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.
By ear, or by microphone.
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Listening is off
Damp the other strings as you tune: two strings ringing at a similar volume can only be told apart by which one you meant. The microphone is used solely in your browser to work out the pitch — nothing is recorded or sent anywhere.