All major & minor keys — pick a key to see its sharps/flats, or pick sharps/flats to find the key.
Major keys (15)
Minor keys (15)
Treble (G) clef — key signature as written on the staff
How many sharps? (tap in order)
Signatures always use a fixed order — sharps: F♯ C♯ G♯ D♯ A♯ E♯ B♯ • flats: B♭ E♭ A♭ D♭ G♭ C♭ F♭. Tapping one selects all up to it; tap it again to clear.