Book vs Causality
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Book
Create publication-ready ePub and PDF files from your manuscripts. Effortlessly transform text into formats suitable for eBook distribution and print-on-demand services. Ideal for fiction authors preparing their work for platforms like Amazon.
- Generates ePub and PDF files
- Assembles publication-ready fiction novels
- Transforms Markdown or plain text manuscripts
- Suitable for eBook distribution
- Supports print-on-demand books
- Directly integrates with Amazon
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This application generates ePub and PDF files. Use it for assembling publication ready fiction novels. Transform manuscripts written in Markdown or plain text to formats suitable for sending eBooks and print-on-demand books directly to Amazon.
Causality
Discover and interact with physical products and locations linked to digital experiences. Use NFC tags to unlock engaging activations that bridge the physical and digital worlds. No account or complex setup required, just tap and explore.
- Discover NFC-tagged products
- Access IRL waypoints
- Engage in digital activations
- Connect physical and digital
- No account creation needed
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This app is your tool for discovering and accessing any Causality-powered experience. Find NFC-tagged products or IRL waypoints from your favorite brands, communities or even your friends, then use them in fascinating and exciting activations where the link between physical and digital can be truly felt. It's all made possible by Causality's patent-pending POPphy methodology (Proof of Possession of Physical Goods). Just follow the instructions, click and tap. No account creation and no hassle.
Screenshots
Verdict
The clearest difference is review sentiment: Causality at 100% against Book's 50%. Causality also leads on rating (5.0 vs 3.0) and in-app purchases (none vs 1). On price, ads, device support and iOS requirement 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. Book sells 1 in-app purchase, starting at $4.99 per year. Causality asks for nothing beyond the download.
Causality holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 50% of Book's written reviews are positive against 100% of Causality's.
Book ships an update every 6 months, Causality fortnightly. Both last shipped on October 12, 2026.
| Parameter | Book | Causality |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 4 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Hexagonal Studios Limited | Clever Guerrilla Inc. |
Customer experience
Book
Causality
In-app purchases
Book
- Book-Binder Subscription$4.991 Year
Causality
No in-app purchases
