# CAT eBook Viewer vs BZF

The clearest difference is rating: BZF at 5.0 against CAT eBook Viewer's 1.0. BZF also leads on review sentiment (83% vs 46%) and device support (3 vs 1). CAT eBook Viewer's advantage is in-app purchases (none vs 3) and update cadence (every 5 months vs every 12 months). On price, ratings volume and ads there is nothing between them.

Both are free to download. BZF sells 3 in-app purchases, starting at $3.99 per month. CAT eBook Viewer asks for nothing beyond the download.

BZF holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 46% of CAT eBook Viewer's written reviews are positive against 83% of BZF's.

CAT eBook Viewer ships an update every 5 months, BZF every 12 months. The most recent releases landed on November 1, 2026 and November 4, 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) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bzf-flugfunkprufung/id1538334549/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 46.2% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 12 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 36 MB | 51 MB |
| Requires iOS | **7.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CAT Civil Aviation Training](https://appshunter.io/developer/448922103) | [TuesdayCoding GmbH](https://appshunter.io/developer/1644378329) |

## 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-flugfunkprufung/id1538334549)

Prepare for your BZF radio telephony license exam with this comprehensive study tool. Access official exam questions, explanations, and practice tests. Study offline and track your progress with a smart learning system.

**Highlights:** Official exam questions and answers, Explanations for every question, Offline usability, Practice exam simulations, Progress tracking with traffic light system, Multiple-choice format

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Monat - Alle Funktionen | $3.99 | per month |
| 1 Jahr - Alle Funktionen | $7.99 | per year |
| Lifetime subscription | $12.99 | 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.

### Which has better reviews, CAT eBook Viewer or BZF?

BZF is rated higher. CAT eBook Viewer averages 1.0 out of 5 from 1 ratings, while BZF averages 5.0 from 1 ratings.

### 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 12 months. Most recently, CAT eBook Viewer was updated on November 1, 2026 and BZF on November 4, 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.*