CODEX: Mental Models & Biases

CODEX turns the big ideas of psychology, strategy and philosophy into a journey you can actually use. Read a short card. Answer three questions. Take the idea into your day with a field mission. That is the whole loop, and it is built so the ideas stick. WHAT YOU LEARN • Mental models: Charlie Munger's latticework, inversion, the 80/20 principle, second-order thinking • Cognitive biases: Kahneman's System 1 and System 2, anchoring, loss aversion, the planning fallacy • Stoicism: Marcus Aurelius, Epictetus and the dichotomy of control • Persuasion and influence: Cialdini's principles, Carnegie, how choice architecture nudges you • Strategy and power: Sun Tzu, Machiavelli, Boyd's OODA loop, 48 Laws of Power, Schopenhauer's debate tricks • Money and decisions: The Psychology of Money, Buffett's letters, Taleb's Black Swan and antifragility • Meaning and the mind: Frankl, Hofstadter, and patterns in yourself you have no words for 21 DECKS, 140 CARDS Each card is one idea: the theory, a quote, real examples from work, life and history, the common pitfall, and a prompt to apply it. A card takes about four minutes. A JOURNEY MAP, NOT A READING LIST Every deck is a world on a winding map. Every card is a step. Read it, earn up to three stars in a quick quiz, complete the field mission, and the next step opens. Each world ends with a boss quiz. QUIZZES THAT HELP YOU REMEMBER • 700 questions written from the cards, each with an explanation • Spaced review brings back the ideas you are about to forget • Combos, stars and XP to keep it fun COMPETE IF YOU WANT TO • Daily Challenge: the same 10 questions for everyone, every day • Weekly leagues from Bronze to Diamond. Finish near the top to move up • Scores are checked on the server, so the board stays fair DON'T JUST READ IT. USE IT. Field missions give you one concrete thing to try today. Come back, tell CODEX how it went, and the card is marked applied. Save private reflections to come back to. MADE FOR YOU A five-question start builds a path for the way you think: The Strategist, The Negotiator, The Operator, The Reader and more. FREE AND PRO • Free: five full decks (Sun Tzu, Taleb, Greene, Cipolla, Patterns in Yourself), the first card of every other deck, the Daily Challenge and leagues • CODEX PRO unlocks all 21 decks and unlimited reflections. The yearly plan starts with a 7-day free trial for new subscribers. A weekly plan is also available. Cancel anytime in Google Play WORKS OFFLINE, ACCOUNT OPTIONAL Read, quiz and review without a connection. Play as a guest, or sign in to sync your progress across devices and keep your subscription when you switch phones. Questions or ideas: [email protected]

The journey is now a map. Read a card, earn up to 3 stars in a quick quiz, then try it in real life with a field mission. New: Daily Challenge, weekly leagues from Bronze to Diamond, spaced review, and optional sign-in to sync progress and keep PRO across devices.