OtterDay: Weekday Guesser

Learn the Date Trick!

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

LEARN THE DATE TRICK! Ever wondered what day of the week a date fell on? With Otter Day, you’ll learn to calculate it in your head—fast. Example: July 4, 1776 — the day of American Independence? *thinking 5 seconds* Thursday! Master this mental superpower while playing the brainy puzzle adventure with your otter crew. This method is similar to John Conway’s famous Doomsday Algorithm / method —but faster. WHAT IS OTTER DAY? It’s where brain training meets adventure. Imagine Sudoku’s challenge fused with the addictive streak of a language app—wrapped in neon lights and guided by otters from the future. Your mission: unlock the “date trick,” train with puzzles, and amaze yourself (and your friends) by naming the right day for any date in history—or the future—in under 5 seconds. KEY FEATURES - Interactive Otter Guides – Learn the “date trick” step by step - Two Game Modes – Practice with written dates or spoken challenges. - Achievements – Collect rewards for speed, endurance, and precision. - Progress Tracking – See your streaks, times, and brainpower grow - Timeless Challenge – Works for any dates from 1750: Past or far future WHO WILL LOVE IT? - Puzzle fans looking for a new twist - Math and logic lovers - Players that like Sudoku, Nonogram or 2048 like games - Anyone who ever asked: “What day was July 4, 1776?” - Learners who want fun, fast brain growth WHY PLAY? Because learning this trick feels like unlocking a superpower. Outsmart your friends, impress your teachers, and challenge yourself to guess the right day in under five seconds—all while your otter squad cheers you on. Otter Day — Master the calendar. Flex your brain. Outsmart everybody.

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

Just a few tweaks to make your experience better!

Version 1.1.1

The developer, FELIX MANUEL PLAGGE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Usage Data

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • FELIX MANUEL PLAGGE
Size
  • 138.7 MB
Category
  • Puzzle
Compatibility
Requires iOS 15.6 or later.
  • iPhone
    Requires iOS 15.6 or later.
  • iPod touch
    Requires iOS 15.6 or later.
  • Mac
    Requires macOS 12.5 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © Felix Plagge Digital Labs
  • Developer Website
  • Privacy Policy

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