# 专利大王 vs 北控环境

The clearest difference is in-app purchases: 北控环境 at none against 专利大王's 5. 专利大王's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. 专利大王 sells 5 one-off in-app purchases. 北控环境 asks for nothing beyond the download.

## The numbers

| Metric | 专利大王 | 北控环境 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 5 weeks | — |
| Size | 36 MB | 54 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 17+ |
| Developer | [BEIJING INCOIDEA CO.LTD](https://appshunter.io/developer/1262262808) | [北京云隼科技有限公司](https://appshunter.io/developer/1696059823) |

## What reviewers say

### 专利大王

[App page](https://appshunter.io/ios/app/id1091971568)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 专利大王VIP月卡 | $8.99 | one-time |
| 专利大王VIP季卡 | $19.99 | one-time |
| 专利大王VIP半年卡 | $34.99 | one-time |
| 专利大王VIP年卡 | $59.99 | one-time |
| 专利大王VIP年费会员 | $64.99 | one-time |


### 北控环境

[App page](https://appshunter.io/ios/app/id6464238596)

**In-app purchases:** none


## Frequently asked questions

### Is 专利大王 free?

专利大王 is free to download, with in-app purchases available.

### Is 北控环境 free?

北控环境 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.*