A guitar tuner for iPhone

Henry's Tuner

Open it. Play a string. Tune.

Fast pitch response, a precise cents meter, alternate tunings, and personal reaction photos. No ads, accounts, subscriptions, or uploaded audio.

How it works

The whole instrument

Nothing between you and the note.

Listening starts automatically after microphone permission. There is no start button.

The note stays readable while the needle and cents value retain fine-grained movement.

Choose local photos for flat, sharp, and in-tune reactions. They never leave your phone.

Support

For tuning, microphone, or reaction-photo questions, email hi@henryzoo.com.

Include your iPhone model and iOS version when reporting an audio issue.