Free online instrument tuner

VIRTU
TunerInput · Off

Turn on the microphone to start

Allow microphone access

The tuner needs the microphone to hear your instrument’s pitch. Audio is never recorded or uploaded.

Octave
A4 Hz440

Piano practice that remembers

The tuner is just the start

Virtu listens to you play, catches the wrong notes, and has today's bars ready before you start

Explore the app

Free on iOS and Android, no ads

There's a metronome too

Online metronomeDraw an accent on every beat, then practice with a speed ramp or silent bars

Tune any note, or just your open strings

Chromatic mode covers the full range. A preset narrows the target to your instrument’s open strings, so the reading stays clear even when harmonics or nearby notes ring.

  • Chromatic · all notes
  • Guitar 6-string · standard (E-A-D-G-B-E)
  • Guitar 6-string · Drop D (D-A-D-G-B-E)
  • Guitar 7-string · standard (B-E-A-D-G-B-E)
  • Guitar 6-string · Open G (D-G-D-G-B-D)
  • Bass 4-string · standard (E-A-D-G)
  • Bass 5-string · standard (B-E-A-D-G)
  • Ukulele · C tuning (G-C-E-A)
  • Violin · standard (G-D-A-E)
  • Mandolin · standard (G-D-A-E)

Frequently asked questions

Does it work on phones and tablets?

Yes. It works in Safari, Chrome, and other modern browsers on iOS, Android, and desktop, with nothing to install. Tap “Allow microphone” and play a note.

Is my audio recorded or uploaded?

No. Audio is analyzed in real time inside your browser with the Web Audio API. Nothing is recorded, stored, or sent to a server, and the microphone turns off as soon as you stop the tuner or close the tab.

Which reference pitch (A4) should I use?

Most of the time, the standard A4 = 440 Hz is right. Orchestras and ensembles with piano often use 442 Hz. You can choose any value from 416 to 466 Hz at any time.

Chromatic mode or a preset: which should I use?

Chromatic mode detects any note across the full range, so it suits winds, piano, and alternate tunings. A preset focuses on your instrument’s open strings, so other sounds are less likely to throw you off and tuning goes faster.

How do I get a steady reading?

Rest your hand on the other strings so they don’t ring along, then play one note clearly and let it sound for 1–2 seconds. Turn the peg slowly until the needle settles at 0 cents.