# M21 vs 403

The clearest difference is device support: M21 at 2 against 403's —. M21 also leads on iOS requirement (12.0 vs 17.0). On price and in-app purchases 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 | M21 | 403 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/403/id6469257764/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 5 weeks | — |
| Monetization | — | Free |
| Size | 65 MB | 10 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | — |
| Age rating | 9+ | 17+ |
| Developer | [广州惟为网络科技有限公司](https://appshunter.io/developer/1000338390) | [泽强 全](https://appshunter.io/developer/918792381) |

## What reviewers say

### M21

[App page](https://appshunter.io/ios/app/m21-3x/id1178637217)

**In-app purchases:** none


### 403

[App page](https://appshunter.io/ios/app/403/id6469257764)

Join a fictional information agency dedicated to fighting crime and upholding justice. Submit intelligence, create case files for various universes, and contribute to a shared world of mystery and deduction.

**Highlights:** Review agency case files, Dedicated case file creation tools, GPU-powered case file illustrations, Query game and video library, Contribute intelligence and clues

**In-app purchases:** none


## Frequently asked questions

### Is M21 free?

M21 is free to download, with no in-app purchases.

### Is 403 free?

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

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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.*