⚡ Deutsch Challenge

Privacy Policy — Last updated: March 2026

1. Introduction

Deutsch Challenge ("we", "our", "the app") is a German language learning application. We respect your privacy and are committed to protecting your personal data. This privacy policy explains what data we collect, how we use it, and your rights.

2. Data We Collect

We collect the following data to provide and improve the app experience:

• Account Information: When you sign in with Google, we receive your email address, display name, and a unique user ID. This is used for authentication and to save your progress.
• Nickname: A display name you choose, shown on the leaderboard. This is stored in our database.
• Learning Progress: Your quiz scores, word history, streak data, ELO rating, and arena match results. This data is stored locally on your device and synced to our servers.
• Device Information: Basic device information may be collected by third-party services (Google AdMob, Firebase) for analytics and ad delivery.

3. How We Use Your Data

• To provide and maintain the app's features (progress tracking, leaderboard, arena matches)
• To authenticate your identity via Google Sign-In
• To display personalized learning statistics
• To show relevant advertisements (free version only, via Google AdMob)
• To improve the app experience based on usage patterns

4. Third-Party Services

We use the following third-party services that may collect data:

• Google Firebase: Authentication, real-time database, and analytics. Firebase Privacy Policy
• Google AdMob: Advertisement delivery (free version). Google Privacy Policy
• Google Play Billing: Subscription management (Pro version). Payment data is handled entirely by Google.

5. Data Storage & Security

Your learning progress is stored locally on your device and synced to Firebase servers (hosted by Google). We do not sell, trade, or share your personal data with third parties beyond what is described above. Data is transmitted securely via HTTPS.

6. Children's Privacy

Deutsch Challenge is suitable for users of all ages. We do not knowingly collect personal information from children under 13 without parental consent. If you believe a child has provided us with personal data, please contact us.

7. Advertisements

The free version of Deutsch Challenge displays advertisements via Google AdMob. AdMob may use device identifiers and cookies to serve relevant ads. Pro subscribers do not see advertisements. You can learn more about Google's advertising practices at Google Ad Policies.

8. Your Rights

You have the right to:

• Access the personal data we hold about you
• Request deletion of your account and associated data
• Opt out of personalized advertisements (via your device's ad settings)
• Sign out at any time to disconnect your Google account

9. Data Deletion

To delete your account and all associated data, please contact us at the email below. We will process your request within 30 days. You can also uninstall the app to remove all locally stored data.

10. Changes to This Policy

We may update this privacy policy from time to time. Any changes will be reflected on this page with an updated date. Continued use of the app after changes constitutes acceptance of the updated policy.