Privacy Policy

1. Information handled by the app

Based on the app description and support content, the app handles the following data: Presets (phase structure, duration, set count, name) — stored on-device.

Session history (date, completion, score, notes) — stored on-device.

Purchase status (premium unlock state) — stored on-device.

Heart rate via HealthKit (recorded on Apple Watch during a session; used only to display your curve and score) — stored on-device.

No personal data transmission to external servers is described.

2. Data storage

Presets, history, and notes are stored on-device. The practical privacy advantage is reduced dependence on external servers. Cross-device web sync is not part of the current feature set.

3. Health data (HealthKit)

From v1.

1, SaunaFlow reads your heart rate from HealthKit during a session that uses Apple Watch.

This heart-rate data is used only to visualize your totonoi curve and to factor heart-rate recovery into the Totonoi score.

Heart-rate data is stored only on-device (and in your own private iCloud if enabled).

It is never transmitted to the developer or any third party.

It is never used for advertising or analytics.

HealthKit access is requested on first use and can be revoked anytime in Settings > Privacy & Security > Health.

4. In-app purchases

Premium purchases are processed through Apple App Store billing. The developer does not directly store payment details. See Apple's privacy information at apple.com/legal/privacy for Apple's handling of that data.

5. Third-party SDKs and advertising

The current app does not use third-party ad SDKs, analytics SDKs, or crash-reporting SDKs. If that changes, this page and App Store privacy disclosures will be updated together.

6. Contact

For privacy-related questions, contact us by email: freetokyo2020@yahoo.co.jp