# Add Up to 21

> Add Up to 21 (iPhone/iPad app by Yonggao Yang.)

- Source: https://appshunter.io/ios/app/add-up-to-21/id1195741019 (this page in markdown: same URL + `.md`)
- Developer: [Yonggao Yang](https://appshunter.io/developer/775517831)
- Category: Education, Games, Card
- Price: $0.99
- Age rating: 4+
- Requires: iOS 8.0 · 22 MB
- Languages: English
- Released: 2017-01-18
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/add-up-to-21/id1195741019/reviews.md

## What is Add Up to 21?

Poker Blackjack is a popular game related to adding numbers to 21. This app adopts this idea to train your brain to add number fast without paper and pen.
You are challenged to do this as fast as you can within 3 minutes: pick cards from the 7 given number-cards so that the sum of them is 21. Each number-card is a poker card with a value in the range of 1 to 13.
The more you practice, the faster you will be able to pick the right numbers for the sum of 21. Doing this can truly sharpen your skills and performance to computing in brain without using pen and paper. 
Your best performance is saved, along with the date and time you created it.
This app is for pre-school, 1st grade, 2nd grade students and senior citizens who want to keep their brain sharp.


## Version history (last 4 releases)

### 1.3 — 2021-09-28

Update the app so that it runs on the device with the latest iOS version.

### 1.2 — 2020-03-02

adjust the screen layout so that it runs on various version of iOS

### 1.1 — 2017-01-30

Fix a critical bug.

### 1.0 — 2017-01-18

No release notes.

## Apps similar to Add Up to 21

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Piano Planet - Learn piano](https://appshunter.io/ios/app/piano-planet-learn-piano/id1135930351) | 4.8 (3,193) | Free | Education |
| [Learning Spanish - Basic Words](https://appshunter.io/ios/app/learning-spanish-basic-words/id1281290238) | 5.0 (1) | Free | Education |
| [Syllable Phonics](https://appshunter.io/ios/app/syllable-phonics/id1574077622) | — | Free | Education |
| [Emma - WCU](https://appshunter.io/ios/app/emma-wcu/id1468927796) | 5.0 (1) | Free | Education |
| [Idioms - Express like a native](https://appshunter.io/ios/app/idioms-express-like-a-native/id339391993) | 3.0 (6) | Free | Education |
| [Learn Chinese: For Beginners](https://appshunter.io/ios/app/learn-chinese-for-beginners/id1604141494) | 4.6 (47) | Free | Education |

## More apps by Yonggao Yang

- [Build Math Brain](https://appshunter.io/ios/app/build-math-brain/id775517828)
- [Tic-Tac-Toe against machine](https://appshunter.io/ios/app/tic-tac-toe-against-machine/id1199686175)
- [Game Black Hole](https://appshunter.io/ios/app/game-black-hole/id1263546989)
- [Photo-360](https://appshunter.io/ios/app/photo-360/id1501083629)
- [PVU360](https://appshunter.io/ios/app/pvu360/id1506382142)

All apps by Yonggao Yang: https://appshunter.io/developer/775517831

---

*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 2026-06-10.*