Last updated: 2026-05-24
We collect the following information:
• Account information: Email address (used for authentication)
• Profile information: Nickname, gender, avatar image (optional)
• Learning data: Registered book information, daily study logs, task information
• Usage information: App usage, page views (for improvement analysis)
• Payment information: Subscription status (actual credit card information is processed by Apple/Google; we never receive it)
We use collected information for the following purposes:
• To provide and operate the Service
• To respond to user inquiries
• To improve the Service and develop new features
• To prevent and address violations of the Terms of Service
• To provide and manage paid plans
We do not provide users' personal information to third parties except in the following cases:
• With user consent
• When required by law
• When providing to service providers within the scope necessary for service delivery:
- Supabase (database and authentication infrastructure)
- RevenueCat (subscription management)
- Vercel (web application hosting)
- Apple / Google (payment processing)
User data is retained as long as the account is active.
You can delete your account at any time from within the app: go to Settings → About → More Options → Delete Account. Once deleted, your data cannot be recovered.
We implement appropriate security measures to prevent unauthorized access, loss, leakage, etc. of users' personal information.
We use communication encryption (SSL/TLS), database access control, and regular security reviews.
Users may request disclosure, correction, deletion, or suspension of use of their personal information.
Please contact us using the information below. We will respond within a reasonable scope after identity verification.
The web version of the Service uses cookies to save language and theme settings.
These cookies do not identify individuals and can be disabled in browser settings.
This policy may be changed as necessary. If there are important changes, we will notify you within the app or via email.
For privacy-related inquiries:
zeuscult@outlook.com