Privacy Policy

Last updated: July 2026

Calmgraph ("the app") is designed with your privacy first. The app runs fully offline and requires no account.

1. Information we collect

The app collects and transmits no information that identifies you. Your check-ins, scores, cause tags, and settings are stored only on your device. Neither the developer nor any third party can access this data.

2. Health data (HealthKit)

Only with your permission, the app reads heart rate variability (HRV/SDNN), resting heart rate, and sleep from HealthKit on a read-only basis to compute your stress score. The app writes no data to HealthKit.

• HealthKit data is processed only on your device, and only the computed score is stored (the raw data is not duplicated).
• HealthKit data is never stored or synced to iCloud or any other cloud.
• HealthKit data is never provided to or shared with third parties.
• HealthKit data is never used for advertising or marketing.

You can change Health permissions anytime in iOS under Settings > Privacy & Security > Health. Even without permission, you can use every feature of the app via subjective check-ins.

3. Tracking & advertising

The app does not perform tracking (ATT) and uses no third-party analytics or advertising SDKs.

4. Deleting your data

Deleting the app from your device deletes all data it stored.

5. Contact

Questions about this policy: freetokyo2020@yahoo.co.jp