# CAT eBook Viewer vs BZF

The clearest difference is in-app purchases: CAT eBook Viewer at none against BZF's 1. CAT eBook Viewer also leads on iOS requirement (7.0 vs 13.4). BZF's advantage is update cadence (every 2 weeks vs every 5 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. BZF sells 1 one-off in-app purchase. CAT eBook Viewer asks for nothing beyond the download.

CAT eBook Viewer ships an update every 5 months, BZF every 2 weeks. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CAT eBook Viewer | BZF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/cat-ebook-viewer/id448922100/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 36 MB | 34 MB |
| Requires iOS | **7.0** | 13.4 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [CAT Civil Aviation Training](https://appshunter.io/developer/448922103) | [Telmo Dias](https://appshunter.io/developer/524383293) |

## What reviewers say

### CAT eBook Viewer

[App page](https://appshunter.io/ios/app/cat-ebook-viewer/id448922100)

Access customized aviation training materials for JAR/EASA pilot licenses. View content for aeroplanes and helicopters, including PPL, IR, CPL, and ATPL.

**Highlights:** View customized teaching material, JAR/EASA PPL, IR, CPL, ATPL content, Aeroplane and Helicopter modules, Civil Aviation Training material

**In-app purchases:** none


### BZF

[App page](https://appshunter.io/ios/app/bzf/id6478834646)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Full Version | $17.99 | one-time |


## Frequently asked questions

### Is CAT eBook Viewer free?

CAT eBook Viewer is free to download, with no in-app purchases.

### Is BZF free?

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

### Do CAT eBook Viewer or BZF have ads?

Neither CAT eBook Viewer nor BZF shows ads.

### Which is updated more often, CAT eBook Viewer or BZF?

CAT eBook Viewer ships an update every 5 months, and BZF every 2 weeks. Most recently, CAT eBook Viewer was updated on October 10, 2026 and BZF on October 7, 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.*