Welcome to CircleofThirds.com
Explore chords, scales, and intervals
This site is still under development. Reach out to me at r/CircleOfThirds if you have any feedback, bug reports, or feature requests.
Click to select. Step:
Add new button to selected note i
NEW: Base octave is saved in the button
i
Triad inversions and voicings
Optimized for desktop
Click or tap anywhere to activate audio
Hover a note to play
Chord detection is approximate. i
Playing notes:
Current Key: C Major
MIDI: No MIDI keyboard detected
Some key combinations may not work together.
Keyboard layout may differ from the one above.
Optimized for Desktop, will not work well on mobile.
Version 1.0.12, built on October 1, 2025