Online Tuner
Play a note and the needle shows how many cents you are from the nearest pitch.
Reference tone
Sound is analysed on your device and never sent anywhere.
Play a note and the needle shows how many cents you are from the nearest pitch.
Any instrument or voice
Chromatic mode names every note from A0 to C7. Switch to guitar, bass, ukulele, violin or cello for string presets and tones.
Your reference pitch
Set A4 anywhere from 415 to 466 Hz: 440 is standard, 442 suits most orchestras, 415 is baroque pitch.
Questions
Is the online tuner accurate?
Yes. It reads pitch to about one cent; a note within ±5 cents shows green.
Is my microphone recorded?
No. Sound is analysed on your device and never leaves it.