Does anything leave my device?

No. Every sound is made in your browser, and your settings stay on your device.

Does it work offline?

Yes. Once this page has loaded, it keeps working without an internet connection.

Check that your device isn't muted and the volume is up. Browsers only play sound after you press a button on the page.

Play a pure tone at any frequency or note, with sine, square, triangle and sawtooth waves, and sweeps.

Does anything leave my device?: No. Every sound is made in your browser, and your settings stay on your device.
Does it work offline?: Yes. Once this page has loaded, it keeps working without an internet connection.
Why can't I hear anything?: Check that your device isn't muted and the volume is up. Browsers only play sound after you press a button on the page.

Ready-made settings for common jobs.

More tools for tuning, timing and practice.

Practise against a note

Microphone, any instrument

BPM, time signatures

Drum machine, loops

Find a song's BPM