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EnglishWhat Is Mathplanet and Who Runs It?
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Mathplanet is a free online platform for high school math, run by the Swedish non-profit Mattecentrum. It offers full courses in Pre-Algebra, Algebra 1, Algebra 2, and Geometry, plus SAT and ACT prep — all described on the site as completely free, with the organization asking for donations to keep it that way.
What Mathplanet offers
The site organizes its material into course tracks rather than a single browse-everything library:
| Course | Focus |
|---|---|
| Pre-Algebra | Building the foundation |
| Algebra 1 | Equations and functions |
| Algebra 2 | Advanced algebra topics |
| Geometry | Shapes, proofs, and space |
| SAT prep | Practice tests and tips |
| ACT prep | Practice tests and tips |
Beyond the main courses, the homepage also points to Math Playground, programming in Python, and practice tests as additional tools.
Who runs it
Mathplanet is a free service from Mattecentrum, a non-profit organization founded in Sweden. The site states that over 300,000 people learned math there for free in a single year, and it asks visitors to donate (the page shows a $20 donation option) to help keep the service free.
Mattecentrum also runs related sites listed on the page: Matteboken, Matteboken (Arabic), and Webmatematik (Danish) — useful if you want the same style of material in Swedish, Arabic, or Danish.
What this means if you're deciding whether to use it
- Cost: The site presents itself as free, with no pricing signals or payment platforms listed. Donations are requested, not required.
- Level: High school math, from pre-algebra foundations through advanced algebra and geometry, plus standardized test prep.
- Language: The main Mathplanet site is in English; sister sites cover Swedish, Arabic, and Danish.
- Best fit: Self-study or supplementing a high school course, or preparing for the SAT/ACT without paying for a prep service.
If you want structured high school math courses at no cost and don't need credit or a teacher, Mathplanet is built for exactly that. If you need graded credentials or one-on-one instruction, this isn't that kind of platform.