Build Directory
MathPal
An AI math solver students add to Chrome, free to try, then priced two ways.
Your personal AI math solver. Highlight a problem, get the steps. The first solve is free, which is the whole hook.
- Format
- AI math-solver Chrome extension, plus web and iOS
- Pricing
- 1 free solve, Pro $9.99/mo, Premium $189 one-time
- Reported MRR
- About $100, by the founder's bio
- For
- Students, primary school to university
Who it’s for
Students from primary school to university who want step-by-step help on math homework without leaving the page.
Where the money comes from
MathPal is a Chrome extension that solves math problems. A student highlights any problem on the screen and gets step-by-step working in a side panel, across school and university level math. The first solve is free with no account, then it charges: $9.99 a month for Pro, with a weekly usage cap it calls energy, or $189 once for lifetime access. By the founder's bio it is his best earner so far, around $100 in monthly recurring revenue.
How it makes money
It is a textbook freemium loop, and it is built well. The first taste is completely frictionless, one solve, no signup, which is exactly how you prove value before asking for anything. Then the weekly energy cap does the selling: a student who only needs one answer stays free and tells their friends, and a student who leans on it every week hits the wall and upgrades. The two-price structure quietly solves the other problem every AI product has, that each solve costs the founder an API call. The monthly plan means he carries that cost and bets on retention. The $189 lifetime price means a heavy user prepays enough to cover their own usage for a long time.
The honest catch is the market and the competition. It is students, who are price-sensitive and churn hard at the end of a term, and the space is crowded with solvers and with free general chatbots that do the same thing. The mechanics are sound and the conversion path is clean. The ceiling depends on whether "highlight and solve in one click" stays worth paying for when a free chatbot is one tab away. See the rest of what its builder is shipping.
What a builder can learn
This is a clean freemium loop: remove all friction on the first taste (one solve, no signup), then cap usage so a regular user has to pay. The two-tier pricing also answers the AI cost problem, a monthly plan where the founder eats the API bill, or a one-time price where the heavy user effectively prepays for it. For a solo dev, converting free users this way is the whole game.
Read: How to Turn Free Users Into Paying CustomersIs this your product?
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