Applies wherever a note is simply named. Where the spelling is fixed by the music — the chords of a key, the notes of a triad — it stays as written.
The default already covers deuteranopia and protanopia; blue–yellow covers tritanopia, and high contrast drops colour altogether. Every dot is labelled and roots are filled, so the board never relies on colour alone.
Fret number, 1 to 24. Leave it empty for no capo. Notes behind the capo are hidden, since you can’t play them.
Tap any note on a fretboard to hear it.