Math lessons your kid actually finishes.
A verified SAT & high-school math library — every step checked against a solver, nothing made up. Watch the lesson, work the steps, master the skill.
The whole library is free to watch. Bring your own problem on a paid plan.
Solving 3x + 7 = 25 with the rideshare metaphor
How it works
- 1
Browse the verified curriculum.
SAT and high-school math, organized by skill. Every lesson's steps are re-checked against a symbolic solver before it ships — nothing made up.
- 2
Watch, then work the steps.
Watch the lesson, then practice: put the solution in order, pick the answer — graded against the verified solution, not an AI guess.
- 3
Master the skill.
Get them right and the skill turns “mastered,” your progress climbing across the curriculum. Stuck on your own problem? Make a verified lesson just for it.
Your voice. Their lesson.
Record 20 seconds. Every lesson from then on comes back in your voice. Your kid gets you, explaining math, when you can't be there at the kitchen table.
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Why I built this
Hi — I'm [name], a math teacher in [city]. I built INFINITE SUM after one too many evenings watching parents try to help their kid with a problem they hadn't seen since 1998.
You type the problem. We render a 3-minute lesson in your voice. That's the tool.
Right now: coordinate geometry — slope, midpoint, distance, lines — plus the Pythagorean theorem and similar triangles. Algebra 1 is next. I care more about each lesson being right than about the topic list being long.
Pricing
First lesson is free. Pick the tier that fits.
Pay as you go
- First lesson free
- Stock voice library
- 16:9 / 9:16 / 1:1 download
- No subscription, no expiry
Family
- 10 lessons per month
- Voice clone included
- Re-render any aspect in 60 sec
- Cancel anytime