BizMath vs lemma

BizMath trains the mental math skills that consulting and finance interviewers actually test. Most math apps drill times tables. BizMath generates over 19 million unique questions, from fast arithmetic scaled to business numbers to full word problems covering revenue & profit calculations, break-even analysis, percentage change, and market sizing. The exact math you'll do on the job and in the interview. QUICK CALCS Fast-paced arithmetic across six operations: multiplication, division, addition, subtraction, percentages, and exponents. Four difficulty levels from Easy to Expert, with numbers scaled to what you'll actually encounter in business contexts. Not textbook problems. WORD PROBLEMS 300 original business scenario templates across four categories: Revenue & Profit, Percentage Change, Break-Even, and Market Sizing. Every scenario uses realistic company contexts and interview-appropriate numbers. BUILT FOR INTERVIEW CONDITIONS • Estimation Mode: Practice the approximation skills interviewers actually reward. Set your tolerance and train yourself to get close fast rather than exact slow. • Timed Practice: Add time pressure to simulate real interview conditions. • Expert Difficulty: Large numbers, multi-step calculations, and trailing zeros. The problems that separate prepared candidates from everyone else. TRACK YOUR PROGRESS Detailed performance tracking across every operation, category, and difficulty level. See where you're strong and where you need work. LEARN Built-in reference guides covering mental math shortcuts, word problem formulas, and the business concepts behind every question type. FREE BizMath is completely free. No daily limits, no subscription, no ads. Designed for iPhone. Built by a consulting hire who needed this app during prep and couldn't find it. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.999techventures.com/privacy

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/