Instrument tuner

Live microphone tuner: autocorrelation pitch detection shows the nearest note and cents off, A4 = 440 Hz.

Autocorrelation pitch detection on live microphone input, mapped to equal-tempered notes (A4 = 440 Hz). Works for a steady single note — chords and noise are rejected.

Audio never leaves this browser — there is no recording and no upload.

How to use

  1. Start the microphone.
  2. Play a steady single note.
  3. Center the meter — within ±5 cents counts as in tune.

What it supports

60–2000 Hz with a clarity floor that rejects silence and noise. Equal temperament only (A4 fixed at 440). Chords and fast trills are unreliable by design. Frequency shows 1 decimal place and cents read as whole numbers. Audio is never recorded or sent.

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