Pitch Detector / Tuner
Detect pitch from your microphone in real time — works as an instrument tuner.
—
Play a note to begin
Key features
Play or sing a note near your microphone to see the detected pitch — the nearest musical note, its frequency in Hz, and a needle showing how sharp or flat you are. Works as a chromatic tuner for any instrument.
Pitch is detected locally in your browser using autocorrelation on your microphone’s live audio — nothing is recorded or sent anywhere.
How to use
Press "Start tuner"
Allow microphone access when your browser asks.
Play or sing a note
Hold a single, steady note near your microphone.
Read the result
The note name, frequency, and tuning needle update live.
Frequently asked questions
How does pitch detection work here?
It uses autocorrelation — comparing your microphone's waveform against a time-shifted copy of itself to find the repeating pattern that best matches, which reveals the fundamental frequency. This is a standard, well-established pitch-detection technique that works entirely in your browser.
What does "cents" mean on the needle?
A cent is 1/100th of a semitone. The needle shows how far your pitch is from the nearest note, from -50 cents (flat) to +50 cents (sharp) — dead center means you're perfectly in tune.
Why is the reading jumpy or inaccurate?
Background noise, multiple simultaneous notes (like a chord), or a very quiet signal can all confuse pitch detection — it works best with a single, sustained, reasonably loud note and a quiet room.
Is my audio recorded or uploaded?
No. Your microphone is analyzed live purely to detect pitch — nothing is recorded, stored, or sent anywhere.