Grant mic access
Press Start tuner and allow microphone access when your browser asks — this requires a direct user click.
Instrument Tuner
Play a note near your microphone and get an instant note name, frequency, and cents-off-pitch reading powered by real-time autocorrelation pitch detection.
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Press Start tuner and play a note
How it works
Play a note
An autocorrelation algorithm analyzes the raw waveform in real time to find its fundamental frequency.
Read the gauge
The nearest note, its frequency, and how many cents flat or sharp you are appear instantly, with a needle showing direction.
FAQ
How does the pitch detection work?
It runs a standard autocorrelation algorithm on the raw microphone waveform to find the fundamental period, converts that to a frequency, then maps the frequency to the nearest musical note using the equal-temperament formula 69 + 12 log2(freq/440).
Is my microphone audio recorded or uploaded?
No. The microphone stream is analyzed locally in your browser using the Web Audio API and is never recorded to a file, uploaded, or sent anywhere.
What if I deny microphone access?
The tuner shows a clear message explaining that microphone access was denied and how to re-enable it in your browser's site settings, without breaking the rest of the page.