# 宇环HRM vs 3D Model Viewer & Converter

The clearest difference is in-app purchases: 宇环HRM at none against 3D Model Viewer & Converter's 10. 宇环HRM also leads on update cadence (every 5 days vs every 3 weeks) and iOS requirement (12.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. 3D Model Viewer & Converter sells 10 in-app purchases, starting at $2.99 per 7 days. 宇环HRM asks for nothing beyond the download.

宇环HRM ships an update every 5 days, 3D Model Viewer & Converter every 3 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | 宇环HRM | 3D Model Viewer & Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.5 (2 ratings)](https://appshunter.io/ios/app/3d-model-viewer-and-converter/id6748610196/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | — | Freemium |
| Size | 84 MB | 18 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [宇环数控机床股份有限公司](https://appshunter.io/developer/1686857019) | [维 艾](https://appshunter.io/developer/1771300149) |

## What reviewers say

### 宇环HRM

[App page](https://appshunter.io/ios/app/hrm/id6743207026)

**Features:** macOS Compatibility

**In-app purchases:** none


### 3D Model Viewer & Converter

[App page](https://appshunter.io/ios/app/3d-model-viewer-and-converter/id6748610196)

This tool allows you to open, view, and convert a wide variety of 3D file formats on your Apple devices. It offers basic editing, cross-sectioning, and exploded views, with options for batch conversion and exporting projected views.

**Highlights:** Import numerous 3D formats, Convert between popular 3D formats, Basic editing tools, Cross-section and exploded views, Batch export support, Export projected views as SVG, Offline functionality

**Features:** Family Sharing, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Flex | $2.99 | per 7 days |
| Pro Light | $9.99 | per month |
| Pro Infinity | $59.99 | per year |
| Export as PNG | $2.99 | one-time |
| Export as OBJ | $3.99 | one-time |
| Export as USDZ | $3.99 | one-time |
| Export as STL | $3.99 | one-time |
| Unlock Projection View Export | $4.99 | one-time |
| Cross Section View | $6.99 | one-time |
| Export all formats | $16.99 | one-time |


## Frequently asked questions

### Is 宇环HRM free?

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

### Is 3D Model Viewer & Converter free?

3D Model Viewer & Converter is free to download, with in-app purchases available.

### Do 宇环HRM or 3D Model Viewer & Converter have ads?

Neither 宇环HRM nor 3D Model Viewer & Converter shows ads.

### Which is updated more often, 宇环HRM or 3D Model Viewer & Converter?

宇环HRM ships an update every 5 days, and 3D Model Viewer & Converter every 3 weeks. Most recently, 宇环HRM was updated on October 30, 2026 and 3D Model Viewer & Converter on October 30, 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.*