Key finder: find the key of any song
Free, no signup. We analyse the whole track, not a clip, and show the BPM as well.
Find key & BPM
Check one song's key and tempo, free.
How accurate is it?
When it answers, it's right about 80% of the time. It answers on about 44% of songs. Below its confidence threshold it tells you so rather than guessing. How we measured it.
Tempo and key detection: Beat This! (Foscarin, Schlüter & Widmer, CPJKU); S-KEY (Kong et al., Deezer)
Need the vocals or the instrumental on their own? Try the vocal remover.
Frequently asked questions
How do I find the key of a song?
Upload the song above. StemX listens to the whole track and shows its musical key, usually within a few seconds.
Why does it sometimes say it isn't confident?
It only names a key when the model's confidence is high. That is how it keeps its precision at about 80%; below that threshold it tells you so rather than guessing.
How accurate is it?
When it answers, it's right about 80% of the time. It answers on about 44% of songs.
Is it free?
Yes. You can check up to 20 songs a day without an account. Files can be up to 10 minutes and 120 MB.
Does it also find the BPM?
Yes. Results usually show the tempo too, in beats per minute, with half and double time alongside.