lemma vs Tradoing

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/

Tradoing: Quant Cards turns dense finance and algorithmic-trading concepts into fast, active-recall flashcards. Instead of passively flipping cards, you actually do the work — spot the bug in a strategy, pick the right tool for a scenario, judge whether a number is plausible, rebuild a formula, put the steps of a process in order, and connect related ideas. Topics span the quant curriculum: • Company fundamentals, ratios and valuation • Macroeconomics and market regimes • Commodities and futures • Technical indicators for backtesting • Options and the greeks • Derivatives beyond vanilla • Crypto and market microstructure • Quantitative finance, risk and backtesting Features: • 360+ hand-written cards across six active-learning mechanics • Spaced repetition — each card comes back right before you'd forget it • Fully offline — study anywhere, no connection required • A searchable reference library of the underlying concepts • Optional sign-in to sync your progress across devices • A daily study reminder to keep your streak going Built for anyone preparing for quant and trading interviews, learning systematic trading, or keeping their markets knowledge sharp.