Comparison

ChmPlus Lite vs PDF Expert

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ChmPlus Lite

This app allows you to read and manage various document formats, including CHM and EPUB, on your iPhone or iPad. It offers features like highlighting, bookmarking, searching, and file transfer. You can also manage files, create text documents, and save images.

Highlights
  • Read CHM and EPUB files
  • Highlight, bookmark, and annotate
  • Full-text search
  • Wi-Fi and iTunes file transfer
  • Passcode lock for files
  • Support for multiple document and archive formats
Features
Read full 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/

About

PDF Expert

This app allows you to edit, annotate, fill out forms, and convert PDF documents. It offers AI-powered summarization and analysis, along with tools to merge, sign, and protect your files. Work seamlessly across Apple devices with a user-friendly interface.

Highlights
  • Edit PDF text and images
  • Annotate and highlight PDFs
  • Fill out PDF forms
  • Convert files to and from PDF
  • AI-powered summarization and analysis
  • Merge and combine PDF files
  • Sign documents with e-signatures
Features
Read full description

PDF Expert is a fast and easy PDF app to read, annotate, fill and sign PDF forms, convert files to PDF, and merge, split or compress documents – all in one intuitive app for iPhone, iPad, Mac & Vision Pro. Read PDF files with comfort, highlight and mark up text, fill out forms, sign contracts, create and convert PDFs, and summarize long documents in seconds with AI-powered tools. Unlock unlimited possibilities with PDF Expert Premium and work across all your Apple devices. "PDF Expert is one of my must-have iPad apps and a desktop-class PDF reader." – MacStories "The best app for managing, editing, and reading PDFs on your iPad." – The Sweet Setup ▶ WITH PDF EXPERT, YOU CAN: READ PDFs - PDF reader with Day, Night, and Sepia modes for comfortable reading anytime - Scroll PDFs vertically or horizontally and search text in any document - Open and view PDF files from email, web, Files, or any app via the Share menu - Read PDFs out loud with Text to Speech ANNOTATE AND MARK UP PDFs - Highlight, underline, and strike through text in your PDFs - Mark up documents with pen, shapes, text, notes, and comments - Add stamps such as Approved or Confidential - Record your voice and add audio notes to PDFs FILL AND SIGN PDF FORMS - Fill out PDF forms with text fields, checkboxes, and radio buttons - Sign PDF documents in seconds – draw your signature or add it from an image - Save your signature to sign contracts, agreements, invoices, and applications faster - Fill, sign, and send forms right from your iPhone – no printing or scanning needed - Supports all major form formats, including AcroForms and static XFA forms ***PREMIUM FEATURES*** EDIT PDFs - Edit text directly in a PDF – just as you would in a Word document - Add, replace, and resize images in your PDFs - Add links to other pages or websites - Add outlines to navigate large PDFs CREATE AND CONVERT PDFs - Create PDFs from Word files, images, and other documents - Convert Word to PDF, JPG to PDF, and PNG to PDF in seconds - Convert PDF to Word, Excel, PowerPoint, JPG, PNG, and TXT MERGE, SPLIT AND ORGANIZE PDFs - Merge and combine multiple PDF files into one - Split PDFs and extract pages into a new file - Add, delete, rotate, and reorder pages with thumbnail preview COMPRESS PDFs - Compress PDFs to reduce file size for email and sharing - Shrink large PDF files to save space on your device SUMMARIZE PDFs WITH AI – PDF COPILOT - List Main Points – get key takeaways from any PDF - Summarize – get concise summaries of entire PDFs or annotations - Ask Anything – find details with AI answers and references - Explain – get instant explanations of words or phrases PROTECT YOUR FILES - Password-protect PDF Expert - Redact – permanently black out sensitive information WORK WITH SCANNED DOCUMENTS - Open scanned PDFs to fill out, sign, annotate, and share CONSTRUCTION TOOLS - Scale and measure drawings with the Measure tab - Polygon, polyline, and redline tools MORE FEATURES - Customizable toolbar - Presentation Mode - Print and share PDFs via email or cloud ONE ACCOUNT FOR ALL YOUR APPLE DEVICES One Premium subscription covers PDF Expert on iPhone, iPad, and Mac – no need to buy versions separately. Read more about our terms and conditions here: https://pdfexpert.com/privacy https://pdfexpert.com/terms Don’t hesitate to reach out to us at http://readdle.com/contact

Screenshots

ChmPlus Lite4 screens
PDF Expert4 screens

Verdict

The call

The clearest difference is rating: PDF Expert at 4.7 against ChmPlus Lite's 3.6. PDF Expert also leads on ads (none vs shown) and ratings volume (217K vs 11). ChmPlus Lite's advantage is in-app purchases (none vs 10) and iOS requirement (11.0 vs 16.0). On price, review sentiment, update cadence and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. PDF Expert sells 9 in-app purchases, starting at $9.99 per month. ChmPlus Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

PDF Expert holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: PDF Expert has 217K ratings behind it against 11, so its average is the more settled of the two. Written reviews complicate that: 49% of ChmPlus Lite's written reviews are positive against 45% of PDF Expert's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

ChmPlus Lite ships an update monthly, PDF Expert fortnightly. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard6 real differences · 5 level
ChmPlus Lite versus PDF Expert: the parameters behind the verdict, then further details
ParameterChmPlus LitePDF Expert
PriceFreeFree
Rating3.6 (11 ratings)4.7 (217K ratings) — better
Positive reviews48.8% of reviews — better45.2% of reviews
Number of ratings11217K — better
Update frequencyMonthlyFortnightly — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#80 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better16.0
Further details — not scored
Size13 MB301 MB
Age rating4+4+
Developer兰桂 吴Readdle Technologies Limited

Customer experience

ChmPlus Lite

All ratings11 ratings
Positive72.7%
Neutral0.0%
Negative27.3%
Written reviews86 reviews
Positive48.8%
Neutral15.1%
Negative36.0%

PDF Expert

All ratings216,255 ratings
Positive92.4%
Neutral2.3%
Negative5.3%
Written reviews1,186 reviews
Positive45.2%
Neutral7.5%
Negative47.3%

Bugs and requests

ChmPlus Lite

Not enough reviews yet to summarise bugs or requests.

PDF Expert

Reported bugs

4 issues
  • Corrupted PDFs after editing
  • Sync issues with cloud storage providers
  • Unexpected loss of annotations and edits
  • Unreliable performance on older iPad models

Requested features

5 requests
  • Improved palm rejection for Apple Pencil
  • Customizable toolbar and annotation presets
  • Better integration with other productivity apps
  • More flexible file management and organization
  • Ability to create fillable PDF forms

In-app purchases

None

ChmPlus Lite

No in-app purchases

9 purchases

PDF Expert

Subscriptions8
  • PDF Expert Premium Trial7 Days trial$9.991 Month
  • PDF Expert Premium No Trial$9.991 Month
  • PDF Expert for Education7 Days trial$39.991 Year
Show 5 more
  • PDF Expert Premium7 Days trial2 variants$49.991 Year
  • PDF Expert Premium New7 Days trial$49.991 Year
  • PDF Expert Premium Existing7 Days trial$49.991 Year
  • PDF Expert – Premium Editing1 Year trial$49.991 Year
  • PDF Expert Mac & iOS7 Days trial$79.991 Year
One-time1
  • PDF Expert Basic$9.99

Questions

Is ChmPlus Lite free?
ChmPlus Lite is free to download, with no in-app purchases.
Is PDF Expert free?
PDF Expert is free to download, with in-app purchases available.
Which has better reviews, ChmPlus Lite or PDF Expert?
PDF Expert is rated higher. ChmPlus Lite averages 3.6 out of 5 from 11 ratings, while PDF Expert averages 4.7 from 217K ratings.
Do ChmPlus Lite or PDF Expert have ads?
ChmPlus Lite shows ads; PDF Expert does not.
Which is updated more often, ChmPlus Lite or PDF Expert?
ChmPlus Lite ships an update monthly, and PDF Expert fortnightly. Most recently, ChmPlus Lite was updated on November 1, 2026 and PDF Expert on November 6, 2026.

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