Privacy Policy
Last updated: March 11, 2026
1. Information We Collect
When you create an account, we collect your email address and a display name/username. Authentication is handled by Supabase, a third-party service.
When you use Preffus, we collect:
- Book ratings and reviews you submit
- Book lists you create
- Profile information you choose to provide (bio, favorite genres)
- Usage data such as pages visited and features used
2. How We Use Your Information
- To provide and improve the Preffus service
- To display your public ratings, reviews, and book lists
- To communicate with you about your account
- To aggregate anonymous content ratings for books
3. Public Information
Your username, ratings, reviews, and book lists are publicly visible. Your email address is never displayed publicly.
4. Third-Party Services
We use the following third-party services:
- Supabase — authentication and database hosting
- Open Library — book data and cover images
- Google Books — supplemental book descriptions and cover images
- Amazon Associates — affiliate purchase links. When you click an Amazon link on Preffus, Amazon may collect information per their own privacy policy.
- Vercel — website hosting
5. Cookies
We use essential cookies to manage your authentication session. We do not use advertising or tracking cookies.
6. Data Retention
Your account data is retained as long as your account is active. You can request deletion of your account and associated data by contacting us.
7. Children's Privacy
Preffus is not directed at children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us.
8. Changes to This Policy
We may update this policy from time to time. We will notify users of material changes by updating the "Last updated" date at the top of this page.
9. Contact
If you have questions about this privacy policy or wish to request data deletion, please contact us at support@preffus.com.