# CHMate vs Audi Scan

The clearest difference is in-app purchases: Audi Scan at none against CHMate's 1. Audi Scan also leads on iOS requirement (12.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CHMate sells 1 one-off in-app purchase. Audi Scan asks for nothing beyond the download.

CHMate ships an update every 2 weeks, Audi Scan monthly. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CHMate | Audi Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (20 ratings)](https://appshunter.io/ios/app/chmate-epub-and-chm-reader/id335157929/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 55.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 94 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [贤安 陈](https://appshunter.io/developer/318015371) | [Volkswagen Group France](https://appshunter.io/developer/403752726) |

## What reviewers say

### CHMate

[App page](https://appshunter.io/ios/app/chmate-epub-and-chm-reader/id335157929)

This app offers a robust reading experience for EPUB and CHM eBooks. Organize your library, add bookmarks and notes, and customize your reading environment. Share passages and easily search within your books.

**Highlights:** Organize eBooks into collections, Add bookmarks and notes, Customizable fonts and line height, Fast scrolling and pagination, Highlight favorite passages, Built-in search functionality, Share quotes with friends

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CHMate+ | $9.99 | one-time |

**What reviewers like**

- 👍 Excellent UI/UX design and interface
- 📖 Best CHM file reader available
- ⚡ Fast and smooth performance
- 🎨 Customizable text formatting and fonts
- 🔍 Powerful search functionality

**What reviewers complain about**

- 🐛 Frequent crashes and stability issues
- ⚠️ iCloud sync deletes files irreversibly
- 💰 Expensive pricing for functionality
- 🔄 Highlighting and annotations don't persist
- 📱 Compatibility issues with iOS updates

**Reported bugs**

- App crashes when searching CHM files
- Crashes when using tap-hold for bookmarking
- Highlighting functionality broken after iOS updates
- Notes and bookmarks not saving properly
- Highlights disappear or move between chapters

**Requested features**

- Dark mode and additional color themes (Sepia)
- Book cover display instead of text-only library view
- PDF support
- Text-to-speech functionality
- Better pagination options


### Audi Scan

[App page](https://appshunter.io/ios/app/audi-scan/id1580036841)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CHMate free?

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

### Is Audi Scan free?

Audi Scan is free to download, with no in-app purchases.

### Do CHMate or Audi Scan have ads?

Neither CHMate nor Audi Scan shows ads.

### Which is updated more often, CHMate or Audi Scan?

CHMate ships an update every 2 weeks, and Audi Scan monthly. Most recently, CHMate was updated on October 21, 2026 and Audi Scan on October 11, 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.*