Centronome: Tuner & Metronome

piano mode now shows string inharmonicity (B coefficient). Strobe display and a ±1-cent precision mode for setup work and daily practice alike.

Centronome puts a high-precision tuner and a rock-solid metronome on one screen. Tune while you keep time — no tab switching.

TUNER, BUILT LIKE AN INSTRUMENT

YIN pitch detection with FFT harmonic verification, based on current pitch-tracking research, for stable readings without octave errors Resolution well below one cent on steady tones; Precision mode reads to two decimal places Strobe display: the slightest drift shows as rotation — when the wheel stops, you're in tune Four accuracy modes: Easy (±5 c), Normal (±3 c), Precision (±1 c), and Strobe 9 instrument presets: Chromatic, Guitar Standard, Drop D, Guitar High-Precision, Bass, Ukulele, Violin, Voice, and Piano single-note Per-string targets: see which string you're closest to and how many cents remain Piano mode estimates string inharmonicity (B coefficient) and the deviation of the second partial A4 reference adjustable from 410 to 480 Hz in 0.1 Hz steps, sharp/flat notation, and a calibration offset for known hardware bias Microphone input uses iOS measurement mode — no AGC or noise suppression coloring your signal A METRONOME THAT DOESN'T DRIFT

Click timing is decided on the audio clock, immune to dropped frames and notifications — measured jitter is on the order of microseconds 20–300 BPM with tap tempo Time signatures: 1/4–5/4, 6/8, 7/8, 9/8, 12/8 Subdivisions: quarters, eighths, triplets, sixteenths — with swing (50–75%) on even subdivisions Fully editable accent pattern per beat; accents differ in timbre, not just volume Four click sounds (Classic, Woodblock, Digital, Soft) and optional haptics The pendulum and beat flash are derived from the actual audio output time, so what you see matches what you hear USE BOTH AT ONCE

Tuner and metronome run side by side. When the click plays through the speaker, Centronome knows exactly when it happens and automatically discounts those moments in the pitch confidence. Headphones make simultaneous use even more stable.

NOTHING TO HIDE

An on-screen diagnostics view shows the sample rate, I/O buffer, analysis window, and real-time processing load.

ADS & PURCHASES

Centronome is free to use. A single one-time purchase removes ads permanently — there are no subscriptions.

PRIVACY

Microphone audio is analyzed on-device in real time only. Nothing is recorded, stored, or transmitted.

MADE FOR

Daily tuning of guitar, bass, ukulele, and violin Warm-ups and intonation checks in wind bands and orchestras Vocal pitch training Intonation checks during repair and setup work Observing the tuning state of a piano