One-time support
From R$5 any amount
A single contribution, of whatever amount makes sense to you.
Free for learners, kept running by supporters.
All of Math Mental's content is open and will stay that way. A voluntary contribution covers the cost of keeping the project online and helps fund the next units.
Monthly support
R$10 per month
A recurring contribution that makes the project predictable. Cancel whenever you want.
Where your contribution goes
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Servers and database
Keep the path, your streak and your history available.
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New units
From mental math to real analysis, with reviewed step-by-step solutions.
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No ads, no data sold
No ad space sold, no data shared and no lesson locked behind a payment.
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Optional extras
Refilling hearts and other extras help pay for servers and AI. None of them unlocks a lesson or any content advantage.