Privacy Policy

Last updated: 2026-08-23

This Privacy Policy explains how stock-ranking-jp-android (the "App") handles user information.

1. Developer Information

• Developer name: YTree
• Contact email: yun.work.self@gmail.com

Please replace the placeholders above with your actual public contact information before publishing.

2. Information We May Collect

• Device or other identifiers
  ANDROID_ID (Android device identifier)
• Crash and diagnostics data
  Crash logs, exception details, and technical diagnostics collected by Firebase Crashlytics
• User-generated data (when user uses sync features)
  Favorite stock items and UI settings (such as font size, display count, and column display/width settings)

3. Why We Use This Information

• To provide app functionality (including cloud sync and settings restore)
• To maintain app quality, diagnose crashes, and improve stability
• To support troubleshooting and user support

4. How Information Is Collected

• ANDROID_ID may be read automatically to identify cloud sync records.
• Crash information may be sent automatically via Firebase Crashlytics when errors occur.
• Favorites and UI settings may be transmitted when the user runs upload/download sync actions.

5. Third-Party Services

The App uses the following third-party services:

• Firebase Firestore (data storage and sync)
• Firebase Crashlytics (crash reporting)

These services may process data under Google's terms and privacy policy: https://policies.google.com/privacy

6. Sharing with Third Parties

We do not sell personal data. We do not share user information with third parties except:

• as required by law, or
• as necessary to operate the third-party services listed in this policy.

7. Data Retention and Deletion

• Local data may remain on your device until you remove the app or clear app data.
• Cloud-synced data (favorites and UI settings) may be retained as needed for service operation.
• If you want your synced data deleted, contact us at the email listed below.

8. Security

We take reasonable steps to protect information against loss, misuse, and unauthorized access. Data in transit is protected using encrypted communication (HTTPS/TLS).

9. Children's Privacy

The App is intended for a general audience and is not directed to children under 13. We do not knowingly collect personal information from children under 13.

10. International Data Transfers

Because third-party cloud services are used, data may be processed or stored on servers outside your country.

11. Changes to This Policy

We may update this Privacy Policy from time to time due to legal, technical, or service changes. Material changes will be announced in the app or on the policy page.

12. Contact

For privacy-related questions or deletion requests, contact:
Email: yun.work.self@gmail.com