# ChmPlus Pro: CHM/EPUB Reader — Read CHM/EPUB/MHT documents

> CHM/EPUB reader with file management and document annotation features. (iPhone/iPad app by 兰桂 吴.)

- Source: https://appshunter.io/ios/app/chmplus-pro-chmepub-reader/id441521818 (this page in markdown: same URL + `.md`)
- Developer: [兰桂 吴](https://appshunter.io/developer/433671404)
- Category: Books, Utilities
- Price: $6.99
- Rating: 2.70/5 from 9 App Store ratings · 123 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 10 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2011-06-09
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/chmplus-pro-chmepub-reader/id441521818/reviews.md

## What is ChmPlus Pro?

ChmPlus Reader (CHM+) is a feature-rich CHM (Microsoft Compiled HTML Help) document/ebook reader for iPhone/iPad.

ChmPlus Reader now supports passcode lock!

CHM/EPUB Document Support:
• Highlight / bookmark / annotation
• Search (find on page & document-wide search)
• Open CHM files instantly (even with huge files)
• Supports CHM files in different languages
• Supports pinch to zoom
• Navigate through table of contents
• Supports full screen mode
• Supports auto rotation and orientation lock
• Long press on an image to:
  1) save the image to photo album
  2) copy the image to clipboard (and paste it into your email)
• Night mode (white text on black background)

File Management:
• Transfer files via Wi-Fi (FTP & HTTP) / iTunes File Sharing
• Create/copy/move/rename/delete files and folders
• Passcode lock
• Support opening document with other applications
• Import documents from other applications
• Create/edit text documents
• Send multiple Email attachments
• Create .zip archives
• Save image to Photos
• Browse and manage remote files (FTP/FTPS, SFTP and WebDAV)

Supported File Types:
• .chm (Microsoft Compiled HTML Help)
• .epub (electronic publication)
• MS Office - .doc, .ppt., .xls, .docx, .xlsx, .pptx
• iWork '08/'09 (Pages, Numbers, Keynote)
• PDF, HTML, RTF, .mht, Safari webarchives and text files
• .zip, .rar, .7z, .bz2, .gz, .tar and various other archive file types
• High resolution images
• Audio and video

==SUPPORT==
- https://langui.net/chmplus/

## Key features

- 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

## Chart rankings

- #197 in Top Paid · Book (US App Store)

## What do users think of ChmPlus Pro?

Overall sentiment: mixed

**Pros**

- 👍 Generally good for CHM files
- 🚀 Fast opening of files
- 🔍 Powerful search function
- 📂 Good file organization
- ✨ Clean interface
- 🔄 Frequent updates and developer responsiveness
- 🗄️ Supports various file types
- 📶 Easy file transfer (AirDrop, Wi-Fi)
- 💯 Worth the price for some users
- 📖 Good for reading medical textbooks

**Cons**

- 🐛 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
- 🐛 Editing text feature removed
- 🐛 UI design is poor/outdated
- 🐛 Navigation issues in PDF/EPUB
- 🐛 Laggy page turning
- 🐛 Inconsistent performance with free version
- 🐛 Expensive for the features offered
- 🐛 Lack of some basic features in paid version

**Commonly 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
- Some CHM files cannot be fully opened
- Highlighting not working or disappearing
- PDF navigation issues
- Page turning is laggy
- App locks up or freezes
- Black screen or screen jumping issues
- Subdirectories cannot be opened
- MHT file errors
- Frequent crashes with large PDFs or highlighting
- Table of contents not permanently displayed
- Cannot display secondary windows
- Slow highlighting/selection
- Swipe to turn page not working
- Text smudging after zooming on iOS 7
- Highlighting not saving
- App crashes when defining words
- App jumps to the beginning of text
- Live search on page is too slow
- Highlight option not working properly
- Notes disappear after reopening
- Chapters change spontaneously
- Cannot delete folders
- App freezes when using highlighting
- PDF is read-only
- Pixelated icons on new iPads
- No function for CHM-Files (no content shown)
- Search function not working for CHM files
- Unhighlight words after search

**Most requested features**

- Adjustable font size
- PDF left-right page turning
- EPUB file support
- Expand/collapse table of contents
- Adapt to full-screen displays
- Highlighting for PDF and EPUB
- Freehand annotation/drawing
- Split screen for notes
- Add folders via iTunes library
- Dark mode/night viewing
- Private lock for files
- Support for .rar and .zip files
- Reading .cbr files
- Better iOS 7 adaptation
- Continuous scrolling
- Font selection and line spacing adjustments
- Copy annotations to PC
- Export feature
- Open .rar and .zip
- Read .cbr
- Develop for iOS 7
- Block orientation defective
- Font selection
- No refund option
- Move files within folders
- Better UI/shelf-like appearance
- Add .mobi file support
- Built-in browser
- Unhighlight words after search
- Add private lock
- Search all over a document
- Add folder support on iTunes library
- Inverse background mode for night time viewing

## Recent user reviews (10 of 123)

All indexed reviews: https://appshunter.io/ios/app/chmplus-pro-chmepub-reader/id441521818/reviews.md

### 4/5 — 希望可以调整字体大小

*2024-04-17*

如题，有这个功能就更好了

### 5/5 — 好用

*2023-10-15*

非常好用

### 1/5 — 忽然看不了中文了

*2023-01-22*

今天偶然打开了一个陈年旧档，居然中文都显示成了乱码，前几年没这毛病啊

### 3/5 — 用心点吧，买了专业版，居然有的chm不能全打开

*2022-11-26*

有点失望啊，又的功能还不如免费版的

### 4/5 — 为什么突然全部CHM文档都变成乱码了？

*2022-11-11*

如题

### 3/5 — 为什么不能编辑文本了？

*2022-11-10*

以前打开txt是可以直接编辑文本的，更新后这个功能没了！？

**Developer response:** 您好，
请在文件列表中长按相应文件，从弹出菜单中选择“编辑”。
谢谢！

### 1/5 — 更新完了反而出了很多乱码

*2022-09-28*

如题

**Developer response:** 您好，请更新至最新版后再试试。谢谢！

### 1/5 — 为什么复制时反应这么慢？

*2022-09-22*

一搜索就闪退

**Developer response:** 您好，请更新至最新版后再试试。谢谢！

### 5/5 — Recent Update Broke Search - Revised

*2022-09-13, version 5.1.2*

Recent update broke search feature when searching for numbers, ie. 1, 2, 3, 1021, 2459, etc. Searching for letters or words works correctly.

20220913: Developer Resolved Issue, Back to 5 Stars!

### 4/5 — 望有PDF【左右翻页】功能

*2022-09-09*

能否加入PDF文件【左右翻页】的功能，还有对EPUB文件的支持。

**Developer response:** 您好，CHM+ 现已更新，如使用中有任何问题，请与我们联系。谢谢！

## Frequently asked questions about ChmPlus Pro

### What is ChmPlus Pro?

ChmPlus Pro is a feature-rich application designed for iPhone and iPad that functions as a reader for CHM (Microsoft Compiled HTML Help) and EPUB ebook documents. It also includes robust file management capabilities.

### What file formats does ChmPlus Pro support?

The app supports a wide range of file formats including .chm, .epub, MS Office documents (.doc, .ppt, .xls, etc.), iWork files, PDF, HTML, RTF, .mht, Safari webarchives, text files, various archive types (.zip, .rar, etc.), high resolution images, audio, and video.

### How can I transfer files to ChmPlus Pro?

You can transfer files to the app using Wi-Fi, which includes FTP and HTTP protocols, or through iTunes File Sharing. It also supports importing documents from other applications and browsing remote files via FTP/FTPS, SFTP, and WebDAV.

### Does ChmPlus Pro offer any security features?

Yes, ChmPlus Pro supports a passcode lock feature, allowing you to secure your documents. This helps protect your sensitive information stored within the app.

### What are the reading features available?

When reading documents, you can highlight text, create bookmarks, and add annotations. The app also provides search functionality for both individual pages and entire documents, supports pinch-to-zoom, and offers a night mode for comfortable reading in low light conditions.

## Version history (last 5 releases)

### 5.2.1 — 2023-10-15

• Fix the CHM/EPUB viewer search button issue (macOS Sonoma)

### 5.2 — 2023-06-16

• Support remote drives (FTP/FTPS, SFTP and WebDAV)

### 5.1.8 — 2022-10-26

• Fix the CHM document search issue

### 5.1.7 — 2022-10-19

• Support CHM with .mht files
• Fix .webarchive display issue

### 5.1.6 — 2022-10-14

• Fix some minor issues

## Apps similar to ChmPlus Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Epub Reader -read epub,chm,txt](https://appshunter.io/ios/app/epub-reader-read-epubchmtxt/id1296870631) | 4.5 (11,089) | Free | Books |
| [ComicShare - Streaming Reader](https://appshunter.io/ios/app/comicshare-streaming-reader/id642097030) | 4.4 (48) | $3.99 | Books |
| [Manga Viewer - CBZ(CBR) Reader](https://appshunter.io/ios/app/manga-viewer-cbzcbr-reader/id1309007086) | 4.8 (344) | Free | Books |
| [阅界-多格式电子书阅读器](https://appshunter.io/ios/app/id6744491327) | — | Free | Books |
| [CHM+ - CHM Document Reader](https://appshunter.io/ios/app/chm-plus-chm-document-reader/id6745147168) | 3.0 (2) | Free | Books |
| [CHMate+: EPUB & CHM Reader](https://appshunter.io/ios/app/chmate-plus-epub-and-chm-reader/id324516521) | 3.8 (8) | $9.99 | Books |

## More apps by 兰桂 吴

- [ChmPlus Lite: CHM/EPUB Reader](https://appshunter.io/ios/app/chmplus-lite-chmepub-reader/id443454952)
- [ZipApp Pro: The Unarchiver](https://appshunter.io/ios/app/zipapp-pro-the-unarchiver/id522281602)
- [ZipApp Lite: The Unarchiver](https://appshunter.io/ios/app/zipapp-lite-the-unarchiver/id585600850)
- [iSVN](https://appshunter.io/ios/app/isvn/id861041982)
- [iSVN Lite](https://appshunter.io/ios/app/isvn-lite/id1489780160)

All apps by 兰桂 吴: https://appshunter.io/developer/433671404

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*