OtterDay: Calendar Logic Game
Name Any Weekday in 5 Seconds
About
Learn to quickly calculate the day of the week for any date using a mental superpower. Engage in a puzzle adventure with otter guides, mastering the "date trick" through interactive challenges and tracking your progress.
What's New in OtterDay
1.2.0
July 16, 2026
The statistics page just landed, along with a sleek new design!
In-App Purchases
$6.99
Pro
Pro
FAQ
What is OtterDay?
OtterDay is a game that teaches you to calculate the day of the week for any date mentally. It combines brain training with a puzzle adventure featuring otter guides.
How does OtterDay teach the date trick?
OtterDay uses interactive otter guides to teach the 'date trick' step-by-step. You can practice with written dates or spoken challenges in two distinct game modes.
Can OtterDay calculate days for past and future dates?
Yes, OtterDay offers a timeless challenge that works for any dates from 1750, covering both past historical dates and dates far into the future.
What kind of progress tracking does OtterDay offer?
OtterDay provides progress tracking so you can see your streaks, best times, and overall brainpower growth. You can also collect rewards for speed, endurance, and precision through achievements.
What is the age rating for OtterDay?
OtterDay has an age rating of 4+, making it suitable for a wide range of users interested in learning and brain training.
Does OtterDay have ads?
Yes, OtterDay contains advertisements. It is a free app with in-app purchases available.
What devices does OtterDay support?
OtterDay is currently supported on iPhone and iPod devices, allowing users on these platforms to learn the date trick.
How often is OtterDay updated?
OtterDay was last updated on June 19, 2026, with version 1.1.7. This indicates a commitment to ongoing development and improvements.
