About

A simple browser tuner for string instruments. No ads, no accounts, no paywalls — just tune and get back to playing.

How to use

Play a string and the app detects the pitch. Tap a string to lock it, or leave it on Auto to follow whatever you play.

Is it really free?: Yes. No ads, no accounts, no paywalls, no upsells.
Does it work offline?: Yes. After the first load, the app and every tuning you have stored works offline.
How accurate is it?: Within ±1 cent on a clean signal, well below the threshold humans can hear.
Does it work on phones?: Yes. Any modern iOS or Android browser. Microphone access requires HTTPS.
Where are my custom tunings stored?: In your browser's local storage on this device. No account, no server, no sync — they never leave your device. Clearing browser data will erase them.
How do I create a custom tuning?: Open any instrument page and tap "New tuning". Pick each string's note and octave, name it, and save. For instruments not in the list, choose "Other" and add as many strings as you need.