Built by a student,
for every student
Lemma started with a frustration: solving hundreds of problems with no way to know if the reasoning was correct. So we built the feedback loop that should have existed all along.
The origin story
When you are studying for a competitive exam like JEE Advanced or the AMC, the biggest challenge is not finding problems. It is getting meaningful feedback on your approach.
What if there was a system that generated problems at exactly your level, watched you solve them, and told you precisely where your logic diverged from the correct path?
That is what Lemma does. A 3-layer verification system that checks your work deterministically, symbolically, and with AI reasoning analysis.
What we believe
Obsessive care
Every problem, every feedback message is crafted with the student in mind.
Honest feedback
We never sugarcoat. If your reasoning is wrong, we tell you exactly why.
Learning over answers
We build understanding. The answer matters less than how you got there.
Accessible to all
A generous free tier ensures preparation quality is not locked behind wealth.
Want to help shape the future of learning?
We are always looking for passionate people who believe math education can be fundamentally better.
Get in touchYour exam date is not waiting.
Neither should your preparation.
Start with 5 free problems today. No credit card. No commitment.