Online Tuner
Turn on your microphone and play a note. The needle shows whether you are flat or sharp.
—
—cents
—Hz
Press the button to begin
Instrument
Strings
Tap a string to hear its reference tone.
Reference (A4)
How to use the tuner
- Press Start tuner and allow microphone access.
- Choose your instrument, or stay on Chromatic for any other instrument.
- Play one clear note. If the needle is to the left the note is flat, so tune up. If it is to the right the note is sharp, so tune down.
- When the needle sits in the green zone in the middle, the note is in tune.
Privacy
Microphone audio is analyzed only in your browser, on your own device. This site has no audio processing server and records or sends nothing.
Frequently asked questions
How accurate is the tuner?
The tuner shows how far off a note is in cents, where 100 cents is one semitone. In practice accuracy depends on your microphone and how quiet the room is, so play close to the microphone.
Why can the tuner not hear me?
Check that your browser has microphone permission. If you declined it earlier, enable it again in the browser’s site settings.
What does A4 = 440 mean?
A4 is the reference note for tuning, and is usually set to 440 Hz. If your group tunes to a different reference, you can change this number.