Privacy Policy

1. Introduction

Hanzijo (“we,” “our,” or “us”) is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use the Hanzijo mobile application and website (collectively, the “Service”).

2. Information We Collect

Account Information

When you create an account, we collect your email address and display name. If you sign in with Apple or Google, we receive only the information you authorize those services to share.

Learning Data

We store your learning progress — lessons completed, review history, test scores, and SRS scheduling data. This data is essential for the app to personalize your study and function correctly.

Device Information

We may collect basic device information such as device type, operating system version and app version for debugging and improving the app.

3. How We Use Your Information

• Provide and personalize your Chinese learning experience
• Sync your progress across devices
• Process in-app purchases and subscriptions
• Send service notifications you have opted into
• Improve app performance and fix bugs
• Ensure account security

4. Data Storage & Security

Your data is stored using secure cloud infrastructure with industry-standard encryption. Learning data is encrypted both in transit (TLS) and at rest (AES-256). We apply strict access controls to protect your information.

5. Data Sharing

We do not sell, trade, or share your personal information with third parties for marketing purposes. We may share data only:

• Service Providers: trusted providers for cloud storage, analytics and crash reporting, used solely to operate and improve the app.
• Legal Requirements: when required by law or valid legal process.

6. Camera & Image Processing (OCR)

Hanzijo offers an optional OCR feature that lets you capture or select images containing Chinese text to look up hanzi and vocabulary.

• On-Device Processing: all image processing and text recognition is performed entirely on your device. No images are uploaded to our servers or any third party.
• No Image Storage: images are processed temporarily in memory and never saved or transmitted. The image is discarded immediately after recognition.
• Permissions: the app requests camera and photo library access only when you choose to use OCR. You can revoke these permissions any time in your device settings without affecting other features.

The only data retained from OCR is the list of matched hanzi/vocabulary IDs (from our local database) if you choose to save the results as a flashcard collection.

7. Advertising

Hanzijo prioritizes your learning experience. We do not show intrusive, pop-up, or interruptive ads during study sessions. For free users, ads appear exclusively as opt-in rewarded ads — you only see one when you actively choose to (for example, to unlock an extra lesson). When you watch a rewarded ad, a third-party ad provider (such as Google AdMob) may collect limited device identifiers to serve the ad, handled under that provider’s privacy policy. Premium subscribers enjoy a completely ad-free experience.

8. Push Notifications

With your explicit consent, Hanzijo may send study reminders, SRS review-due alerts, streak alerts and important account updates. You can enable or disable notifications any time in your device settings (Settings > Notifications > Hanzijo) or within the app. We collect only a device token to deliver notifications; it contains no personal information and is never used for advertising or tracking.

9. Your Rights

• Access your personal data
• Request correction of inaccurate data
• Request deletion of your account and all associated data
• Export your learning data
• Opt out of non-essential communications

To exercise any of these rights, contact us at support@hanzijo.com.

10. Account Deletion

You can request account deletion any time through the app settings or our account deletion page. When you delete your account, all personal data and learning progress is permanently removed within 30 days.

11. Children’s Privacy

Hanzijo is not directed at children under 13. We do not knowingly collect personal information from children. If you believe we have, please contact us immediately.

12. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes through the app or by email. Continued use after changes constitutes acceptance of the updated policy.

13. Contact Us