# 中央空调销装维 vs 工程师APP

The clearest difference is update cadence: 工程师APP at monthly against 中央空调销装维's every 16 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

中央空调销装维 ships an update every 16 months, 工程师APP monthly. Both last shipped on October 25, 2026.

## The numbers

| Metric | 中央空调销装维 | 工程师APP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Monthly** |
| Size | 24 MB | 66 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [伟 钟](https://appshunter.io/developer/1599099633) | [观成 余](https://appshunter.io/developer/1073429239) |

## What reviewers say

### 中央空调销装维

[App page](https://appshunter.io/ios/app/id1599099631)

**Features:** macOS Compatibility

**In-app purchases:** none


### 工程师APP

[App page](https://appshunter.io/ios/app/app/id1669378563)

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

**In-app purchases:** none


## Frequently asked questions

### Is 中央空调销装维 free?

中央空调销装维 is free to download, with no in-app purchases.

### Is 工程师APP free?

工程师APP is free to download, with no in-app purchases.

### Do 中央空调销装维 or 工程师APP have ads?

Neither 中央空调销装维 nor 工程师APP shows ads.

### Which is updated more often, 中央空调销装维 or 工程师APP?

中央空调销装维 ships an update every 16 months, and 工程师APP monthly. Most recently, 中央空调销装维 was updated on October 25, 2026 and 工程师APP on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*