# ChmPlus Pro vs PDF Reader

The clearest difference is price: PDF Reader at Free against ChmPlus Pro's $6.99. PDF Reader also leads on rating (4.9 vs 2.7) and review sentiment (71% vs 54%). ChmPlus Pro's advantage is in-app purchases (none vs 5) and update cadence (every 9 days vs every 3 weeks). On ratings volume, ads, device support and iOS requirement there is nothing between them.

PDF Reader is free to download; ChmPlus Pro costs $6.99 up front. PDF Reader sells 5 one-off in-app purchases. ChmPlus Pro asks for nothing beyond the download.

PDF Reader holds the better App Store score, 4.9 against 2.7. Both are backed by a comparable volume of ratings — 9 and 8 respectively. Written reviews point the same way: 54% of ChmPlus Pro's written reviews are positive against 71% of PDF Reader's.

ChmPlus Pro ships an update every 9 days, PDF Reader every 3 weeks. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ChmPlus Pro | PDF Reader |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [2.7 (9 ratings)](https://appshunter.io/ios/app/chmplus-pro-chmepub-reader/id441521818/reviews) | **[4.9 (8 ratings)](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035/reviews)** |
| Number of ratings | **9** | 8 |
| Positive reviews | 54.5% of reviews | **71.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 10 MB | 50 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [兰桂 吴](https://appshunter.io/developer/433671404) | [绪强 任](https://appshunter.io/developer/898564038) |

## What reviewers say

### ChmPlus Pro

[App page](https://appshunter.io/ios/app/chmplus-pro-chmepub-reader/id441521818)

This app allows you to read and manage various document formats, including CHM and EPUB ebooks. It offers features like highlighting, bookmarking, searching, and file transfer. Secure your documents with a passcode lock and organize your files with ease.

**Highlights:** CHM/EPUB document reading, Highlight, bookmark, and annotate, Document-wide search, Wi-Fi and iTunes file transfer, Passcode lock for files, Support for multiple file types, Create and edit text documents

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

**In-app purchases:** none

**What reviewers like**

- 👍 Generally good for CHM files
- 🚀 Fast opening of files
- 🔍 Powerful search function
- 📂 Good file organization
- ✨ Clean interface

**What reviewers complain about**

- 🐛 Frequent crashes and freezes
- 🐛 Highlighting issues (not working, disappearing)
- 🐛 Displaying Chinese characters as garbled text (亂碼)
- 🐛 Slow copy/paste and search response
- 🐛 Some CHM files not fully opening

**Reported bugs**

- Chinese characters displayed as garbled text (亂碼)
- Search feature broken for numbers (recent)
- Copying is slow
- App crashes when searching
- Editing text feature removed after update

**Requested features**

- Adjustable font size
- PDF left-right page turning
- EPUB file support
- Expand/collapse table of contents
- Adapt to full-screen displays


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035)

This app allows you to read various document formats like PDF, EPUB, and CHM on your iPhone and iPad. It supports file import, text search, annotation, and even previewing MS Office files and videos. A simple to-do list and auto-save reading progress are also included.

**Highlights:** Reads PDF, CHM, EPUB, TXT files, PDF annotation and text search, File import via Files, Airdrop, iTunes, web, MS Office and video file preview, Simple To-Do list functionality, Auto-save reading progress

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader App donate | $0.99 | one-time |
| Dropbox Support | $0.99 | one-time |
| Remove Ad | $4.99 | one-time |
| Todo donate | $7.99 | one-time |
| Todo donate | $14.99 | one-time |


## Frequently asked questions

### Is ChmPlus Pro free?

ChmPlus Pro costs $6.99, with no in-app purchases.

### Is PDF Reader free?

PDF Reader is free to download, with in-app purchases available.

### Which has better reviews, ChmPlus Pro or PDF Reader?

PDF Reader is rated higher. ChmPlus Pro averages 2.7 out of 5 from 9 ratings, while PDF Reader averages 4.9 from 8 ratings.

### Do ChmPlus Pro or PDF Reader have ads?

Neither ChmPlus Pro nor PDF Reader shows ads.

### Which is updated more often, ChmPlus Pro or PDF Reader?

ChmPlus Pro ships an update every 9 days, and PDF Reader every 3 weeks. Most recently, ChmPlus Pro was updated on October 12, 2026 and PDF Reader on October 8, 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.*