Know every note on the fretboard - the skill that unlocks scales, chords, and improvisation. Fretboard King drills you in fast 10-note sessions. You get a note and a string; tap the fret where it lives. One tap, instant feedback, next note. At the end of each session: your score, your best run, and one insight that tells you exactly what to drill next. - 10-note sessions: a complete rep in under a minute - One-tap answering with instant right/wrong feedback and haptics - Misses teach: the correct position lights up before the next note - Timed mode with adjustable speed, or untimed while you learn - Drill specific strings (just the B string, if that's your weak spot) - Octave challenge: hunt one note across every string, in random order - Portrait and landscape, 12 or 24 frets, notes shown in sharps - No account, no ads, no tracking. Works fully offline. Advanced players score 100%. Keep drilling until you do.