# ChmPlus Pro: CHM/EPUB Reader

> Read CHM/EPUB/MHT documents

Canonical page: [https://chrome-stats.com/d/id441521818](https://chrome-stats.com/d/id441521818)

## Overview

- **ID:** `id441521818`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 兰桂 吴
- **Category:** Books
- **Rating:** 2.70 / 5 (9 ratings)
- **Version:** 5.2.1
- **Last updated:** 2023-10-15
- **First published:** 2011-06-09
- **Size:** 9.51 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/chmplus-pro-chm-epub-reader/id441521818)
- **Website:** [https://langui.net/](https://langui.net/)
- **Privacy policy:** [https://langui.net/privacy-policy/](https://langui.net/privacy-policy/)

## Description

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/

## Rankings

- #443,255 — Overall

## Review summary

Reviews praise CHMPlus Pro for a robust CHM/EPUB reader with easy file transfer and strong developer support, often naming it among the best iOS CHM readers. However, recurring issues—unreliable highlighting, crashes, and slow performance—dominate feedback. Some users also cite UI/navigation quirks and feature gaps. Updates have addressed some problems, but reliability and speed remain the main drawbacks before broader usability is assured.

### Pros

- Strong CHM/EPUB feature set including document-wide search, library organization, annotations, and support for multiple file types.
- Easy file upload and Wi‑Fi transfer of books between devices.
- Active and responsive developer support with frequent updates.
- Widely regarded as one of the best CHM readers on iOS.

### Cons

- Highlighting is unreliable or nonfunctional across many documents (appears broken, disappears, or only works inconsistently).
- Crashes and arbitrary instability reported by multiple users.
- Slow performance and lag, especially with large books or during text selection/highlighting.

## Similar extensions and apps

- [ChmPlus Lite: CHM/EPUB Reader](https://chrome-stats.com/d/id443454952) — 3.60 / 5
- [CHM+ - CHM Document Reader](https://chrome-stats.com/d/id6745147168) — 3.00 / 5
- [CHM Reader: Offline & PDF](https://chrome-stats.com/d/id6502591888)
- [CHMate+: EPUB & CHM Reader](https://chrome-stats.com/d/id324516521) — 3.80 / 5
- [CHM Sharp](https://chrome-stats.com/d/id467098001) — 3.80 / 5
- [CHMate: EPUB & CHM Reader](https://chrome-stats.com/d/id335157929) — 3.60 / 5
- [Epub Reader -read epub,chm,txt](https://chrome-stats.com/d/id1296870631) — 4.50 / 5
- [Ebook Reader Pro](https://chrome-stats.com/d/id1505158572) — 2.00 / 5
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- [CHM Reader - read chm, txt](https://chrome-stats.com/d/id6758199572) — 5.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id441521818)