Privacy Policy

Last updated November 13, 2026

Calculus Corner (https://calculus-corner.com) is run by Richard Shumate. This page explains what we collect when you use the site, why, and what you can do about it.

What we collect

• Your account: your name, your email address, and your password, which we store only as a one-way hash (we can't read it).
• Your learning activity: the lessons you open or complete, and your answers, hints, solutions viewed and skips on practice problems. We use these to track your progress and to choose your practice problems.
• Your chats: messages you exchange with the AI tutor and with human tutors.
• Purchases: what you bought and when. Payments are handled by Stripe; we never see or store your card number.
• Basic technical data: your IP address, used briefly to block repeated failed sign-in attempts.

Cookies

We use one cookie, to keep you signed in. We don't use advertising or third-party tracking cookies.

Who else sees your data

• Tutors on Calculus Corner can see your chats with them and your learning progress, so they can help you.
• Anthropic provides the AI tutor. When you message it, your message, the conversation so far, and the lesson or problem you're working on are sent to Anthropic to generate a reply.
• Stripe processes payments, under its own privacy policy.
• Cloudflare delivers the site and protects it from attacks, so your requests pass through its network.

We don't sell your personal information, and we don't use it for advertising.

How long we keep it

We keep your account and learning history while your account exists, so your progress is there when you come back. Purchase records may be kept longer where the law requires it.

Chats are saved. We keep a record of every chat with the AI tutor and with human tutors, and our staff review chats to check the quality of the tutoring and to improve the AI tutor. Please don't share passwords, account details or other personal information in a chat. If your account is deleted, its chats stay in this record under your name, marked as a deleted account; your email, password, progress and the rest of your data are removed.

Your choices

You can ask us for a copy of your data, to correct it, or to delete your account and its data, by emailing [email protected].

Children

Calculus Corner is meant for students aged 13 and over. If you're under 18, please use it with a parent's or guardian's permission. If you believe a child under 13 has created an account, contact us and we'll delete it.

Changes

If we change this policy, we'll update the date at the top of this page.

Contact

Questions about privacy: [email protected].