Pitch checker
Real-time pitch detection for voice and guitar. Runs entirely in your browser.
Sing or play into your mic and see the note and how many cents sharp or flat you are, live. It has a guitar mode with reference tones for each string, a noise gate, and a piano you can click for reference notes.
Audio never leaves your device. Pitch detection uses the YIN algorithm, written in plain JavaScript, so it needs no server and works on this site today.