# 21 vs Crystara

The clearest difference is ads: Crystara at none against 21's shown. On price, in-app purchases, device support and iOS requirement 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 | Crystara |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 days | — |
| Size | 39 MB | 7 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chee Hoong Khor](https://appshunter.io/developer/1880679655) | [ROKONTECH LLC](https://appshunter.io/developer/1347808056) |

## What reviewers say

### 21

[App page](https://appshunter.io/ios/app/21-twenty-one/id6759793279)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Crystara

[App page](https://appshunter.io/ios/app/crystara/id6760728987)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 21 free?

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

### Is Crystara free?

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

### Do 21 or Crystara have ads?

21 shows ads; Crystara 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.*