Tools
Small tools, no signup, no app.
Everything here runs in the browser. The chord finder and trainer store nothing on a server; the capo chart and circle of fifths are pure reference.
Reference
Chord finder
Pick any root and quality. Two movable shapes, notes, and audio.
OpenPractice
Chord change trainer
60 seconds, two chords, count only the clean changes.
OpenTranspose
Capo chart
Shape → sound, or target key → capo position. Two-way lookup.
OpenTheory
Circle of fifths
Click a key to see its six chords, signature and common progressions.
Open