Doomsday Practice vs IQClimb

Doomsday Practice helps you master the Doomsday algorithm: a mental math technique for calculating the day of the week for any date in your head. LEARN Step-by-step lessons break the algorithm into digestible pieces. Understand the anchor days, memorize the Doomsday dates, and build a reliable mental framework at your own pace. PRACTICE Drill random dates across any year or century. Get instant feedback, track your accuracy, and build speed through repetition. REVIEW A clean reference sheet keeps the key rules and mnemonics at your fingertips while you're still building fluency. TRACK YOUR PROGRESS Streaks and stats keep you accountable. Watch your accuracy and response time improve over time. Whether you're a mental math enthusiast, a memory competitor, or just want a party trick that actually impresses people: Doomsday Practice gets you there.

Discover how your mind works and build stronger cognitive skills with IQClimb. Take an adaptive baseline, review your reasoning, memory, speed, problem-solving, and visual-processing profile, then train across nine distinct cognitive worlds. Every training path contains authored, named stages—not a generic numbered map. Live drills adapt across logic, memory, pattern recognition, reaction speed, mental math, spatial reasoning, verbal skill, attention, and problem solving. Every drill is unlimited: practise any category as often as you like. A failed stage has a clear result, retry, and exit flow. You get one free official assessment every week. IQClimb Premium unlocks unlimited official IQ assessments, a full progress history with your IQ and category trends over time, and removes all ads. Track accuracy, lessons, achievements, personal bests, and leaderboard progress. No account is required to begin. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/