Pitch Detector
Play or sing a note — the detector identifies it in real time, showing the note name, octave, and cents deviation from perfect pitch.
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Press Start to detect pitch in real time.
Microphone audio is processed locally — nothing is sent to any server.
What Is a Pitch Detector?
A pitch detector (also called a note detector or pitch finder) listens to audio through your microphone and identifies the musical note being played or sung. It shows the note name (A–G), the octave, and the frequency in Hz. Pitch detectors are used for tuning instruments, ear training, transcribing melodies, and checking intonation. This tool uses the McLeod Pitch Method, an autocorrelation algorithm that's particularly accurate for pitched instruments like guitar, bass, piano, and vocals.
What Are Cents in Music?
A cent is 1/100th of a semitone, the smallest unit of pitch measurement in Western music. An octave contains 1,200 cents (12 semitones × 100 cents each). When a note is perfectly in tune, the cents reading is 0. A positive value means the note is sharp (higher than the target pitch); a negative value means it's flat (lower). Most musicians consider ±5 cents acceptable; the difference is barely perceptible. A deviation of ±25 cents or more is clearly audible, even to untrained ears.
How to Use This Pitch Detector
Click “Start Detecting” and allow microphone access when prompted. Play a single note on your instrument or sing a pitch. The tool will display the nearest note and how far off you are in cents. For best results, play notes clearly and avoid background noise. Your microphone audio is processed entirely in your browser using the Web Audio API, and no audio is sent to any server.
Got your notes? Build the complete chord sheet in Chordly — drag chords onto your lyrics and share it with your band.
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