Privacy Policy — Jishin Sensei

Last updated: August 12, 2026

Jishin Sensei ("the app") is developed and operated by Makoto Katano (sukunabicco).

The short version

The app has no accounts, no ads, no analytics, and collects no personal information. We don't want your data.

What stays on your device

Your quiz answers, streak, and preferences are stored only on your device. They are never uploaded to any server, and deleting the app deletes them.

In-app purchases

Purchases are processed by Apple through the App Store. To deliver purchases and restore them across reinstalls, the app uses RevenueCat, a purchase-management service. RevenueCat receives a randomly generated anonymous identifier and App Store purchase receipts. It does not receive your name, email address, Apple Account, or any contact information from us.

External links

The app links to official public-safety resources (such as the Japan Meteorological Agency, the Japan National Tourism Organization, and mobile carriers' alert-sound demonstration pages). When you open those links, the respective sites' own terms and privacy practices apply.

Emergency information disclaimer

The app's safety content is educational and based on official public sources. In an actual emergency, always follow instructions from local authorities.

Changes

If this policy changes, the updated version will be posted at this page with a new "Last updated" date.

Contact

Questions about this policy: please open an issue via the support page, or contact the developer via the App Store product page.