Privacy policy

This is what we store, why, and how to get rid of it. Operator: ChatCPA LLC (United States). Contact: help@marklinehq.com.

What we collect

• Your email address, to sign you in with a code and to send you the emails you ask for (study rival notes, product announcements). No password is stored because there is none.
• Your study activity: which questions you answered, what you picked, how sure you said you were, the written answers you submitted and the marks they got, your streaks, duels and rival pairing. This is the product; it is stored so your progress follows you between devices.
• Technical data: IP address and browser type in server logs for security and rate limiting, kept for a short period.
• Analytics: we use Google Analytics to count visits and which features are used. No advertising cookies, no ad networks.

AI marking

When you submit a written answer for marking, the answer text and the question are sent to an AI model provider (Anthropic or OpenAI, under their business terms, which exclude training on your data) to produce the mark sheet. Your email address is not sent with it.

What we do with it

Run the product for you, improve the questions and the marker, and publish aggregate statistics (for example "62% of students get this question right"). Aggregates never identify a person. We do not sell personal data and we do not share it with anyone except the service providers that run the product (Cloudflare for hosting and storage, Resend for email, Google for analytics, the AI providers above).

Where it lives and how long

Data is stored on Cloudflare's infrastructure, which may place it in the United States or the European Union. It is kept while your account exists. Delete your account from the menu in the app and your progress, answers and email are removed within 7 days; aggregate statistics already published cannot be unpublished but do not identify you.

Your rights

You can see your data (export it from the menu), correct it, delete it (delete your account) or ask us anything about it at help@marklinehq.com. If you are in the EU or UK you also have the right to complain to your data protection authority.

Cookies

We use browser storage to keep you signed in and to hold your progress on your device, and Google Analytics cookies for visit counts. No tracking across other sites.

Changes

If this policy changes in a way that matters, we email you. The date above shows the current version.