellas and stems. If a busy mix with heavy bass or sound design gives you a key that sounds wrong, try uploading a part with clear chords or melody, such as the instrumental from Vocal Remover.
Every result is saved to your History. You can download it as a PDF or email it to yourself for 1 credit each, and send the same file straight to AI MIDI Generation or Convert Audio to Sheet Music with one click.