# PDF Reader vs CHM+

The clearest difference is rating: PDF Reader at 4.9 against CHM+'s 3.0. PDF Reader also leads on ads (none vs shown) and ratings volume (8 vs 2). CHM+'s advantage is review sentiment (83% vs 71%). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. PDF Reader sells 5 one-off in-app purchases and CHM+ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

PDF Reader holds the better App Store score, 4.9 against 3.0. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews complicate that: 71% of PDF Reader's written reviews are positive against 83% of CHM+'s, so the app with the better star average is not the one people write more warmly about.

PDF Reader ships an update every 3 weeks, CHM+ every 6 weeks. The most recent releases landed on September 25, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | PDF Reader | CHM+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (8 ratings)](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/chm-plus-chm-document-reader/id6745147168/reviews) |
| Number of ratings | **8** | 2 |
| Positive reviews | 71.4% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 50 MB | 16 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [绪强 任](https://appshunter.io/developer/898564038) | [俊锋 仝](https://appshunter.io/developer/1209824000) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader App donate | $0.99 | one-time |
| Dropbox Support | $0.99 | one-time |
| Remove Ad | $4.99 | one-time |
| Todo donate | $7.99 | one-time |
| Todo donate | $14.99 | one-time |


### CHM+

[App page](https://appshunter.io/ios/app/chm-plus-chm-document-reader/id6745147168)

This app provides a streamlined way to read CHM documents on iOS devices. It offers quick import from local storage and iCloud, fast opening of large files, and efficient chapter navigation. Enjoy a smooth reading experience with support for multiple encodings.

**Highlights:** Quick document import (local storage, iCloud), Fast opening of large CHM files, Table of contents chapter switching, Multi-screen collaboration on iPad, Support for multiple encoding types, Smooth reading experience

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CHM Pro | $4.99 | one-time |


## Frequently asked questions

### Is PDF Reader free?

PDF Reader is free to download, with in-app purchases available.

### Is CHM+ free?

CHM+ is free to download, with in-app purchases available.

### Which has better reviews, PDF Reader or CHM+?

PDF Reader is rated higher. PDF Reader averages 4.9 out of 5 from 8 ratings, while CHM+ averages 3.0 from 2 ratings.

### Do PDF Reader or CHM+ have ads?

CHM+ shows ads; PDF Reader does not.

### Which is updated more often, PDF Reader or CHM+?

PDF Reader ships an update every 3 weeks, and CHM+ every 6 weeks. Most recently, PDF Reader was updated on September 25, 2026 and CHM+ on September 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*