Pitch Detector
Real-time musical pitch detection — free, browser-based
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Pitch Detector
Detect musical pitch in real-time
What is a Pitch Detector?
A pitch detector is a tool that listens to audio through your microphone and identifies the musical pitch in real time. This tool uses the YIN algorithm — a precise autocorrelation method — to find the fundamental frequency of your voice or instrument, then converts it to a standard note name (like A4 or C3), frequency in Hz, and a cents offset showing exactly how sharp or flat you are. It runs entirely in your browser with zero latency and no data ever leaves your device.
Features
How to Use
- 1
Open this page in a browser that supports the Web Audio API (Chrome, Edge, Firefox, Safari).
- 2
Click anywhere on the piano roll or the play button to begin. The browser will ask for microphone permission — allow it.
- 3
Sing a note, play an instrument, or whistle. The note name, frequency, and cents offset appear instantly.
- 4
Watch the colored dots trail across the piano roll to see your pitch history over the last 10 seconds.
- 5
Click the canvas again to pause and inspect the frozen dots. Click once more to resume.
- 6
Use the settings gear to change tuning reference (A4), note label style, octave range, or transpose.