WATAROnline Tuner
A free chromatic tuner that works for any instrument — guitar, oud, violin, ukulele, bass, voice, or anything else. Runs entirely in your browser.
Tune anything, right here
Your microphone audio is analyzed live in your browser using the Web Audio API and is never recorded, saved, or sent anywhere — the same on-device-only approach the Watar app itself uses. Requires a secure (https) connection; works in current Chrome, Safari, Firefox, and Edge.
Looking for a specific instrument?
These pages preset the tuner to that instrument's standard strings:
How it works
The tuner listens through your microphone and uses autocorrelation — a standard pitch-detection technique — to identify the fundamental frequency of the note you're playing, then shows how far it is (in cents) from the nearest in-tune note. It's the same detection approach used inside the Watar app itself.