Privacy Policy

Last updated: March 2026

1. Data Controller

Martin Rost
c/o flexdienst – #20426
Kurt-Schumacher-Straße 76
67663 Kaiserslautern
Email: [email protected]

2. What data does ContactKeeper process?

ContactKeeper exclusively processes the contact data stored on your device. The app accesses your address book via the iOS Contacts API to display, export and import contacts. No contact data is transmitted to our servers or third parties.

3. Local data processing

All contact data is processed exclusively on your device:

  • Export files (CSV, vCard, JSON) are created locally
  • Import files are read locally and written to the iOS address book
  • Duplicate detection takes place exclusively on the device
  • Group management uses the native iOS Contacts API

4. Third-party services

4.1 RevenueCat (In-App Purchases)

We use RevenueCat (RevenueCat, Inc., USA) to manage in-app purchases. RevenueCat processes:

  • An anonymous app user ID
  • Purchase receipts (Apple Receipt)
  • Device type and operating system version

RevenueCat has no access to your contact data. Privacy policy: revenuecat.com/privacy

4.2 TelemetryDeck (Analytics)

For privacy-friendly usage statistics, we use TelemetryDeck (TelemetryDeck GmbH, Germany). TelemetryDeck collects:

  • Anonymized usage signals (e.g., which screens are opened)
  • Device type and operating system version
  • App version

TelemetryDeck collects no personal data, no IP addresses and no contact data. Privacy policy: telemetrydeck.com/privacy

5. Permissions

ContactKeeper requires the "Contacts" permission (CNContactStore) to access your address book. This permission is requested on first launch and can be revoked at any time in the iOS Settings.

6. Your rights (GDPR)

You have the right to:

  • Access to stored data
  • Rectification of inaccurate data
  • Erasure of your data
  • Restriction of processing
  • Data portability
  • Object to processing

Since ContactKeeper does not store any personal data on our servers, these rights primarily concern the third-party services (RevenueCat, TelemetryDeck).

7. Contact

For privacy-related questions, reach us at: [email protected]