PDF Reader vs CHM Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
CHM Reader
This app provides a streamlined and efficient way to read CHM and TXT documents. It offers features like smart table of contents navigation, full-text search, adjustable font sizes, and night mode for a comfortable reading experience.
- Professional CHM format support
- Smart Table of Contents navigation
- Full-text search
- Adjustable font size
- Night mode
- Bookmark collection
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CHM Reader & Viewer - Professional CHM Document Reader A streamlined and efficient CHM document reader that provides you with a smooth and comfortable reading experience. Key Features: • Professional CHM Format Support - Perfect compatibility with various CHM documents, supporting multiple encoding formats • Smart Table of Contents Navigation - One-tap jump, quick content positioning • Powerful Search Function - Full-text search, instantly find the information you need • Personalized Reading - Font size adjustment, night mode • Bookmark Collection - Save important sections, offline access Designed specifically for efficient reading, making your document browsing more convenient. How to Use: After opening the app, click "+" to add CHM files and start reading. Encoding Support: Built-in encoding format toggle button in the reader menu, supports GBK, UTF-8 and other encodings, easily solve garbled text issues. Subscription Options: • Offers weekly and annual memberships, lifetime membership • Payment will be charged to your iTunes account • Auto-renewal occurs within 24 hours before subscription expires • Manage or cancel subscriptions anytime in account settings Designed specifically for efficient reading, making your document browsing more convenient. Terms of Service: https://chmreader.xzonesoft.com/terms.html Privacy Policy: https://chmreader.xzonesoft.com/privacy.html Contact Us: support@xzonesoft.com
Screenshots
Verdict
PDF Reader and CHM Reader both sit at 4.9 stars, but that hides the real split: 71% of PDF Reader's written reviews are positive against 43% of CHM Reader's. PDF Reader also leads on ratings volume (8 vs 2) and iOS requirement (12.0 vs 16). On price, rating, update cadence and ads 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
Both are free to download. PDF Reader sells 5 one-off in-app purchases and CHM Reader sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.9 for PDF Reader against 5.0 for CHM Reader. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews are what separate them: 71% of PDF Reader's written reviews are positive against 43% of CHM Reader's.
Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on October 8, 2026.
| Parameter | PDF Reader | CHM Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (8 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 71.4% of reviews — better | 42.9% of reviews |
| Number of ratings | 8 — better | 2 |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 16 |
| Further details — not scored | ||
| Size | 50 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | 绪强 任 | 灿耿 陈 |
Customer experience
PDF Reader
CHM Reader
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
CHM Reader
- Weekly members$1.997 Days
- Annual Subscription$4.991 Year
- Lifetime Membership$6.99
