Doomsday Trainer vs Color Blind Test App

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.

COLOR VISION TEST Take a modern, interactive version of the Ishihara test designed for clarity and usability. • 16 procedurally generated Ishihara-style plates • Smooth difficulty progression from warm-up to advanced • No time pressure — complete the test at your own pace • Intuitive swipe-based navigation between plates • Clear warning before more difficult sections Get meaningful, easy-to-understand results: • Animated results screen with score and accuracy breakdown • Classification: Normal Vision / Mild Deficiency / Possible Deficiency • Detailed report with plate-by-plate review • Compare your answer with the correct result • Side-by-side “Your View” vs “Revealed” comparison • Share your results بسهولة EYE TRAINER GAME Train your visual sensitivity with a fast-paced color challenge. • Find the odd-colored tile in a grid • Grid sizes increase from 2×2 up to 7×7 • Difficulty scales exponentially as color differences shrink • Sudden death gameplay — one mistake ends the run • Instant feedback with visual highlights • Animated game over screen with score summary ISHIHARA CHALLENGE Push your limits in a high-stakes test mode. • Endless Ishihara plates with increasing difficulty • Sudden death mechanics • Immediate reveal of correct answer on mistakes • Performance-based challenge scoring LEADERBOARDS (GAME CENTER) • Compete globally in Eye Trainer and Ishihara Challenge • Scores automatically submitted • Access leaderboards anytime FEATURES • Clean, modern interface with smooth animations • Onboarding with interactive demos • Test history and performance tracking • Optimized for both iPhone and iPad • Haptic feedback for enhanced interaction • Full accessibility support • No account required — your data stays on your device IMPORTANT This app is designed for informational and training purposes only and is not a substitute for professional medical diagnosis.