Doomsday Trainer is an educational app developed by Inefficient Code.
Download Statistics
Doomsday Trainer has been downloaded 770 times. In the last 30 days, the app was downloaded 180 times.
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App Information
Doomsday Trainer is FREE to download. The APK download size is 13.32 MB. The latest version available is 6.1.0. The last update was on July 13, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play March 2026.
Description
Can you figure out that March 15, 1937 was a Monday — in under 5 seconds?
Doomsday Trainer — Name Any Day in Your Head teaches you the mental calendar calculation techniques used by competitive memory athletes and calendar savants. Start slow, build the skill, then race the clock.
🎮 THE GAME Every round, you're shown a random date from across the centuries. Your goal: name the correct day of the week as fast as possible.
• Build Your Streak: Answer correctly and your streak grows. Answer wrong and it's over. • Beat the Clock: A countdown timer keeps the pressure on, getting tighter the longer your streak runs.
Build the longest streak. Set the fastest average speed. Climb the global rankings.
🧠 FIVE METHODS TO MASTER Not everyone thinks the same way. Doomsday Trainer teaches five proven calculation techniques, each with its own step-by-step training mode:
• Doomsday: The classic anchor-date method used by world memory champions. • Wollin Shortcut: A two-part system using vectorized Doomsday codes and Doomyear sequences for lightning-fast results. • Odd + 11: An elegant carry-free approach with no multiplication. • Mod 28: Subtract chunks of 28, count leaps, done. • Conway: Dozens, remainder, and leaps in one smooth pass.
Training mode walks you through every calculation step-by-step, featuring progressive hints, a full reference Databank, and a built-in Wollin lookup table.
🎯 FOCUSED DRILLS Isolate the parts that slow you down. Eight targeted drill modes sharpen the individual skills that feed into every calculation:
• Month Anchors • Century Anchors • Year Offset • Modulo 7 • Add / Subtract • Times Tables • The Wollin Shortcut • Leap Year Detection
Track your progress across every drill category with detailed accuracy breakdowns and improvement charts.
⚔️ BATTLE REAL OPPONENTS Challenge players around the world in real-time 1v1 Best-of-5 matches.
• Fair Competition: Both players receive identical dates (same seed, same sequence), so the result is pure speed and accuracy. • Ghost Matchmaking: No live opponent online? The game instantly matches you with a ghost recording of a real player from your skill range. • Rank Up: Earn Elo rating and climb the competitive 1v1 leaderboard.
🌍 GLOBAL LEADERBOARDS Compete for the top of two global rankings. Your scores sync automatically so you can see exactly where you stand worldwide.
• Longest Streak: How many correct answers in a row can you get? • Fastest Speed: What's your best average over 5 consecutive answers?
📈 TRACK YOUR PROGRESS • Speed and accuracy charts for the past 7 days, 30 days, or full year. • Personal best streak and speed records. • Training and drill completion history. • Full game-by-game breakdown.
✨ FEATURES • Multiple visual themes to customize your experience. • Adjustable font size and layout options. • Full coverage of edge cases, including leap year handling and century shifts.
Whether you're a memory sports competitor, a maths enthusiast, or just someone who wants a genuinely unusual party trick — Doomsday Trainer will get you there.
Recent changes: New in v6.1.0: Various bug fixes and rebalanced ELO distribution
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Not only does this tool teach you a really cool party trick, it is also an exceptional tool for drilling down basic arithmetic with an intuitive flash card system. My nephew loves the times' table feature up to 20x20! A real hidden gem with a lot of value and a fun challenge.
★★★★★Alex Montes· Mar 30, 2026
Found on reddit the other day, a few days of light practice later, and I've got it down! 11 in a row is my best streak so far. Super cool math trick and very useful app to practice with. All the updates have been welcome 👍🏼
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