# 21 vs Device Check & Hardware Test

The clearest difference is iOS requirement: Device Check & Hardware Test at 16.6 against 21's 18.4. On price, ads, 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 | Device Check & Hardware Test |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Size | 11 MB | 2 MB |
| Requires iOS | 18.4 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Najib El guertit](https://appshunter.io/developer/1816291075) | [国 李](https://appshunter.io/developer/1558261035) |

## What reviewers say

### 21

[App page](https://appshunter.io/ios/app/21-card/id6746346266)

**Features:** macOS Compatibility

**In-app purchases:** none


### Device Check & Hardware Test

[App page](https://appshunter.io/ios/app/device-check-and-hardware-test/id6757124821)

**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 Device Check & Hardware Test free?

Device Check & Hardware Test is free to download, with no in-app purchases.

### Do 21 or Device Check & Hardware Test have ads?

Neither 21 nor Device Check & Hardware Test shows ads.

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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.*