lemma: Comp Math Trainer
AMC, AIME, IMO, Putnam
About
This app provides focused, daily practice for quantitative interviews, featuring timed sprints of math and probability problems. It tracks your skill across disciplines with adaptive difficulty and offers hints and solutions to help you improve. Designed for those preparing for trading firm interviews or seeking to build a quantitative thinking habit.
What's New in lemma
1.0.1
June 3, 2026
- fixed problem sequences in workout - adjusted problem solution UI to be more understandable
Subscription plans
Lemma Premium
Unlimited workouts, all problems, and progress.
Developer apps
FAQ
What kind of math problems does lemma focus on?
lemma focuses on mental math, probability, combinatorics, expected value, and market-making problems, specifically tailored for quantitative interviews.
How does lemma track my progress?
lemma uses a per-category ELO system to track your skill across 10 disciplines, ranging from Novice to Expert, and features adaptive difficulty to keep you challenged.
Is lemma suitable for beginners?
Yes, lemma is designed for a range of users, including CS/math undergrads and recent grads. It offers hints and step-through solutions to help users get unstuck.
What is the subscription model for lemma?
lemma offers an optional auto-renewable subscription for unlimited daily sprints and premium problem sets, with weekly, monthly, and yearly options. A 3-day free trial is available for the yearly plan.
Can I cancel my lemma subscription?
Yes, subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your Apple ID settings.
What devices does lemma support?
lemma is available on iPhone, iPod, and iPad, and is rated for ages 12 and up.
How often is lemma updated?
The latest version of lemma is 1.0.1, and it was last updated on June 3, 2026. This indicates a recent and active development cycle.
Does lemma have ads?
No, lemma does not contain advertisements. The app is designed with a focused, no-fluff interface, prioritizing the learning experience.
