# Didu: Did You Know — A surprising fact every day

> A surprising fact every day (iPhone/iPad app by Didu Labs ApS.)

- Source: https://appshunter.io/ios/app/didu-did-you-know/id6749845814 (this page in markdown: same URL + `.md`)
- Developer: [Didu Labs ApS](https://appshunter.io/developer/1832429666)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 62 MB
- Languages: English
- Released: 2026-08-19
- Data updated: 2026-09-24
- User reviews in markdown: https://appshunter.io/ios/app/didu-did-you-know/id6749845814/reviews.md

## What is Didu?

One true thing about the world, every morning.

Didu sends you one fascinating, carefully researched drop each day. Two minutes to read, and nothing else waiting when you finish.

You don't choose the subject. That's the point. The best thing you learn this week will be something you would never have looked for.

Seven themes, one for each day of the week: psychology, science, history, economy, nature, art, and the universe.

Every drop is checked against two credible sources before it goes out. Not random quotes or empty hacks. If it isn't true, you won't find it in Didu.

Save the ones you love. A short quiz twice a week brings them back, so what you read becomes what you know.

No feed. No ads. No tracking. Nothing built to keep you scrolling.

Didu isn't built to impress you on day one. It's built to change you by day thirty.

Free to try. Then one price for the year, and nothing else ever.

SUBSCRIPTION
Didu is a yearly subscription with a free trial. The trial length and the price are shown in the app before you confirm.

Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your Apple Account settings.

Terms: https://didu.app/terms
Privacy: https://didu.app/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Didu Annual | $19.99 | per year |



## Version history (last 4 releases)

### 2.20.2 — 2026-09-09

We've made the subscription / account upgrades respond in realtime.

### 2.20.1 — 2026-09-01

Updated copy and small bug fixes.

### 2.20.0 — 2026-08-22

Small things this time. Saved drops load faster, the quiz remembers where you got to, and a handful of drops got their sources tidied up.

Keep telling us what you'd like to know about. We read all of it.

### 1.0 — 2025-09-26

No release notes.

## Apps similar to Didu

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Chartivate](https://appshunter.io/ios/app/chartivate/id6705130720) | — | Free | Education |
| [Knowlet: Daily Learning & Quiz](https://appshunter.io/ios/app/knowlet-daily-learning-and-quiz/id6754519612) | 4.8 (40) | Free | Education |
| [Spanish Word of the Day](https://appshunter.io/ios/app/spanish-word-of-the-day/id1495586383) | 4.7 (601) | Free | Education |
| [Language Learning - Verb Dojo](https://appshunter.io/ios/app/language-learning-verb-dojo/id1480814608) | 4.8 (1,376) | Free | Education |
| [Smart Art - Art History Escape](https://appshunter.io/ios/app/smart-art-art-history-escape/id1486560836) | 4.8 (514) | Free | Education |
| [Today in History: Factorium](https://appshunter.io/ios/app/today-in-history-factorium/id6447638380) | 4.7 (231) | Free | Education |

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-24.*