C Locrian

The C Locrian mode — C Db Eb F Gb Ab Bb — shown across the guitar neck.

Swipe the neck sideways to see the higher frets.

C Locrian is the natural minor with the b2 and b5 — Db and Gb. Those are the notes that give it its character.

The tool shows this from its parent key, Db major, with C marked as where Locrian begins, the same seven notes centered on Db.