# iEMS vs 光伏智慧工地

The clearest difference is update cadence: iEMS at every 4 months against 光伏智慧工地's every 18 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.

iEMS ships an update every 4 months, 光伏智慧工地 every 18 months. The most recent releases landed on September 16, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | iEMS | 光伏智慧工地 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 18 months |
| Size | 41 MB | 46 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Shenzhen ZTE Software Co., Ltd.](https://appshunter.io/developer/1863573894) | [蔚莱信息科技(南京)有限公司](https://appshunter.io/developer/1710867044) |

## What reviewers say

### iEMS

[App page](https://appshunter.io/ios/app/iems/id6450133373)

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

**In-app purchases:** none


### 光伏智慧工地

[App page](https://appshunter.io/ios/app/id6468901368)

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

**In-app purchases:** none


## Frequently asked questions

### Is iEMS free?

iEMS is free to download, with no in-app purchases.

### Is 光伏智慧工地 free?

光伏智慧工地 is free to download, with no in-app purchases.

### Do iEMS or 光伏智慧工地 have ads?

Neither iEMS nor 光伏智慧工地 shows ads.

### Which is updated more often, iEMS or 光伏智慧工地?

iEMS ships an update every 4 months, and 光伏智慧工地 every 18 months. Most recently, iEMS was updated on September 16, 2026 and 光伏智慧工地 on August 16, 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.*