Last updated: September 24, 2026

"Isshin" (the "App") is an iOS screen time app provided by Yuichiro Honda (the "Operator"). This Privacy Policy explains how the App handles information.

1. Our Approach

The App has no account registration and does not collect your name, email address or phone number. What you enter and set up in the App (nickname, age, goal, rules, apps to block, records, etc.) is stored on your device and is never sent to the Operator's servers. Deleting the App also deletes this data from your device.

2. Screen Time Information

The App uses Apple's Screen Time frameworks (Family Controls / DeviceActivity / ManagedSettings) to restrict apps and show your usage. The apps you select and your usage data are managed by iOS and never leave your device. The Operator cannot view or collect them.

3. Health (Step Count)

Only if you use a step-based feature, the App asks for permission to read your step count from Health. Step counts are used only for checks on your device, are never sent outside it, and the App does not write any data to Health.

4. Analytics and Crash Reports

To improve the App and fix bugs, the App uses Google's Firebase Analytics and Firebase Crashlytics and sends the following:

• Records of how the App is used (e.g., a rule was created, a timer was started)
• Attributes such as how you found the App (your onboarding answer), Pro status, number of rules and permission status
• Technical information when a crash occurs, device model, OS version, etc.
• A random ID generated by the App (an identifier that does not identify you personally)

This information is not linked to personal details such as your nickname or age. The App does not track you for advertising (it does not use the IDFA) and does not show ads. For details, see Google's Privacy Policy.