# Unit Converter vs MHT Viewer

The clearest difference is in-app purchases: Unit Converter at none against MHT Viewer's 4. MHT Viewer's advantage is update cadence (every 11 days vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MHT Viewer sells 4 in-app purchases, starting at $3.99 per 7 days. Unit Converter asks for nothing beyond the download.

Unit Converter ships an update every 9 months, MHT Viewer every 11 days. The most recent releases landed on September 15, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Unit Converter | MHT Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/mht-viewer-mhtml-reader/id6761450357/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 11 days** |
| Monetization | — | Freemium |
| Size | 12 MB | 16 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Fenuku Kekeli](https://appshunter.io/developer/1822419894) | [延平 陈](https://appshunter.io/developer/1833168926) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-convert-units/id6749213264)

**Features:** macOS Compatibility

**In-app purchases:** none


### MHT Viewer

[App page](https://appshunter.io/ios/app/mht-viewer-mhtml-reader/id6761450357)

Easily open and read MHT and MHTML web archive files offline on your iPhone and iPad. Convert these files to HTML format while preserving layout and images. Access saved web pages quickly and securely on your device.

**Highlights:** Open MHT and MHTML files, Accurate web page rendering, Offline access, Convert MHT to HTML, Share or export content, Private and secure file handling

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MHT Viewer Pro Weekly | $3.99 | per 7 days |
| MHT Viewer Pro Monthly | $5.99 | per month |
| MHT Viewer Pro Yearly | $9.99 | per year |
| MHT Viewer Premium | $19.99 | one-time |


## Frequently asked questions

### Is Unit Converter free?

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

### Is MHT Viewer free?

MHT Viewer is free to download, with in-app purchases available.

### Do Unit Converter or MHT Viewer have ads?

Neither Unit Converter nor MHT Viewer shows ads.

### Which is updated more often, Unit Converter or MHT Viewer?

Unit Converter ships an update every 9 months, and MHT Viewer every 11 days. Most recently, Unit Converter was updated on September 15, 2026 and MHT Viewer on September 18, 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.*