Privacy Policy

1. Your health data

• The app reads the following data from your Google account, with read-only permissions and only for the data types you select in the app:
  • Activity & fitness — steps, active energy, distance, floors climbed, VO₂ max
  • Health metrics & measurements — heart rate, resting heart rate, heart-rate variability, weight, body fat, blood glucose, body temperature, oxygen saturation, respiratory rate, height
  • Nutrition — hydration (water intake)
  • Sleep — sleep sessions and stages
  Each permission is requested only when you select a data type that needs it. The data is transferred over an encrypted connection and written into Apple Health directly on your device.
• Your health data is never transmitted to us or to any third party. There is no intermediary server: the transfer happens between Google's API and Apple Health, on the phone in your hand.
• The app does not read anything from Apple Health — it requests write-only access.
• No account is created with us, and we hold no database about you.

2. Google account and permissions

• Sign-in uses Google's official OAuth 2.0 flow. Your Google password is never visible to the app.
• Access tokens are stored securely in the iOS keychain on your device only.
• You can revoke the app's access to your Google data at any time at myaccount.google.com/permissions.
• The app's use of information received from Google APIs adheres to the Google API Services User Data Policy, including its Limited Use requirements: Google user data is used only to provide the sync feature you see, is never sold, never used for advertising, and never read by humans.
• Google user data is never used to develop, improve, or train any AI or machine-learning model, and is never transferred to any AI service.

3. Crash and error reporting (Sentry)

To fix bugs, the app sends automated error reports to Sentry when something goes wrong (for example, a failed import). A report contains technical context: the error type and message, which metric was being synced (e.g. “steps”), device model, iOS version, and app version. Reports contain no health values and no personal identity.

4. Usage statistics (Matomo)

The app sends anonymous usage events — screens viewed, sync started / completed / failed, sign-in / sign-out — to a self-hosted Matomo instance operated by the developer, not a commercial analytics company. Events include the names of the data types you selected and how many data points were imported, but never the health values themselves. No advertising identifier is used, and no data is shared with third parties.

5. Notifications

If you enable automatic sync, the app may show local notifications with the result of a background sync. These are generated on your device; no push-notification service receives your data.

6. Data retention and deletion

• We store nothing about you on any server, so there is nothing for us to delete.
• Imported data lives in Apple Health under your control: delete it in the Health app (Browse → data type → Show All Data), or when uninstalling the app.
• Signing out in the app removes the Google session and all sync settings from the device.
• Crash reports (Sentry) are automatically deleted after 90 days. Usage events (Matomo) are anonymized and aggregated; raw events are deleted after 180 days. Neither contains health values or your identity, and neither can be linked back to you.

7. Children

The app is not directed at children under 13 and does not knowingly collect data from them.

8. Changes to this policy

If the way the app handles data changes, this page will be updated and the effective date above revised. Significant changes will be highlighted in the App Store release notes.

9. Contact

Questions about privacy? Email francois.dab@gmail.com