tunertuner: Guitar Bass Tuner

Pluck a string and see which one it is and how far off. Guitar, bass to low B, ukulele, violin, viola, cello. No ads, no subscription: 7-day trial, then pay once.

tunertuner is a guitar tuner, bass tuner, ukulele tuner and violin tuner for iPhone. Open the app, pluck a string, and it shows which string you played and how many cents sharp or flat it is. It covers 6- and 7-string guitar (acoustic or electric), 4-, 5- and 6-string bass, four ukulele tunings, violin, viola and cello, works offline, and lets you set A4 from 430 to 450 Hz (for example 440 or 442 Hz). There is no home screen, no sign-in, and nothing to set up.

• Instant tuning: pluck a string and the needle appears, green when you are within ±3 cents, red when you are not. • Built for low strings: detects down to a low B0 (30.87 Hz), so 5- and 6-string basses are covered, and up to E5 for violin. • Guitar 6, Bass 4, Ukulele GCEA and Violin 4 are ready by default. With the gear button in the bottom bar you can choose instruments (one switch per instrument turns all of its tunings on or off), including Bass 5, Bass 6, Guitar 7, three more ukulele tunings, Violin 5, Viola and Cello. • Big, clear string cards show the note, octave and string number, with a single needle so you always know which string you are tuning. • Adjustable reference pitch (A4 = 430–450 Hz, e.g. 442 Hz for orchestras) and a haptic tick the moment a string is in tune, so you can tune by feel. • Single-string mode: tap a card to lock onto that string — handy for a string that is far off or for a noisy room. Tap it again to go back to automatic. • Designed to be readable: dark full-screen layout, Dynamic Type, VoiceOver, Reduce Motion, Increase Contrast, and non-color cues (check mark and left/right arrows). • Private by design: audio is analyzed live on your iPhone and is never recorded, stored or uploaded. No analytics, no accounts.

Standard tunings only: Guitar 6: E2 A2 D3 G3 B3 E4 · Guitar 7: B1 E2 A2 D3 G3 B3 E4 Ukulele: GCEA (G4 C4 E4 A4) · ADF#B (A4 D4 F#4 B4) · DGBE (D3 G3 B3 E4) · FA#DG (F2 A#2 D3 G3) Bass 4: E1 A1 D2 G2 · Bass 5: B0 E1 A1 D2 G2 · Bass 6: B0 E1 A1 D2 G2 C3 Violin (Vn) 4: G3 D4 A4 E5 · Vn 5: C3 G3 D4 A4 E5 · Viola (Va) 4: C3 G3 D4 A4 · Cello (Ca) 4: C2 G2 D3 A3 · Ca 5: C2 G2 D3 A3 E4

Start the 7-day free trial to use every feature; after that, a single one-time purchase unlocks the tuner for good.