C Ionian

The C Ionian mode — C D E F G A B — shown across the guitar neck.

Swipe the neck sideways to see the higher frets.

C Ionian is the major scale — same seven notes, same order. The mode name describes which chord you treat as home, not a different set of notes.

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