# CHM阅读器专业版 vs Private Voice Notes

The clearest difference is price: CHM阅读器专业版 at Free against Private Voice Notes's $1.29. CHM阅读器专业版 also leads on iOS requirement (15.6 vs 17.0). Private Voice Notes'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; Private Voice Notes costs $1.29 up front. CHM阅读器专业版 sells 3 in-app purchases, starting at $1.99 per month. Private Voice Notes asks for nothing beyond the download.

## The numbers

| Metric | CHM阅读器专业版 | Private Voice Notes |
| --- | --- | --- |
| Price | **Free** | $1.29 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Paid | — |
| Size | 7 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, Mac, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [宁伟 陈](https://appshunter.io/developer/1801975672) | [Myworkingmemory LLC](https://appshunter.io/developer/1892099684) |

## 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 |


### Private Voice Notes

[App page](https://appshunter.io/ios/app/private-voice-notes/id6779345022)

**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 Private Voice Notes free?

Private Voice Notes costs $1.29, with no in-app purchases.

### Do CHM阅读器专业版 or Private Voice Notes have ads?

Neither CHM阅读器专业版 nor Private Voice Notes shows ads.

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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.*