# CHM阅读器专业版 vs SnapClean Pro

The clearest difference is price: CHM阅读器专业版 at Free against SnapClean Pro's $4.00. CHM阅读器专业版 also leads on update cadence (every 9 days vs every 3 months) and iOS requirement (15.6 vs 17). SnapClean Pro's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

CHM阅读器专业版 is free to download; SnapClean Pro costs $4.00 up front. CHM阅读器专业版 sells 3 in-app purchases, starting at $1.99 per month. SnapClean Pro asks for nothing beyond the download.

CHM阅读器专业版 ships an update every 9 days, SnapClean Pro every 3 months. The most recent releases landed on October 2, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | CHM阅读器专业版 | SnapClean Pro |
| --- | --- | --- |
| Price | **Free** | $4.00 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 months |
| Monetization | Paid | — |
| Size | 7 MB | 4 MB |
| Requires iOS | **15.6** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [宁伟 陈](https://appshunter.io/developer/1801975672) | [贺 周](https://appshunter.io/developer/1815397078) |

## What reviewers say

### CHM阅读器专业版

[App page](https://appshunter.io/ios/app/chm/id6746235244)

Easily view CHM files on your iPhone or iPad. This professional reader supports opening documents from various sources, offers quick navigation via table of contents, and includes full-text search. Enjoy comfortable reading with Dark Mode support.

**Highlights:** Open CHM files from Files, Mail, Safari, Automatic table of contents parsing, Full-text search, Dark Mode support, View help documents and tech manuals

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $1.99 | per month |
| 年度会员 | $9.99 | per year |
| 永久会员 | $12.99 | one-time |


### SnapClean Pro

[App page](https://appshunter.io/ios/app/snapclean-pro/id6771373915)

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

**In-app purchases:** none


## Frequently asked questions

### Is CHM阅读器专业版 free?

CHM阅读器专业版 is free to download, with in-app purchases available.

### Is SnapClean Pro free?

SnapClean Pro costs $4.00, with no in-app purchases.

### Do CHM阅读器专业版 or SnapClean Pro have ads?

Neither CHM阅读器专业版 nor SnapClean Pro shows ads.

### Which is updated more often, CHM阅读器专业版 or SnapClean Pro?

CHM阅读器专业版 ships an update every 9 days, and SnapClean Pro every 3 months. Most recently, CHM阅读器专业版 was updated on October 2, 2026 and SnapClean Pro on September 24, 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.*