Privacy Policy

1. Information We Collect

We collect the following information when you create an account or use our app:

• Account Information: Name, email address, and optional nationality (country)
• Learning Data: HSK level progress, mastered words, practice scores, streaks, and XP points
• Usage Data: App preferences such as chosen translation language, UI language, and pinyin display settings
• Purchase Information: Subscription status (managed via RevenueCat and Apple App Store)

2. How We Use Your Information

We use your information to:

• Provide and personalize the learning experience
• Track and display your learning progress
• Manage premium subscriptions and purchases
• Improve our vocabulary content and app features based on usage patterns
• Send account-related emails (e.g., password reset)

We do not sell your personal data to third parties.

3. Data Storage & Security

Your data is stored securely using Supabase (a GDPR-compliant cloud database platform). We implement industry-standard security measures including:

• Encrypted data transmission (HTTPS/TLS)
• Secure authentication via Supabase Auth
• Row-level security policies on all database tables

4. Third-Party Services

We use the following third-party services:

• Supabase – Database and authentication (Privacy Policy)
• RevenueCat – Subscription management (Privacy Policy)
• Apple App Store – App distribution and in-app purchases (Privacy Policy)

5. Data Retention

We retain your data for as long as your account is active. You may request deletion of your account and all associated data at any time by contacting us.

6. Children's Privacy

Our app is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us immediately.

7. Your Rights

Depending on your location, you may have the following rights:

• Access the personal data we hold about you
• Request correction of inaccurate data
• Request deletion of your data ("right to be forgotten")
• Export your data in a portable format
• Withdraw consent at any time

8. Analytics & Tracking

We do not use any third-party analytics or advertising SDKs. We do not track you across other apps or websites. The only data collected is what is necessary to provide the learning service.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by updating the "Last updated" date at the top of this page. Continued use of the app after changes constitutes acceptance of the revised policy.