Privacy Policy

Last updated: October 14, 2026

Information we collect

To provide account, learning, and individual book purchases, we may process your email, profile, sign-in information, learning records, order status, and essential device or access logs. Stripe processes payment details; we do not store full payment credentials.

How we use information

We use this information to operate and improve the service, sync learning progress, confirm purchased-book access, prevent abuse, provide support, and meet legal obligations.

Service providers and international storage

Cloudflare delivers the website, and Supabase stores accounts and learning data in the US West (Oregon) region. Stripe will process payments after checkout opens. Your data may be transferred to and stored outside your country or region.

Retention and security

We retain information only as long as needed for these purposes or legal requirements and use reasonable access controls, encryption in transit, and secret management.

Your choices

The personal-data request channel will be published when the official support inbox is enabled.

Operator

The operator of Lin Xiaoci; its legal name and address will be published before checkout opens.