Key Detector
Play something. It names the chords as they go by, works out what key they add up to, and has a guess at what is coming next.
listening…
start the microphone to begin
Alternatives
Chord history
chords appear here as you play
input — tempo — tonal — 0.0s idle
It is always listening and always keeping the last three minutes. If it reads the wrong key, type what the key should be and save — the take is already in memory, so you never have to reproduce the mistake on purpose. Nothing leaves your machine; the audio is analysed in the browser and the file saves to your downloads.