Free Guitar & Music Theory Tools

A growing collection of free tools for guitarists and musicians — no signup required.

Circle of Fifths

Explore keys, chords, and harmonic relationships interactively.

Paste in a chord sheet and instantly transpose it to any key.

Find all the diatonic chords for any major key — with Roman numerals and common progressions.

See chord equivalents for every capo position, with reverse lookup.

Detect musical notes in real time using your microphone.

Enter your chords and instantly find the key of any song.

Tap along to any song to instantly find its BPM.

Click any note to highlight all positions across the fretboard.

See major, minor, and pentatonic scale patterns across the full fretboard.

Convert chord progressions to Nashville numbers — and back.