Privacy Policy for Hanzi Up

Last updated: March 22, 2026

Thanh 子谦 ("we", "our", or "us") operates the Hanzi Up mobile application (the "App"). This Privacy Policy informs you of our policies regarding the collection, use, and disclosure of personal data when you use our App and the choices you have associated with that data.

1. Information Collection and Use

We want to assure our users that Hanzi Up is designed to strictly respect your privacy. We do not require you to create an account, nor do we collect, transmit, or store any directly identifiable personal information (such as your email address, phone number, or real name).

2. Data Deletion

You have full control over your data. If you wish to delete your cloud data (including Leaderboard rankings and profile), you can do so directly within the App by navigating to Settings > Clear All Data or Settings > Reset Stats. Alternatively, you can contact us via email to request data deletion. Once deleted, your anonymous cloud data cannot be recovered.

3. In-App Purchases and Subscriptions (VIP)

Our App offers optional VIP subscriptions (Monthly, Yearly, and Lifetime plans) that unlock additional features such as unlimited saved words, advanced statistics, and more. All payment transactions are securely processed through Google Play Billing (or Apple App Store IAP). We do not process, collect, or store any of your financial information or credit card details on our servers. VIP status and expiry dates are stored locally on your device for verification purposes.

4. Children's Privacy (COPPA Compliance)

Hanzi Up is an educational tool designed for learners of all ages, including users under the age of 13. We are fully committed to complying with the Children's Online Privacy Protection Act (COPPA).

5. Third-Party Services

We use Firebase (Cloud Firestore, Firebase Authentication, Firebase Analytics) to provide cloud-based features such as the Leaderboard and anonymous sign-in. Firebase's services automatically collect certain non-personally identifiable information such as device identifiers and usage statistics for service improvement. Currently, the App does not display third-party advertisements.

Link to the privacy policy of third-party service providers used by the app:

6. Changes to This Privacy Policy

We may update our Privacy Policy from time to time. Thus, you are advised to review this page periodically for any changes. We will notify you of any changes by posting the new Privacy Policy on this page.

7. Contact Us

If you have any questions or suggestions about our Privacy Policy, do not hesitate to contact us at: