Making student thinking visible in math.
Traditional tools just generate answers. Lemma is a voice AI math tutor that listens to students' reasoning while they solve and gives real-time feedback.
The Problem
Across the world, students struggle with math, and the gap compounds over time.
44%
of children globally achieve minimum proficiency in mathematics by the end of primary school.
15-point drop
in OECD-average math performance in PISA 2022 compared with 2018.
1:1 tutoring works
but it is too expensive and scarce to reach every student.
Sources: UNESCO Institute for Statistics, OECD PISA 2022, NBER tutoring meta-analysis, Education Endowment Foundation.
Root Cause
Most classrooms, worksheets, and software only capture the result. They rarely capture the explanation or work that reveals what a student actually understands.
That is why students often get feedback too late. Good tutors work differently. They respond during the process, not after it.
The Solution
Lemma is a voice AI tutor built specifically for math. It listens to students, follows the work on a shared canvas, and responds in real time.
Our goal is to get as close as we can to a strong human tutor by listening, watching, and guiding while the student is still solving.
Demo
Watch Lemma follow a student's work, listen to their reasoning, and respond while they solve.
Waitlist
Tell us who you are and how you would use Lemma. We are inviting early users by hand.