ChmPlus Pro vs PDF Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChmPlus Pro
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.
- 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
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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/
PDF Reader
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.
- 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
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PDF Reader - Mini Version is an amazing reader App on iPhone and iPad Main Fatures: 1. support read pdf、chm、epub、txt file 2. support pdf annotation and text search 3. support import file via Files、Airdrop、iTunes、web browser 4. support MS office Word、Excel、PPT、Video and many other file types preview 5. support simple Todo list 6. support auto save reading progress 7. support Baidu Net Disk
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ChmPlus Pro | PDF Reader |
|---|---|---|
| Price | $6.99 | Free — better |
| Rating | 2.7 (9 ratings) | 4.9 (8 ratings) — better |
| Positive reviews | 54.5% of reviews | 71.4% of reviews — better |
| Number of ratings | 9 — better | 8 |
| Update frequency | Every 9 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 10 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | 兰桂 吴 | 绪强 任 |
Customer experience
ChmPlus Pro
PDF Reader
Bugs and requests
ChmPlus Pro
Reported bugs
33 issues- 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
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- 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
Requested features
33 requests- Adjustable font size
- PDF left-right page turning
- EPUB file support
- Expand/collapse table of contents
- Adapt to full-screen displays
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- 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
PDF Reader
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ChmPlus Pro
No in-app purchases
PDF Reader
- Reader App donate$0.99
- Dropbox Support$0.99
- Remove Ad$4.99
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- Todo donate$7.99
- Todo donate$14.99
