Privacy Policy

Last updated: March 2026

BTU Calculator ("the app") is a radiator heat-loss calculator that runs entirely on your device. This policy explains what data the app does and does not collect.

Data we collect

None.

The app has no analytics, no crash reporting, no advertising SDKs, and makes no network requests. Room dimensions and saved calculations are stored only in your device's local storage and never leave your device.

Data stored on your device

When you save a calculation it is written to your device's local storage. This data is:

• stored only on your device;
• never transmitted to any server;
• removed when you delete the app.

Third-party services

The app uses no third-party services, SDKs, or APIs. It does not connect to the internet at all during normal use.

Children

The app is rated 4+ and is suitable for all ages. Because we collect no data, there are no special provisions required for children's privacy.

Changes to this policy

If we ever change how the app handles data we will update this page and increment the "Last updated" date above.

Contact

Questions? Open an issue at github.com/rikwatson/btu/issues .