WeekdayWiz

WeekdayWiz turns a party trick into a real skill. Want to know what day of the week your birthday falls on in 2034? Or whether 14 July 1789 was a Tuesday? Most people reach for a calendar app. With WeekdayWiz, you train your brain to do it in your head — in under 3 seconds. The method is a 9-step mental calculation tuned for dates between 1900 and 2099. Sounds intimidating? It isn't. You can master it in about a week of focused practice. — BUILT FOR LEARNING — • A guided Wizard walks you through every step on a real date, with explainers tuned to absolute beginners. • Practice mode reveals each step on tap, so you can hint your way through until the algorithm sticks. • Speedrun modes drill one skill at a time — month codes, mod 7 arithmetic, leap-year corrections — under a timer that pushes you faster. — TRACK YOUR MASTERY — • 12 distinct training modes from "Day of month mod 7" all the way to the Full Algorithm. • Master a mode by hitting 25 correct in a row, under the goal time (typically 3–6 seconds per answer). Progress shows as mastery badges on the home screen. • Personal bests, run history, achievement grid for all 12 modes. — REAL-TIME PACING FEEDBACK — A per-question alarm fires the moment you cross your time budget — so you feel yourself slipping before the answer is even given. — DESIGNED FOR DAILY PRACTICE — • Pull-to-refresh: a fresh random date. • Date picker for testing specific days (your birthday, a historical event, a future plan). • Light and dark themes, system-aware. • iCloud sync keeps your records consistent across iPhones (Pro). — FREE & PRO — The wizard, all step explainers, every method walkthrough, and practice mode stay free forever. Pro unlocks the timed training modes, the mastery system, and iCloud sync — one-time purchase, yours forever. 7-day free trial included. Master the calendar. Without the calendar.