online instrument tuner
play a note and see which pitch you are on and how many cents off it is. works for any instrument or voice.
runs on your device · free · no sign-up
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frequently asked questions
how does it detect pitch?
it listens through your microphone and finds the repeating period in the sound using autocorrelation, then converts it to the nearest note.
what is a cent?
a hundredth of a semitone. within about 5 cents most ears hear the note as in tune.
is my audio recorded?
no. it is analyzed live in your browser and never stored or sent.