Privacy
What MathMux collects, why, and for how long. Last updated 14 September 2026.
Who we are
MathMux is an online educational service: courses, lessons, practice questions and mock exams. This notice covers the MathMux website (mathmux.com). Because our students are often under 18, we have written it to be read by students and parents alike.
What we collect when you visit
When you read a page on MathMux, our own server records the page, the time, and a few facts about your browser so that we can see which pages are used and keep the site working. Specifically:
- the pages you open on this site, and how long each is on screen;
- the site or search engine that sent you here, and any campaign tags in the link you followed;
- your browser, operating system, device type, screen size and language;
- your country — worked out from your internet address using a public data file on our own server. The address itself is used for that lookup and to filter out automated traffic, and is then discarded. We never store it, and we do not record a city or a location.
If you are not signed in, you are counted with a code that changes every day and is not stored on your device — there is no cookie and nothing in your browser's storage. We cannot recognise you again tomorrow, and we do not try to.
No third party receives any of this. There is no analytics company, advertising network or tracking script on MathMux. Everything above is processed on our own server and used only to run and improve the site — never for advertising, and never to build a profile to sell or share.
If your browser sends the Global Privacy Control signal, we count your visit in the day's total and record nothing else.
What we collect when you have an account
When you sign up we hold your name, email address and password (stored hashed), and the learning record you create — lessons opened, questions answered, marks, progress, notes. When you are signed in, the pages you read on this site are attached to your account, so that your teachers and the people who run MathMux can see how you are learning: which lessons you read before a practice set, where you got stuck, and what to help with. This is the educational purpose we collect it for, and the only one.
When you sign in, the sign-in itself records your internet address and browser, so that we can detect an account being shared or used from somewhere unexpected and protect it. That record belongs to the sign-in, not to the page history above.
How long we keep it
- Individual page visits are deleted after 2 years. Daily totals — how many people read a page, from which country — identify nobody and are kept.
- Your account and learning record are kept while you have an account, and deleted when you ask us to close it.
Your choices
- You can ask to see, correct or delete the information we hold about you by writing to us at the address below.
- A parent or guardian may make any of these requests for a student under 18.
- You can withdraw consent to an account at any time by asking us to close it.
Contact
Questions and requests about this notice go to privacy@mathmux.com. We answer within thirty days.