WTH: What's This Holiday app icon

From Hamdouchi Interactive

WTH: What's This Holiday

A coworker says "Happy Diwali" and you nod. WTH explains the holidays of the world's faiths, nations and cultures, at the depth you pick, with today's holidays waiting as a daily lesson.

Free on the App Store for iPhone, iPad and Apple Watch. Today's holidays and 40 more are free. Works offline, with no ads and no account.

WTH: What's This Holiday on iPhone: Diwali on November 8, 2026

Pick your depth

Explain it like I am seven. Or not.

Every holiday comes at three depths. Quick Take is short and simple enough to read to a child. Full Story covers who, where, when and why. Deep Dive goes into the history, the meaning, the foods, the music and the ways it differs from place to place.

Pick a default once and switch any page with one tap. Every text is written in original words from at least two cited sources, listed at the bottom of the page.

Diwali at Deep Dive depth in WTH: What's This Holiday on iPhone

The right words

Say it like you mean it.

When a holiday has a traditional greeting, WTH shows it in its own script with a romanization, a plain way to say it, what it means and when it fits. One tap copies it, ready for a message.

शुभ दीपावली Shubh Deepavali Say it: SHOOBH dee-PAH-vuh-lee. It means "auspicious Diwali".

Holidays without a real greeting get none. Remembrance days, for one, have no festive greeting, and WTH never makes one up.

The Diwali greeting Shubh Deepavali in WTH: What's This Holiday on iPhone

Your people

Never miss a "Happy Diwali" again.

Tag the people in your life on the holidays they celebrate, with a reminder. Every year, on the day, WTH nudges you: "Diwali is today. Wish Priya a happy Diwali: Shubh Deepavali!"

People you tag stay on your devices. WTH collects no data.

The People tab in WTH: What's This Holiday on iPhone

Calendar

Today is a holiday. Probably.

The Calendar opens on today with its holidays on top, so a two-minute lesson is always waiting. Each day of the month shows how many holidays it holds, and dates run from 2025 through 2036.

  • Religious
  • National
  • Cultural
  • Awareness
November 2026 in the Calendar of WTH: What's This Holiday on iPhone

Widgets

Today's holiday, one glance away.

The Today's Holiday widget puts the day's holidays on your Home Screen, and the Lock Screen keeps the name right under the clock. Tap it to read the lesson.

The medium Today's Holiday widget with Diwali The small Today's Holiday widget

Apple Watch

A holiday on your wrist.

See today and the next six days, read the Quick Take, and find the greeting before you say it. A complication keeps today's holiday on your watch face.

WTH on Apple Watch: today's holidays

iPad

Room for the Deep Dive.

On iPad the day's holidays and the page sit side by side, with the text at a width that is easy to read. Good for the classroom, the couch and the "wait, why do we do this?" moment.

WTH: What's This Holiday on iPad

All Holidays

Every holiday, any day.

Every holiday that falls on today is free at every depth, and so are 40 well-known holidays. All Holidays opens the rest, on any day of the year, and every holiday added in future updates.

One payment of $4.99. No subscription.

Family Sharing included, and Restore Purchases brings it back on a new device. No ads, no timers, no nagging.

The Unlock All Holidays card on iPhone

iPhone Duo

Fold it. Learn something.

WTH is ready for iPhone Duo: today's holiday on the outer display, and the full Calendar when you open it up.

Free on the App Store for iPhone, iPad and Apple Watch. All Holidays is $4.99 once.

WTH on the iPhone Duo outer display: today's holiday