HarmonicTune: Instrument Tuner

Stop fighting with cheap clip-on tuners.

HarmonicTune is a professional instrument tuner built for musicians who need reliable, accurate pitch detection — on stage, in rehearsal, or at home. Instead of listening for a single frequency, it analyzes your instrument's harmonic spectrum with detection algorithms matched to each instrument family, giving you stable, confident readings even in noisy rooms.

WHY HARMONIC ANALYSIS?

Standard tuners track one frequency and get confused by background noise or octave ambiguity. HarmonicTune combines three pitch-detection methods — harmonic spectrum analysis, cepstral analysis, and autocorrelation — and weighs the energy of up to 8 harmonics to score every reading. A built-in confidence meter shows instantly whether a reading is trustworthy, and an adaptive noise gate calibrates to your room automatically.

HIGHLIGHTS:

• Precision Needle Gauge — Smooth analog needle with real-time frequency (Hz) and cents deviation. Color-coded status at a glance: green when in tune, rose when sharp, sky blue when flat.

• 30+ Instrument Profiles — Guitar, Bass (4/5/6-string), Ukulele, Violin, Cello, Trumpet, Flute, Saxophone, Snare Drum, Piano, and more. Each profile uses a detection algorithm matched to that instrument's pitch range and overtone character.

• Alternate Guitar Tunings — Standard, Drop D, Drop C, Open G, DADGAD, and New Standard Tuning built in.

• String-by-String Mode — Step through each string with a target-note display; when a string locks in tune, the tuner automatically advances to the next one. Auto mode detects any note freely.

• 14 Temperament Systems — Equal, Pythagorean, Just Intonation (C/G/D/A), Meantone (1/4, 1/5, 1/6 comma), Werckmeister III & IV, Kirnberger III, Vallotti, and Young. Adjustable A4 reference from 400–480 Hz for historical and period tunings.

• Adjustable Precision — Set your in-tune tolerance anywhere from ±1 to ±15 cents, from strict studio accuracy to quick stage touch-ups.

• Confidence Meter — A live indicator shows how reliable the current reading is, so you never chase a noisy signal.

• Pitch History Graph — Visualize pitch stability over time to confirm strings are holding tune.

• Stage-Ready Dark Theme — Near-black interface with dimmed indicators protects your night vision during live performances. Light and system themes included.

• Haptic Feedback — Distinct vibration patterns for flat, sharp, and in-tune status. No need to watch the screen on stage.

• Smart Interruption Handling — Pauses gracefully for incoming calls and resumes afterward; protects your device by pausing when it overheats or the battery runs critically low.

• 100% Offline — All audio processing happens on-device. No audio is recorded, stored, or transmitted. No network required, no accounts, no subscriptions, no ads.

SUPPORTED INSTRUMENTS:

Strings: Guitar (6 tunings), Bass (4/5/6-string), Ukulele, Violin, Viola, Cello, Double Bass, Banjo (4/5-string), Mandolin Brass: Trumpet, Trombone, French Horn, Tuba, Cornet Woodwind: Flute, Clarinet, Saxophone (Alto/Tenor/Soprano), Oboe, Bassoon Percussion: Snare Drum, Bass Drum Keyboard: Piano Plus a fully custom profile — 30+ profiles in total.

HarmonicTune is a one-time purchase. No subscriptions, no ads, no in-app purchases. Buy once, tune forever.