Repeatedly vs Millennium Problems

Master Any Subject with Science-Backed Spaced Repetition Repeatedly transforms how you learn and retain knowledge. Create flashcards with your favorite AI tools, then import the markdown files for scientifically-optimized spaced repetition learning. Beyond Simple Flashcards * Rich context cards with examples, explanations, and detailed information * See the full picture after your initial recall attempt * Build interconnected knowledge, not isolated facts * Perfect for complex subjects like programming, sciences, and professional development Simple AI-Powered Workflow * Create flashcards with ChatGPT, Claude, Gemini, or any AI tool * Ask AI to generate markdown flashcard files from articles, books, notes * Import the markdown files directly into Repeatedly * Start studying with proven spaced repetition immediately * Note: Requires your own AI subscriptions - no AI included Your Data, Your Control * Standard markdown format - no vendor lock-in * Edit cards in any text editor (VS Code, Obsidian, Notes) * Future-proof your learning investment * Version control with Git, process with scripts * Readable decades from now, long after apps disappear Intelligent Features * Scientifically-proven Leitner system spacing (1, 2, 4, 7, 15 day intervals) * iCloud sync across all your devices * Organize with nested decks for any subject * Import text and markdown files with frontmatter Perfect For: * Students mastering complex subjects * Developers learning new technologies * Professionals staying current in their field * Anyone building a personal knowledge base Create cards with AI, study with science. Own your knowledge forever.

Can you solve a problem worth $1,000,000? The Clay Mathematics Institute has offered a million-dollar prize for each of seven unsolved mathematical problems — and nobody has claimed them yet. Millennium Problems brings these mysteries to life for everyone, from curious 11-year-olds to doctoral researchers. SEVEN LEGENDARY PROBLEMS • P vs NP — Is finding as hard as checking? • Riemann Hypothesis — Where do prime numbers hide? • Yang-Mills & Mass Gap — Why do particles have mass? • Navier-Stokes — Can we predict turbulent fluids? • Hodge Conjecture — What shapes are built from algebra? • Birch & Swinnerton-Dyer — How many solutions does an equation have? • Poincaré Conjecture — The shape of the universe (SOLVED!) EVERY SKILL LEVEL Choose your grade — from Grade 6 to Graduate — and the content adapts instantly. The same problem is explained with simple analogies for a middle schooler and rigorous proofs for a PhD student. INTERACTIVE 3D VISUALISATIONS Every problem comes with a real-time Three.js visualisation. Watch elliptic curves rotate, Riemann zeros appear on the critical line, and fluid particle fields swirl — all rendered natively on your device. BUILT-IN QUIZZES Test your understanding with 5 questions per problem per grade level. Earn XP, track your streak, and collect badges as you explore. WORKS OFFLINE No account. No subscription. No ads. Everything runs locally on your device. OPTIONAL BIOMETRIC LOCK Protect your progress with Face ID, Touch ID, or fingerprint — entirely optional. Whether you're a student looking for a challenge, a teacher seeking engaging material, or a mathematician revisiting the classics, Millennium Problems meets you where you are. Clay Mathematics Institute · $7,000,000 in unclaimed prizes · Since 2000