lemma vs Quantrack

Train like a quant. Daily. Lemma is the focused, no-fluff prep app for quantitative interviews — built for students and grads targeting Jane Street, Citadel, Optiver, Two Sigma, and the rest of the trading-firm gauntlet. WHAT'S INSIDE WITH YOUR SUBSCRIPTION • Daily sprints — bite-sized timed sets of mental math, probability, combinatorics, expected value, and market-making problems • Per-category ELO — your skill is tracked across 10 disciplines, from Novice to Expert • Adaptive difficulty — problems chosen to keep you at the edge of your level, not above or below • Hints + step-through solutions — get unstuck without giving up • Streaks, XP, leagues — habit loops without the noise • Achievements — unlock as you grind • Leaderboard — see how you stack up WHO IT'S FOR • CS / math undergrads applying to trading firms • Recent grads prepping for technical interviews • Self-learners who want a daily quantitative-thinking habit • Anyone curious about how trading interviews actually feel WHY LEMMA We strip out the gamified clutter and keep what matters: hard problems, fast iteration, real numbers on your progress. The interface borrows more from a Bloomberg terminal than a typical mobile game — monospaced metrics, hairline borders, dark by default. Most prep books drown you in 800 pages. Most courses lock you in for months. Lemma is 10 minutes a day, sharpened every day. — Lemma offers an optional auto-renewable subscription for unlimited daily sprints and premium problem sets. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://rogeru13.github.io/lemma-legal/privacy-policy/

Quantrack is a mental-math drill app for anyone preparing for quant and prop-trading interviews. Every session is a sprint: a big prompt, a custom number pad, and the clock running. Fast, focused, no fluff. TRAIN THE MATH INTERVIEWS TEST Work through eight core modes, free: • Addition • Subtraction • Multiplication • Division • Fractions • Percentages • Decimals • Mixed BUILT FOR SPEED • A custom number pad designed for rapid entry, with no default keyboard • Instant feedback and haptics on every answer • Accuracy and speed tracked for every session BUILD THE HABIT • Daily streaks that reward showing up • Personal stats and progress by mode GO FURTHER WITH QUANTRACK PRO • Endless questions in every mode, with no 100-question cap • Seven quant interview modes: Probability, Expected Value, Log / Exp, Bid–Ask, Options Intuition, Bayesian, and Sequence Patterns https://www.apple.com/legal/internet-services/itunes/dev/stdeula/