CAT eBook Viewer vs BZF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CAT eBook Viewer
Access customized aviation training materials for JAR/EASA pilot licenses. View content for aeroplanes and helicopters, including PPL, IR, CPL, and ATPL.
- View customized teaching material
- JAR/EASA PPL, IR, CPL, ATPL content
- Aeroplane and Helicopter modules
- Civil Aviation Training material
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Customers and students aof CAT Europe (Civil Aviation Training) can view their customized teaching material with this app. JAR/EASA PPL, IR, CPL, ATPL. Aeroplanes and Helicopter.
BZF
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This app features not only the official questions from Bundesnetzagentur, but also several pages of theory materials summarized, to help you learn and understand fundamental concepts needed for your success in aviation and of course on the BZF exam. Learn and practice for the exam on the same app, while tracking your progress on each question individually. - Multilingual App and content - In-App theoretical training materials - Advanced question study interface, allowing random order and seeing only the correct answer for better memorization - Realistic exam mode, but with pause function in case you need a coffee break - Individual question statistics - No internet connection needed Limited number of questions and study materials in Trial Version. Upgrade to Full Version with a single, one-time, in-App purchase.
Screenshots
Verdict
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.
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. 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.
| Parameter | CAT eBook Viewer | BZF |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 36 MB | 34 MB |
| Age rating | 4+ | 17+ |
| Developer | CAT Civil Aviation Training | Telmo Dias |
In-app purchases
CAT eBook Viewer
No in-app purchases
BZF
- Upgrade to Full Version$17.99
Questions
Is CAT eBook Viewer free?
Is BZF free?
Do CAT eBook Viewer or BZF have ads?
Which is updated more often, CAT eBook Viewer or BZF?
Other comparisons
