Privacy Policy
SaunaFlow Privacy Policy
Applies to SaunaFlow (iOS / watchOS)
Summary: Based on the public site copy, SaunaFlow is presented as an app that keeps presets, history, notes, and purchase status primarily on-device and does not describe personal data transmission to external servers.
1. Information handled by the app
| Data type | Content | Storage |
| Presets | Phase structure, duration, set count, name | On-device |
| Session history | Date, completion, score, notes | On-device |
| Purchase status | Premium unlock state | On-device |
| Heart rate (HealthKit) | Recorded on Apple Watch during a session; used only to display your curve and score | On-device |
| External transmission | The public site does not describe personal data transmission | None stated |
2. Data storage
The public product description presents presets, history, and notes as on-device data. The practical privacy advantage is reduced dependence on external servers. The tradeoff is that cross-device web sync is not part of the public positioning.
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 via CloudKit if you enable it).
- 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.
3. In-app purchases
Premium purchases are processed through Apple App Store billing. It is standard for Apple to handle payment details rather than the app developer directly storing them. See Apple's privacy information for Apple's handling of that data.
4. Third-party SDKs and advertising
The current public copy does not describe third-party ad SDKs, analytics SDKs, or crash-reporting SDKs. If that changes later, this page and App Store privacy disclosures should be updated together.