Privacy Policy

Last updated: 12 November 2026

This policy explains what personal data Fuqin Fang ("Sagacia", "we") collects when you use the Service, why, and what choices you have.

1. Data we collect

• Account details you give us: email address, name, gender, year group, school, country or region, whether you are a student, parent or teacher, a contact phone number, and the courses you study.
• Study data: the questions you attempt, your answers (typed, selected or photographed), marks, feedback, grade estimates, explanations you view, follow-up questions you ask, and comments you post.
• Technical data: IP address, browser type and language, time zone, device information, and logs of how the Service is used. We use these to keep accounts secure and to prevent abuse.
• Payment data: payments are handled by Paddle. We receive confirmation of the payment, the amount and your country, but not your full card details.

2. How we use it

• To provide the Service: marking, grade estimates, explanations and your study history.
• To keep the Service secure, prevent fraud and misuse, and enforce our terms.
• To improve marking accuracy and the quality of explanations. Where we use study data for this, we remove names and contact details first.
• To contact you about your account, payments and important changes. We do not send marketing email unless you ask for it.

We do not sell personal data and we do not show third-party advertising.

3. AI processing and service providers

To mark answers and produce explanations we send the relevant question and answer content to AI model providers, and explanation text to a text-to-speech provider. We do not send them your name, email address or phone number. We also use providers for hosting, email delivery and payments. These providers process data on our instructions.

4. Where data is stored

The Service is currently hosted on cloud servers located in mainland China, and some service providers process data in other countries, including the United States and Japan. By using the Service you understand that your data is transferred to and stored in these locations. We are preparing hosting outside mainland China for international users and will update this policy when it is in place.

5. Children and students under 18

The Service is not directed to children under 13 and we do not knowingly collect their data. Students under 18 should use the Service with the permission of a parent or guardian. A parent or guardian can ask us to show, correct or delete a student's data by writing to us.

6. How long we keep data

We keep account and study data while your account is active. If you ask us to delete your account we delete or anonymise your personal data within 30 days, except records we must keep for tax, payment disputes or security reasons.

7. Your rights

Depending on where you live, you may have the right to access, correct, delete or export your personal data, and to object to or restrict some uses. To use these rights, write to support@sagacia.ai from the email address on your account. You can also complain to your local data protection authority.

8. Cookies

We use cookies that are necessary to keep you signed in, remember your language and protect your account. We do not use advertising cookies.

9. Security

We use encryption in transit, access controls and monitoring to protect data. No system is perfectly secure; if a breach affects your data we will tell you as the law requires.

10. Changes and contact

We will post changes to this policy on this page and, for significant changes, tell you by email. Contact: support@sagacia.ai.