About PitchDetector.io

What Is a Pitch Detector?

A pitch detector listens to audio input and identifies the musical note being played or sung. It shows the note name, octave, frequency in hertz, and how many cents sharp or flat the pitch is from perfect tuning. Unlike instrument-specific tuners, a pitch detector works with any sound source.

How It Works

PitchDetector.io uses the Web Audio API to capture sound from your microphone and applies an autocorrelation algorithm to determine the fundamental frequency. This frequency is then mapped to the nearest musical note in the chromatic scale. All processing happens locally in your browser — no audio is sent to any server.

Use Cases

• Ear training — verify the notes you hear
• Vocal practice — check your singing pitch
• Instrument tuning — fine-tune any instrument
• Music transcription — identify notes in a melody
• Sound analysis — measure frequencies of any sound