Music tools
Instrument tuner
Tune your instrument by microphone. Audio is processed in your browser and never uploaded.
Press Start and allow microphone access to begin tuning.
How it works
Tune your instrument using your device microphone. Grant access, play a note, and the tuner detects the pitch, shows the nearest note name, and tells you how many cents sharp or flat you are with a moving needle - center is in tune. It uses an autocorrelation pitch detector, which is robust for the steady, sustained notes you play while tuning, and you can set the A4 reference if you tune to something other than 440 Hz.
All of the audio is analyzed on your device in real time; nothing is recorded or uploaded, and the microphone stream stops as soon as you stop the tuner. If permission is denied or no microphone is found, the tool says so clearly instead of failing silently.
Example. Pluck the low E string on a guitar. The tuner reads "E2" and the needle sits 8 cents flat, so you tighten slightly until it centers and the readout holds steady at E2, 0 cents.
FAQ
How does the tuner detect pitch?
It captures sound from your microphone and runs an autocorrelation algorithm, which finds the repeating period of the waveform to estimate the fundamental frequency. That frequency is mapped to the nearest note and a cents offset.
What does "cents" mean?
A cent is one hundredth of a semitone. The tuner shows how many cents you are above (sharp) or below (flat) the target note; zero cents means perfectly in tune. A few cents off is usually inaudible.
Do I need to install anything or allow the microphone?
No install - it runs in the browser. It does need permission to use your microphone, which the browser asks for when you start. If you deny it, the tuner cannot hear your instrument and will tell you.
Is my microphone audio uploaded?
No. The audio is analyzed locally in your browser and never leaves your device. The microphone stream is released as soon as you stop the tuner.