Privacy Policy

Ebbing (the "App") respects the privacy of its users and strives to protect their personal information. This Privacy Policy explains what information the App collects and how it uses that information.

1. Information We Collect

1.1 Account Information

• Basic information provided when you sign in with a Google or Apple account (email address and display name)

1.2 Usage Data

• Information about your study items (study materials)
• The creation and completion status of review tasks
• App usage history (including crash reports)
• How the App is used (such as answers given during the first-run introduction; views, purchases, and dismissals of the purchase screen; and the result of the notification permission request)

1.3 Purchase Information

• The purchase, renewal, and cancellation status of the paid plan (Ebbing Plus). Payment is processed by Apple; the App does not receive credit card or other payment details.

2. Purposes of Use

• Providing the App's features (such as automatically generating review schedules)
• Syncing and backing up data
• Improving the quality of the App and fixing bugs
• Providing customer support

3. Data Storage and Management

Collected information is stored and managed securely using Google Firebase (Google Cloud Platform).

• Storage location: asia-northeast1 (Tokyo region)
• Encryption: Encrypted both in transit and at rest
• Access control: Strictly managed with Firebase Security Rules

4. Provision to Third Parties

The App does not provide users' personal information to third parties, except in the following cases:

• When the user has given consent
• When required by laws and regulations
• When necessary to protect a person's life, body, or property

5. Services Used

• Firebase Authentication: Authentication service
• Cloud Firestore: Database service
• Firebase Crashlytics: Crash report collection
• Google Analytics for Firebase: Measuring how the App is used (the usage information in 1.2 above, together with information such as the device and App version, is sent to Google)
• RevenueCat: Managing the purchase status of the paid plan (the account identifier and the purchase, renewal, and cancellation status are sent to RevenueCat; the email address, display name, and study content are not)

For the privacy policy of each service, please see the following:
Google Privacy Policy
RevenueCat Privacy Policy

6. Data Deletion

Users can delete all of their personal information and data by selecting "Delete Account" on the Profile screen in the App.

However, for users who have ever purchased a paid plan, information about their purchases (such as the date and time of purchase, the plan, the version of the App used to make the purchase, and the days on which they reviewed in the App during the 14 days after purchase) is retained as statistics for improving the service, even after the account is deleted. This information does not include the account identifier, email address, display name, or study content.

7. Contact

If you have any questions about this Privacy Policy, please contact us via the Support page.

8. Changes to This Policy

The App may change this Privacy Policy as necessary. The revised policy takes effect when it is posted on this page.