Online Instrument Tuner - Guitar, Piano, Violin
How Does an Online Instrument Tuner Detect Pitch and Cents Deviation?
An online tuner isolates the fundamental from harmonics using autocorrelation, then reports the deviation in cents. This guide defines concert pitch and explains when a note counts as in tune.
Our instrument tuner utilizes normalized time-domain autocorrelation algorithms to extract fundamental pitches cleanly from complex acoustic harmonic series. A visual cents deviation needle and nixie readout guide accurate string tuning.
Eliminates the frequency-domain bin blurring of basic FFTs in the low-bass range (E1 41Hz), providing sub-cent pitch tracking.
Measures fine pitch error in cents (1 semitone = 100 cents), providing clear guidance on whether strings need tightening or loosening.
A cent is a logarithmic unit of measure for musical intervals, equal to 1/100th of an equal-tempered semitone. Tuning within ±5 cents is virtually indistinguishable to the human ear.
- How accurate is the tuner?
- It reports deviation in cents with 0.1 cent precision, where 100 cents equals one semitone.
- What is the reference pitch?
- A4 = 440 Hz by default, which is the ISO 16 international standard.
- Which instruments does it support?
- Any instrument tuned in 12-tone equal temperament, including guitar, bass, piano, violin, ukulele and voice.
- How does it detect pitch?
- Time-domain autocorrelation isolates the fundamental frequency from the harmonic series produced by string, reed and air-column instruments.
- Does it need an instrument microphone?
- No. It uses the microphone on your device, so no contact microphone or pickup is required.
- Does the audio get uploaded?
- No. Pitch detection runs entirely in your browser and no audio is recorded or transmitted.
Rotary knobs support vertical drag, circular angle tracking, mouse wheel rotation, and touch gestures on mobile with electric contact clicks.
Synthesizes authentic hyperbolic tube warmth with even/odd harmonics, alongside tunable radio static hiss and random contact pops.
Render sustained tones, binaural beats, and logarithmic sweeps to uncompressed 16-bit 44.1 kHz WAV files for testing, acoustic tuning, or sharing.