# 21 CORRECT vs All World Flags Quiz Game

The clearest difference is ads: 21 CORRECT at none against All World Flags Quiz Game's shown. 21 CORRECT also leads on iOS requirement (9.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 21 CORRECT | All World Flags Quiz Game |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 5 days |
| Size | 15 MB | 61 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ONUR BEKMEN](https://appshunter.io/developer/1066017410) | [Mikhail Naumov](https://appshunter.io/developer/1749260887) |

## What reviewers say

### 21 CORRECT

[App page](https://appshunter.io/ios/app/21-correct/id1205145139)

**Features:** macOS Compatibility

**In-app purchases:** none


### All World Flags Quiz Game

[App page](https://appshunter.io/ios/app/all-world-flags-quiz-game/id6503438700)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 21 CORRECT free?

21 CORRECT is free to download, with no in-app purchases.

### Is All World Flags Quiz Game free?

All World Flags Quiz Game is free to download, with no in-app purchases.

### Do 21 CORRECT or All World Flags Quiz Game have ads?

All World Flags Quiz Game shows ads; 21 CORRECT does not.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*