Local by design
The signal stays in memory on your device. Stopping or leaving the page closes the microphone stream and audio context.
Online Pitch & Note Detector
Detect pitch, identify the nearest musical note, measure frequency in Hz, and check tuning in cents for an instrument or voice - live in your browser.
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A4 = 440 Hz
What this online pitch detector measures
A single microphone signal becomes three complementary readings, so you can identify the note and see how accurately it is tuned.
- Musical note
- The nearest equal-tempered note and octave, such as A4 or C#3.
- Frequency (Hz)
- The detected fundamental frequency, measured in cycles per second.
- Tuning (cents)
- How far the sound is flat or sharp relative to the selected A4 reference.
YIN / LOCAL DSP
How this pitch detector works
PitchDetect measures repeating patterns in the microphone signal with the YIN method, converts the frequency to the nearest equal-tempered note, and reports the difference in cents.
Filtered for useful results
A noise gate, confidence threshold, and multi-frame smoothing prevent weak or unstable sounds from appearing as certain notes.
For instruments and voice
Use it with guitar, bass, strings, brass, woodwinds, piano tones, humming, or a sustained singing voice.
Pitch and note detector FAQ
Answers about pitch, tuning, privacy, and troubleshooting.
What is the difference between a pitch detector and a note detector?
A pitch detector estimates the fundamental frequency of a sound; a note detector maps that frequency to the nearest musical note. PitchDetect shows the frequency, note, and tuning difference in cents together.
What does A4 = 440 Hz mean?
It sets the A above middle C to 440 cycles per second. Other equal-tempered notes are calculated from that reference. You can adjust the reference from 420 to 460 Hz.
What are cents in tuning?
A cent is one hundredth of a semitone. Negative cents are flat, positive cents are sharp, and values close to zero are in tune with the selected reference.
Is my microphone audio private?
Yes. Analysis runs locally in your browser. PitchDetect does not record, upload, or persist microphone audio, and Stop closes the active media tracks.
Why is no note showing?
Check microphone permission and the selected input, move closer, reduce background noise, and hold one steady note. Weak or unstable input is intentionally withheld. Singers can select their voice range if the octave appears wrong.
Can I use it for both instruments and vocals?
Yes. It works best with a clear, sustained, mostly monophonic sound. Chords, heavy effects, room echo, and background music can make the fundamental pitch ambiguous.