Privacy Policy
The original of this page is in Japanese; the English version is machine-translated by AI and may contain errors.
1. Information We Collect
This site may collect the following information:
・Email address (at registration)
・Display name (at registration, optional)
・Learning history (questions answered, correctness, response time)
・Google account information (only when Google login is used)
2. Purpose of Use
The collected information is used for the following purposes:
・Managing and displaying learning history
・Sending password reset emails
・Operating and improving the service
・Preventing unauthorized access
3. Provision to Third Parties
We do not provide collected personal information to third parties except as required by law.
4. Use of Cookies
This site uses browser local storage and cookies for the following purposes:
・Saving language settings
・Maintaining login state (JWT token)
・Controlling display of the disclaimer modal
・Temporarily storing the learning history of guest users
If you disable cookies in your browser settings, some features may become unavailable.
5. Access Analysis and Advertising
This site uses Google Analytics (GA4) to understand access trends. Google Analytics uses cookies to collect and analyze usage data. The collected information is aggregated anonymously and does not identify individuals. For details, please see Google's Privacy Policy.
In addition, this site is considering introducing Google AdSense in the future. If introduced, this policy will be updated accordingly.
6. Data Retention and Deletion
Data of registered users is retained until the service ends. If you wish to delete your account, please contact us via the form listed in the "Contact" section at the bottom of this page.
7. Security
Passwords are hashed with bcrypt before storage. We never store plaintext passwords on the server.
8. Changes to This Policy
This policy may be changed without notice. If there are significant changes, we will announce them on the site.
9. Contact
For inquiries regarding personal information, please contact us via the contact form. For details about the operator, please see Operator Information.