Overtone is a guitar tuner that gets out of your way. Open it and it's already listening — no buttons, no setup. Pluck a string and the big, easy-to-read display tells you exactly where you are and which way to turn. PRECISE, RESPONSIVE TUNING • Real-time pitch detection that locks on fast and reads steady • Auto string detection — it knows whether you're on the low E or the high one, so you can just play • Clear cents readout with flat / in-tune / sharp guidance and a satisfying nudge when you land it • Standard tuning (E A D G B E), A4 = 440 Hz • Lock to a single string when you want to stay put SCALES & FRETBOARD MAPS More than a tuner — a pocket reference for finding your sound: • Scales grouped by feel across blues, folk, soul, and reggae • Tap any scale to see it laid out on the fretboard • Transpose to any root to match the song you're playing • Save the scales you reach for most to your favorites PLAY ALONG IN REAL TIME Turn practice into a game your ears can see: • Pick a scale and start playing — the board lights up the exact note you're hitting, live • Watch your runs come alive on the fretboard as you move • A new way to learn a scale, find the next note, and stay in key BUILT TO LOOK AT A vintage, hand-tuned aesthetic — warm amber on deep black, serif numerals, and a subtle film grain — that feels like a piece of studio gear, not a utility app. The screen stays awake while you tune so you're never reaching for your phone mid-string. No accounts. No clutter. Just pick it up and play in tune.