Pitch Detector
Online Pitch Detector
Detect the musical note and frequency of any sound from your microphone in real time — a free online note detector and tuner.
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play or sing a note
♭ -50¢0¢+50¢ ♯
Audio is processed locally in your browser — nothing is uploaded.
Detect any note in real time
Press Start Microphone and play or sing a note. The pitch detector shows the note name, its frequency in hertz, and a needle that tells you how sharp or flat the pitch is in cents. It’s a quick way to answer “what note is this?”, train your ear, or tune an instrument by ear.
Need the reverse — playing a chosen frequency or note? Use the tone generator.