Privacy Policy

1. Overview

Nail German ("we," "our," or "us") is committed to protecting your privacy. This Privacy Policy explains how our application collects, uses, and safeguards your information when you use our web and mobile applications at nailgerman.com and app.nailgerman.com.

2. Information We Collect

Account Information: When you create an account, we collect your email address and optional profile name via our secure authentication provider (Supabase).

Learning Progress Data: We store your question mastery states (Ampel Leitner streak counts), quiz answers, and exam simulation scores to synchronize your progress across devices.

3. How We Use Your Information

We use your data solely to provide, personalize, and synchronize your German grammar learning experience. We do not sell your personal data to third parties or data brokers.

4. Payments & Billing

Payment transactions are processed securely by Polar.sh (on web) or Apple App Store / Google Play (on mobile). We never store or have access to your full credit card numbers or financial credentials.

5. Contact Us

If you have any questions or wish to request data deletion, contact us at: support@nailgerman.com.