# 危险作业管控 vs 管道计算器Pro

The clearest difference is in-app purchases: 危险作业管控 at none against 管道计算器Pro's 3. 管道计算器Pro's advantage is update cadence (every 9 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 管道计算器Pro sells 3 one-off in-app purchases. 危险作业管控 asks for nothing beyond the download.

危险作业管控 ships an update monthly, 管道计算器Pro every 9 days. The most recent releases landed on October 3, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 危险作业管控 | 管道计算器Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Size | 26 MB | 53 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [浙江易航海信息技术有限公司](https://appshunter.io/developer/1279218875) | [ChenShu Zhuang](https://appshunter.io/developer/1477949813) |

## What reviewers say

### 危险作业管控

[App page](https://appshunter.io/ios/app/id6449081167)

**Features:** macOS Compatibility

**In-app purchases:** none


### 管道计算器Pro

[App page](https://appshunter.io/ios/app/pro/id6758931508)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $3.99 | one-time |
| 年度会员 | $14.99 | one-time |
| 永久会员 | $29.99 | one-time |


## Frequently asked questions

### Is 危险作业管控 free?

危险作业管控 is free to download, with no in-app purchases.

### Is 管道计算器Pro free?

管道计算器Pro is free to download, with in-app purchases available.

### Do 危险作业管控 or 管道计算器Pro have ads?

Neither 危险作业管控 nor 管道计算器Pro shows ads.

### Which is updated more often, 危险作业管控 or 管道计算器Pro?

危险作业管控 ships an update monthly, and 管道计算器Pro every 9 days. Most recently, 危险作业管控 was updated on October 3, 2026 and 管道计算器Pro on October 14, 2026.

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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.*