OTTER DAYGet the app
EN
SHIPATON 2025 WINNER1st place · Best VibesThe story
AI recreation of the Otter Day billboard at One Times Square, with the New Year’s ball and clock above
Times Square, reimagined with AI from the developer’s original photograph.
A LITTLE GAME. A BIG MOMENT.

From a date trick
to Times Square.

Otter Day took first place in the Best Vibes category at RevenueCat’s Shipaton 2025, celebrating creative use of AI tools.

The official winners, on RevenueCat ↗The developer’s thoughts on the win ↗

A LOGIC GAME FOR CURIOUS MINDS

Be the
Human
Calendar.

Turn any date into its weekday.
Learn to work it out in your head.

Free to download · iPhone & Android · In-app purchases

Try your first date right here
Otter Day gameplay: a date challenge above a seven-day answer wheel
ONE DATE. SEVEN POSSIBILITIES.
TRY A DATE

Every date
has its day.

Pick a weekday. Liv can help.

WHICH WEEKDAY?01 / 06

Which weekday is

July 20, 1969

Need a hint?
Choose a weekday

Pick a weekday. Ask Liv if you need help.

LEARN. PLAY. KEEP GOING.

A little every day.
A skill that stays.

A skill you can learn. A game you want to play.

The real tutorial menu: a scrollable learning path with Basics, Advanced and Exam, plus standalone exercises
Guided tutorialsMeet the method.
01 / GUIDED TUTORIALS

Meet the method.

Follow your otter guides through the calendar trick. Small steps, clear examples, and practice that clicks.

Explore the method
Six levelsYOUR TIME WINDOW GROWS
02 / SIX LEVELS

Make it second nature.

Play through ever-wider date ranges. Start with this year; reach from 1700 to 2099 in Level 6.

Speed AcademySmall shortcuts. Quicker thinking.
03 / SPEED ACADEMY

Put it all together.

Build better shortcuts in Speed Academy. With practice, work toward a weekday in five seconds.

The glowing otter crystal at the heart of your daily streak
Daily streaksONE DAY AT A TIME
04 / DAILY STREAKS

Keep your spark alive.

A little practice goes a long way. Return each day and keep your otter crystal glowing.

OTTER IQYOUR PROGRESS, MADE VISIBLE
05 / OTTER IQ

See how far you’ve come.

Your in-game progress score, built as you learn and play. A record of your calendar skills — not a real-world IQ test.

Home widgetsYour otter. Always with you.
06 / HOME WIDGETS

Your otter. Always with you.

Keep a little Otter Day on your home screen. Your streak and your companion, one glance away.

App screenshots show the upcoming English version. Feature artwork illustrates the experience.

THE PLAYER PERSPECTIVE

A little curiosity.
A new daily ritual.

REVIEW / 01★★★★★
“A tiny daily puzzle with a very satisfying light-bulb moment.”
Alex · player
REVIEW / 02★★★★★
“I came for the otters. I stayed for the calendar trick.”
Sam · player
REVIEW / 03★★★★★
“The kind of skill you immediately want to try on your friends.”
Robin · player

NO MAGIC. A METHOD.

You can learn
to think like this.

Three small codes. One weekday.
See how the calendar trick works.

Read the guide Questions? Start here →
An otter tutor studies a seven-node ring representing the days of the week
FOR IPHONE & ANDROID

Your next daily challenge.

Learn the method. Play with dates.

Download on theApp StoreGet it onGoogle Play

Free to download · In-app purchases