Privacy Policy

Intersect Prep helps students practice SAT math with the Desmos graphing calculator. This policy explains what information we collect, how we use it, who we share it with, and the choices you have. We collect only what we need to run the site, we never sell your information, and we don't show ads.

Information we collect

• Account information. Your email address. If you sign in with Google, Google also gives us your name and profile picture link; we don't use them for anything except your account.
• Age answer. Before you create an account we ask for your birth month and year. We keep only whether you are 13 or older, never the date itself.
• Learning data. The problems you attempt and whether you got them right, timed practice results, techniques and walkthroughs you complete, your diagnostic results, and the test date you set, so your progress follows you between devices.
• Purchases. If you buy a pass, Stripe collects your payment details and billing information to process the payment; we never see or store your card number. We keep a record of your pass (when it starts and ends, the amount paid, and Stripe's reference numbers) so we know what you have access to.
• Feedback. Anything you send with the Feedback button, along with the address of the page you sent it from.
• Technical information. Like most websites, our hosting provider receives your IP address, browser type, and the pages you request, and keeps short-lived logs for security and reliability. We also count page visits with Vercel Web Analytics, which doesn't use cookies and doesn't identify you.
• Stored on your device. The site keeps a copy of your progress and settings (such as sound on or off) in your browser's local storage, and a sign-in cookie that keeps you signed in. Signing out clears your progress from the browser.

How we use it

• To run the site: sign you in, save and sync your progress, and build your study plan.
• To fix problems, answer feedback, and improve the lessons and practice problems.
• To keep the site secure and prevent abuse.

We don't use your information for advertising, we don't build profiles of you for anything other than your own studying, and we don't sell or rent your information to anyone.

Who we share it with

We share information only with the service providers that run parts of the site for us, and only so they can provide those services:

• Supabase: account sign-in and the database that stores your progress.
• Stripe: payment processing for passes, including sales tax and receipts. Stripe may act as the seller of record for your purchase, and its own privacy policy covers the payment information it collects.
• Vercel: website hosting and anonymous visit counts.
• Google: only if you choose to sign in with Google.
• Desmos Studio: the graphing calculator loads from Desmos's servers, which receive standard technical information such as your IP address. Desmos's own privacy policy covers that.
• Our email provider: to send sign-in links.
• Cloudflare Turnstile: checks that the sign-in form is being used by a person, not a bot. It looks at technical signals from your browser and doesn't use them to track you across sites.
• Sentry: crash reports, so we can fix errors. A report includes the page, your browser type, and what went wrong; we set it not to include your email, IP address, or anything you type.

We may also disclose information if the law requires it, to protect the safety of our users or others, or as part of a transfer of the site to a new owner, who would have to honor this policy.

Children under 13

Intersect Prep is not for children under 13, and we do not knowingly collect personal information from them. We ask for a birth month and year once, when an account is created, and keep only whether the answer was 13 or older. Anyone under 13 can't create an account, and an account created before the question is answered is deleted right away if the answer is under 13. If you believe a child under 13 has given us information, contact us at support@intersectprep.com and we will delete it.

Students and schools

Students sign up for Intersect Prep on their own; we don't collect information through schools. We use learning data only to provide and improve the site for you. We never use it for targeted advertising and never sell it.

How long we keep it

We keep your account information and learning data for as long as you have an account. When you delete your account, it is removed from our database immediately; copies may remain in our providers' backups for a limited time before they are overwritten. Feedback and pass records are deleted along with your account. Stripe keeps its own record of payments for as long as tax and financial laws require.

Your choices and rights

• Delete your account at any time from Account settings. This deletes your account and all of its data.
• See or correct your information: your progress is shown throughout the site, or contact us at support@intersectprep.com for a copy of the information we hold about you.
• Clear this device by signing out, or by clearing your browser's site data.

If you are a parent or guardian of a student under 18, you can contact us to review or delete your child's information.

California residents

California law gives residents the right to know what personal information a business collects, uses, and discloses, and to ask for it to be deleted or corrected, without being treated differently for asking. The sections above describe what we collect and why; to make a request, use Account settings or contact us. We do not sell or "share" personal information as California law defines those terms, and we don't disclose personal information to third parties for their own direct marketing.

Do Not Track. We don't track you across other websites, so the site works the same whether or not your browser sends a Do Not Track or Global Privacy Control signal.

Security

Information is encrypted in transit, and our database only lets each signed-in student read and change their own records. No system is perfectly secure, but we work to protect your information and will notify you as the law requires if a breach affects it.

Changes to this policy

If we change this policy we will post the new version here with a new effective date. If a change is significant, we will tell you on the site or by email before it takes effect.

Contact us

Questions or requests about your privacy: support@intersectprep.com.