How it works
Online Pitch Detector
A pitch detector listens to a short sample from your microphone and estimates its fundamental frequency. That frequency is converted to the nearest equal-tempered musical note using your selected A4 reference pitch.
Use it for singing practice, checking an instrument, matching a reference note, or answering “what pitch is this?” without installing an app.
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For best results, use a quiet room, keep the microphone close to the sound source, and hold one clear note at a time.