A little theory helper

What key am I in?

Tap the chords you're playing — or the notes you hear. Every answer is weighed against all 24 keys, and the best fit rises to the top of the circle.

Step 01 · in use Tap to toggle, or type any chord

What are the chords?

Or type anything:

Step 02 · in use One octave, C to B · tap to mark

Step 03 — The verdict Your key sits at the top of the circle