App Intel

Doomsday Trainer Live

Inefficient Code6 apps · 50.3K installsEducationalFreecom.inefficientcode.doomsdaytrainer

Calculate the day of the week for any date in history. Train your brain!

Total installs
1,040
exact · Play shows 1,000+
Installs / day
—
measured after our second crawl (about a day)
Rating
—★
— ratings · — reviews
Released
13 Mar 2026
7mo ago
Last update
13 Sept 2026
v6.1.5 · 28d ago
Countries
—
not checked yet

Install history

exact counter from Google Play
1K1.3K1.5K1.8K2K10 Oct11 Oct11 Oct

Installs per day · last 30 days

Not enough history yet — check back tomorrow

Change timeline

No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.

Country availability

Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.

Top countries

Country data will be available soon.

We estimate where downloads come from using the app’s position in Google Play’s top charts in about 140 countries. This app is not in any chart we have collected yet; the estimate appears as soon as it is.

Top chart positions

Not in any tracked top chart.

Permissions

4 in 1 group
0 Sensitive1 Notable3 Routine
OtherNotable4

Access to miscellaneous device features that don't fit other categories

  • Keep your phone's processor or screen from going to sleep, which can use more batteryprevent device from sleeping · WAKE_LOCK
  • Check whether you are online and whether you use Wi-Fi or mobile dataview network connections · ACCESS_NETWORK_STATE
  • Connect to the internet to load content and send datafull network access · INTERNET
  • Check with Google Play that you got this app legitimatelyGoogle Play license check · com.android.vending.CHECK_LICENSE

Sensitive = can reach personal data, location, camera/mic or act on your behalf. Notable = changes how your device behaves. Routine = normal for almost every app. Source: Google Play's permission list for all versions of this app.

Store listing

Full 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.

What's new

New in v6.1.5: Integrated explanation engine

Growing in Educational

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