Mathigon: interactive maths courses and what its pages say on free use and data
Mathigon is an interactive maths site. Its homepage says it offers free tools, courses and manipulatives.
What it is
Mathigon is a maths learning website. Its homepage calls it "The Mathematical Playground" and says it offers "Free tools, courses and manipulatives to make online learning more interactive and engaging". The About page describes it as "part interactive textbook and part virtual personal tutor", where students work through small sections by solving problems and exploring simulations before the next part opens. It is aimed at students who want extra help or want to go beyond school, and at teachers.
Is it free?
The homepage says free tools, courses and manipulatives, and we saw no price on the pages we read. The homepage also says Polypad, its manipulatives tool, "has moved from Mathigon to Amplify" and points to FAQs. We did not read those, so we do not say what Polypad costs or needs now.
What is in the course library, per Mathigon
- The Course Library groups courses under Geometry, Numbers and Algebra, and Probability and Applications.
- Examples listed: Euclid's Axioms, Origami and Paper Folding, Symmetry, Triangles and Trigonometry, Pythagoras' Theorem, Fractals and the Mandelbrot Set, Fibonacci Numbers and the Bridges of Konigsberg.
- Some entries on the page are marked "Under construction", so not every course is finished.
How it teaches, per the About page
- Students "have to actively participate at every step", with problems, simulations and pattern-finding.
- It says it builds an internal model of how well a user knows related concepts, called the knowledge graph, to adapt the content and predict where a student may struggle.
- It says a virtual personal tutor guides you through explanations "in a conversational interface" with hints, and that students "can even ask their own questions". We did not test how this works.
Privacy and data
- The legal page says Mathigon is part of Amplify Education, Inc. in Brooklyn, New York, and that its privacy policy and acceptable use policy last changed on 6 July 2023, with privacy@amplify.com for questions.
- We did not read the privacy policy itself, so we make no claim on what data is collected. The About page says it models what a user knows, so assume progress data is kept if you sign in. That is our reading.
- The site has a sign-in option. We did not check which features need an account.
What to watch out for (our advice)
- If a child uses it, read the privacy policy and check which features need an account first.
- It is a supplement. The About page itself says it is not meant to replace schools or teachers.
India
- The site has a language menu with many flags, including an India flag. We did not check which languages or courses are available in them, so we make no claim. No price applies.
Frequently asked questions
Is Mathigon free?
The homepage says free tools, courses and manipulatives. We saw no price.
Who runs it?
The legal page says it is part of Amplify Education, Inc.
What is Polypad?
Mathigon's manipulatives tool. The homepage says it moved to Amplify, and we did not read the details.
Sources: mathigon.org, About, Course Library, Policies. Checked 19 October 2026.
Independent guide, not affiliated.