SuperTuner

SuperTuner is not a toy tuner or a simple frequency counter. It implements professional stroboscopic tuning principles, five distinct meter display modes, 100+ instrument presets, and adaptive layouts for every iOS screen, built from the ground up with the same signal processing standards used in high-end hardware tuners.

Display

Five Meter Modes

Each meter is designed for a different use case, from the snap of an LED bar on a dark stage to the precision of a true stroboscopic display in a recording environment. All five modes work in full-screen landscape.

Features

Built for Real Use

• 100+ Instrument Presets 13 Groups

  Guitar in 22 tunings (standard through 8-string), bass, violin, viola, cello, mandolin, ukulele, banjo, pedal steel, Latin American strings (Charango, Venezuelan Cuatro, Jarana, Tiple Colombiano), world classical (Sitar, Tanpura, Veena, Erhu, Sarangi), woodwinds, reeds, and brass. Preset note lock constrains detection to the selected tuning, preventing snapping to adjacent chromatic notes.

• Reference Pitch Calibration

  Ten historical and modern reference standards, plus a free-form slider from 400–480 Hz at 0.1 Hz resolution. Calibration affects all pitch detection, note naming, cents calculation, and tone generation. Essential for period-instrument performers and orchestral players.

  • A = 415 Hz Baroque
  • A = 430.54 Hz Scientific C=256
  • A = 432 Hz Verdi
  • A = 440 Hz ISO Standard
  • A = 441 Hz Boston Symphony
  • A = 442 Hz New York Philharmonic
  • A = 443 Hz European Concert
  • A = 444 Hz European Bright
• Tone Generator

  Four waveforms: Sine, Triangle, Sawtooth, Square. A reference tone button for every note in the current tuning preset. Click-free start/stop via 25ms cross-fade state machine. Below 450 Hz, sine waves are enriched with subtle 2nd and 3rd harmonics to compensate for small phone speaker response. Speaker protection scaling prevents mechanical distortion on sub-bass. When a tone is playing, the tuner automatically recognizes its own harmonics and won't false-read them.

• Haptic Feedback

  Triple haptic pulse when pitch locks in tune for 0.5 seconds or more. Fires once per session, then resets when the note changes or pitch drifts. Toggle on or off in settings.

• Full-Screen Landscape Mode

  Any meter mode can expand to fill the full screen in landscape. Controls compact to a single-row tone bar at the bottom. Designed for live performance. Maximum visibility, minimum interface.

• Universal Layout

  Four distinct adaptive layouts for iPhone portrait, iPhone landscape, iPad portrait, and iPad landscape. All dimensions scale proportionally and clamp to prevent unusable extremes. Meters scale more aggressively, up to 1.8×, since they benefit most from additional screen real estate.

Under the Hood

Professional Signal Processing

SuperTuner's pitch detection uses autocorrelation with per-lag normalization, a time-domain algorithm that directly measures waveform periodicity. Unlike standard autocorrelation, per-lag normalization eliminates the systematic sharp bias that affects most tuners, producing accurate readings across the full dynamic range of an instrument.

Harmonic coherence scoring distinguishes real instrument notes from environmental noise (HVAC rumble, traffic, room resonance), even at low frequencies where noise contamination is most problematic. The algorithm adapts to the signal, not the other way around.

The stroboscopic meter uses the Goertzel algorithm to compute harmonic energy at specific frequencies in real time, the same physical principle as an analog strobe disc, not a visual approximation of one.

Platform

Specifications