# 工程e vs D

The clearest difference is iOS requirement: 工程e at 9.0 against D's 13.0. On price, update cadence, ads 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.

工程e ships an update monthly, D every 2 months. The most recent releases landed on October 19, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 工程e | D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Size | 101 MB | 15 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Yun Lian Wan Qi Technology Co., Ltd.](https://appshunter.io/developer/1138675930) | [Winkong Marine Engineering Co.,Ltd.](https://appshunter.io/developer/1602619555) |

## What reviewers say

### 工程e

[App page](https://appshunter.io/ios/app/e/id1507935157)

**Features:** macOS Compatibility

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-vesselkeeper/id6677012335)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 工程e free?

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

### Is D free?

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

### Do 工程e or D have ads?

Neither 工程e nor D shows ads.

### Which is updated more often, 工程e or D?

工程e ships an update monthly, and D every 2 months. Most recently, 工程e was updated on October 19, 2026 and D on October 6, 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.*