Tuner
← All toolsPlay a single sustained note — a guitar string, a violin open string, a hummed pitch, anything — and perfecttune listens through your microphone, estimates the fundamental frequency with an autocorrelation pitch detector, and swings a brass needle to show how many cents sharp or flat you are against the nearest equal-tempered note.
Microphone audio is processed entirely in your browser and never uploaded.
Tuner
Idle
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Waiting for a signal…
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Microphone audio is processed on-device and never leaves your browser.
How to use the Tuner
- Tap Start and allow microphone access when your browser asks — audio is analyzed locally and never uploaded.
- Play or sing a single, sustained, reasonably loud note. Let it ring; avoid plucking staccato notes.
- Watch the note name and the needle: the needle centers and turns green within 5 cents of true pitch.
- Adjust concert pitch (A4) if you tune to something other than 440 Hz, then tap Stop when you're done to release the mic.
FAQ
- Does my microphone audio get uploaded anywhere?
- No. The microphone stream is only ever connected to a local Web Audio AnalyserNode in your own browser tab — it is analyzed and immediately discarded, frame by frame. Nothing is recorded, saved, or sent to any server.
- Why does it say "No clear pitch"?
- The detector needs a single, sustained, reasonably clean tone. Chords, percussive plucks, background noise, or a very quiet signal won't produce a stable enough waveform to lock onto — let the note ring and try again a little louder.
- What octave range can it detect?
- Roughly 55 Hz to 1500 Hz, which covers a standard 6-string guitar's low E up through several octaves above — comfortable range for guitar, bass, ukulele, violin, and most vocal ranges.
- Can I tune to something other than A440?
- Yes — the concert pitch field accepts any value from 415–466 Hz, so you can match an orchestra tuning to A442 or a period-instrument ensemble tuning lower, and every note name and cents reading updates accordingly.
