Unison Privacy Policy

Last updated: October 23, 2026

Unison is a free piano tuning app for iPhone and iPad. Unison does not collect any data.

Microphone audio

Unison uses the microphone to hear your piano and measure pitch and the beats between strings. The audio is analyzed on your device, in memory, while you tune. Unison never records audio to a file, never stores it, and never sends it anywhere.

Data we collect

None. Unison has no account, no sign-up, no analytics, no advertising, no tracking and no crash reporting service. The app does not connect to the internet.

Data stored on your device

• Settings such as A4, temperament and display choice.
• Piano files (name, tuning reference, measured inharmonicity, tuning history) in Files > On My iPhone > Unison.

These files leave your device only when you share or export them, or when your own device backup includes them. Delete the app to delete all of this data.

Children

Unison does not collect data from anyone, including children.

Third parties

Unison contains no third-party code that collects data. We do not sell or share data, because we have none.

Changes

If this policy changes, the new version will be posted at this address with a new date.

Contact

Questions: [email protected].