# 锁掌柜/QRMaster vs AI_Known

The clearest difference is device support: 锁掌柜/QRMaster at 2 against AI_Known's —. 锁掌柜/QRMaster also leads on iOS requirement (12.0 vs 16.4). 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 | 锁掌柜/QRMaster | AI_Known |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 3 weeks | — |
| Size | 85 MB | 101 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 17+ |
| Developer | [GuangZhouChangLianInformationTechnologyCompany](https://appshunter.io/developer/977124142) | [涛 尹](https://appshunter.io/developer/1706586976) |

## What reviewers say

### 锁掌柜/QRMaster

[App page](https://appshunter.io/ios/app/qrmaster/id979781966)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI_Known

[App page](https://appshunter.io/ios/app/ai-known/id6465623947)

**In-app purchases:** none


## Frequently asked questions

### Is 锁掌柜/QRMaster free?

锁掌柜/QRMaster is free to download, with no in-app purchases.

### Is AI_Known free?

AI_Known 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.*