# 認知保護王 vs 碳險

The clearest difference is device support: 認知保護王 at 2 against 碳險's —. 碳險's advantage is iOS requirement (12.0 vs 17.1). 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 | 認知保護王 | 碳險 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Fortnightly | — |
| Size | 147 MB | 34 MB |
| Requires iOS | 17.1 | **12.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 9+ |
| Developer | [YIZE LIAO](https://appshunter.io/developer/1511365129) | [AICamp](https://appshunter.io/developer/1566971567) |

## What reviewers say

### 認知保護王

[App page](https://appshunter.io/ios/app/id1601522643)

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

**In-app purchases:** none


### 碳險

[App page](https://appshunter.io/ios/app/id6477148616)

**In-app purchases:** none


## Frequently asked questions

### Is 認知保護王 free?

認知保護王 is free to download, with no in-app purchases.

### Is 碳險 free?

碳險 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.*