Privacy Policy

1. Introduction

This Privacy Policy describes how Jumpei Naka (“we”, “us”, or “our”) handles user information in the iOS application “Lustrous ToDo” (“the App”).

Please read this Privacy Policy carefully before using the App. By using the App, you are deemed to have agreed to this Privacy Policy.

2. Information We Collect

The App collects the following information.

2.1 App Usage (Firebase Analytics)

To improve the app and user experience, we automatically collect:

• Device identifier (IDFV)
• App usage (launches, screen views, events)
• Device information (model, OS version, language, time zone)
• Approximate location (country/region inferred from IP address)

2.2 Crash Information (Firebase Crashlytics)

To improve app stability, we automatically collect:

• Crash reports (stack traces, device state at error time)
• Device information (model, OS version, memory state)
• App version

2.3 Performance (Firebase Performance)

To improve app performance, we automatically collect:

• App launch time
• Screen render time
• Network request statistics (URL, response time, status code)

2.4 Purchase Information (RevenueCat)

To manage in-app purchases, we collect:

• Purchase history (anonymized via Apple)
• Subscription status
• Anonymous user ID

2.5 Contact Information

When you contact us, we may collect:

• Email address

3. How We Use Information

We use the collected information to:

• Provide, operate, and maintain the App
• Improve the App and develop new features
• Detect, diagnose, and fix crashes and errors
• Analyze and optimize performance
• Process and manage in-app purchases
• Respond to your inquiries
• Perform statistical analysis of usage

4. Third-Party Sharing

We share information with the following service providers. They are contractually required to use the information only on our behalf and not to disclose or use it for other purposes.

4.1 Google LLC (Firebase)

• Services: Firebase Analytics, Firebase Crashlytics, Firebase Performance
• Purpose: App usage analysis, crash reporting, performance monitoring
• Privacy policy: https://policies.google.com/privacy

4.2 RevenueCat, Inc.

• Service: RevenueCat
• Purpose: In-app purchase management
• Privacy policy: https://www.revenuecat.com/privacy

5. Data Storage

Collected information is stored on the servers of the third-party providers listed above. Each provider applies industry-standard security measures to protect the information.

We delete email addresses obtained for support purposes within a reasonable period after the inquiry is resolved.

6. Contact Handling

When you contact us by email, we use your email address only to respond. We do not use it for any other purpose.

7. Your Rights

You have the right to:

• Access: Request access to your personal information we hold
• Correction: Request correction of inaccurate personal information
• Deletion: Request deletion of your personal information
• Data portability: Receive your personal information in a structured format

To exercise these rights, please contact us using the details below.

You can also limit some data collection by adjusting ad tracking in your device settings.

8. Children’s Privacy

The App is not directed at children under 13, and we do not knowingly collect personal information from children under 13. If we learn that we have received personal information from a child under 13, we will take steps to delete it promptly.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of changes in the App or on our website. Continued use of the App after changes constitutes your acceptance of the updated Privacy Policy.

For significant changes, we will notify you through in-app notices or other appropriate means.

10. Contact

For questions about this Privacy Policy or our handling of personal information, please contact: