Free tuner for guitar, bass, cuatro and ukulele, right in your browser.
Press Start and allow the microphone.
Tap a string to hear its note and tune only that string.
The sound is analyzed on your device. Nothing is recorded or sent anywhere.
I'm Alfred, the producer and composer who built this tuner. I record session guitar and bass, write, produce and mix songs, and create original music for ads, film and games. All from my studio in Buenos Aires, for clients worldwide.
Request a quoteHear my work →A free tuner that runs right in your browser, on a computer or a phone, with no app and no sign-up. Tune a guitar in standard, Drop D or half a step down, a 4 or 5-string bass, a Venezuelan cuatro or a ukulele, or use chromatic mode for any instrument. Tap a string to hear its reference note, and set A4 anywhere from 432 to 446 Hz.
Choose Guitar, press Start and allow the microphone. Play one open string at a time: the tuner finds the closest string on its own. Turn the tuning peg until the needle sits in the center and turns green. If you are far off, tap the string you are tuning so it only listens for that note.
From the fourth string to the first: A, D, F♯ and B (La, Re, Fa♯ and Si). The first string, B, sounds lower than the third, F♯, because the cuatro uses a re-entrant tuning. Choose Cuatro and tap each string to hear it.
It sets the pitch of the A above middle C, which the rest of the notes follow. The standard is 440 Hz. Change it to match a piano, a recording or a band that tunes a little higher or lower, or to try 432 Hz.
It needs to hear your instrument. The sound is analyzed on your device and is never recorded or sent anywhere. It stops listening when you press Stop or switch tabs.