Red–green 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.
Tap what you are playing and find out what it is called.
Tap a fret to add it, tap again to remove it. The lowest note you pick is treated as the bass.
No chord is made of exactly these notes.
Nothing in the library contains all of these notes.