Privacy Policy

1. Information We Collect

The App may collect the following information:

• Learning history, progress status, accuracy rates, and review interval data
• Created flashcard deck data (words, meanings, settings, etc.)
• User-set username (optional)
• Learning settings (review intervals, notification settings, display language, etc.)
• Device information (OS, device type, app version)
• Crash reports and error logs
• Language and region settings

2. Purpose of Use

The collected information is used for the following purposes:

• Providing and personalizing learning features
• Calculating review timing based on forgetting curves
• Recording and displaying learning progress
• Bug fixes and performance improvements
• Improving and customizing user experience
• Statistical analysis and service improvement
• Customer support

3. Data Storage

Learning data, flashcard data, progress information, and other user-related learning information are primarily stored on the device. Some data may be stored on cloud servers for service improvement, but is encrypted and securely managed in a way that does not identify individuals.

4. Third-Party Disclosure

We will not provide personal information to third parties except in the following cases:

• When user consent is obtained
• When required by law
• When necessary to protect life, body, or property

5. External Services

To improve app quality, we may use the following external services:

• Google Analytics (anonymous usage statistics)
• Firebase Crashlytics (crash reports)
• Firebase Cloud Firestore (learning data sync and backup)

These services handle information according to their respective privacy policies.

6. Notification Features

The App may send push notifications for learning reminders. Notification settings can be changed or disabled at any time from within the app or device settings.

7. Data Storage and Deletion

Learning data is stored on the device and in the cloud. It can be completely deleted by uninstalling the app or deleting your account. You can also reset stored data from the app settings.

8. Children's Privacy

The App is suitable for all ages and does not intentionally collect personal information from children under 13. Parents should appropriately supervise their children's use of the app.

9. Security

The App implements appropriate technical and organizational measures to ensure information security. We conduct data encryption, access control, and regular security audits, but cannot guarantee complete security.

10. Policy Changes

This Privacy Policy may be updated as necessary. Important changes will be notified within the app.

11. Contact

For inquiries regarding this Privacy Policy, please contact: