PolyPod vs Doomsday Trainer

Build your language-learning habit with podcasts you enjoy. PolyPod combines a podcast player with automatic listening-time tracking. Find something you want to hear, press play, and see your listening hours add up. SEE YOUR CONSISTENCY GROW - Set a daily goal and follow your listening time, streaks, and progress. MAKE LISTENING WORK FOR YOU - Adjust playback speed, bookmark moments to revisit, and generate on-device transcripts to read alongside the audio. FIND YOUR NEXT LISTEN - Discover podcasts in your target language and keep your favourites together. - Practising with comprehensible input? Keep your podcast listening and your input tracking in one place. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://polypod.app/privacy-policy/

Master the Doomsday Algorithm — calculate the day of the week for any date in history in seconds. PLAY Build your streak and beat the clock. Every correct answer adds to your streak; one wrong answer ends it. Compete on the global leaderboard for Longest Streak and Fastest Average Speed. BATTLE Challenge a real opponent to a live 1-on-1 race. Five dates, fastest and most accurate player wins. Elo-based ranking tracks your competitive record. TRAIN Six methods to choose from: • Doomsday — the classic anchor-day approach • Odd + 11 — the Fong-Walters mental shortcut • The Wollin Shortcut — a memory-based system using vectorized doomsdays, the Square Knot Rule, and the Wollin Calamity Table (by u/Nillows) • Conway's Method — the original algorithm by John Conway • Mod 28 — reduce any year to under 28 before calculating • Custom Mode — pick your own date range, century, or decade DRILL Targeted practice for each component: months, centuries, years, mod 7 arithmetic, and the full Wollin Shortcut drill suite. TUTORIAL New to the algorithm? The built-in tutorial walks you through everything step by step.