# Book Creator vs Rock

The clearest difference is review sentiment: Rock at 86% against Book Creator's 0%. Rock also leads on monetization model (free with in-app purchases vs subscription) and rating (4.4 vs 4.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Book Creator sells 8 in-app purchases, starting at $4.99 per 7 days and Rock sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Rock holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 27 and 65 respectively. Written reviews point the same way: 0% of Book Creator's written reviews are positive against 86% of Rock's.

Book Creator ships an update every 5 weeks, Rock every 3 weeks. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Book Creator | Rock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (27 ratings)](https://appshunter.io/ios/app/book-creator-write-a-book/id6470928496/reviews) | **[4.4 (65 ratings)](https://appshunter.io/ios/app/rock-scan/id6498787560/reviews)** |
| Number of ratings | 27 | **65** |
| Positive reviews | 0.0% of reviews | **85.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 68 MB | 87 MB |
| Requires iOS | 17.2 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Kaan Yildiz](https://appshunter.io/developer/1473960483) | [Dovran Muhammetrustemov](https://appshunter.io/developer/1741797293) |

## What reviewers say

### Book Creator

[App page](https://appshunter.io/ios/app/book-creator-write-a-book/id6470928496)

This AI-powered writing assistant offers comprehensive support for all your writing needs, from generating creative stories to drafting complex articles. It leverages advanced AI chat engines to provide guidance and assistance at every stage of the writing process.

**Highlights:** AI-powered writing engine, Assistance in every writing step, Handles diverse input types, Generates creative stories, Drafts articles on complex topics, Provides recommendations and advice

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Writer's AI Weekly | $4.99 | per 7 days |
| Writer's AI Weekly | $6.99 | per 7 days |
| Writer's AI Weekly | $7.99 | per 7 days |
| AI Writer Annual Final | $29.99 | per year |
| AI Writer Annual Return | $34.99 | per year |
| Writer's AI Annually | $39.99 | per year |
| Writer's AI Annually | $44.99 | per year |
| Writer's AI Lifetime | $99.99 | one-time |


### Rock

[App page](https://appshunter.io/ios/app/rock-scan/id6498787560)

This application allows users to scan and identify rocks and minerals directly from their mobile device. It provides a convenient way to learn about geological samples encountered in everyday life.

**Highlights:** Scan rocks and minerals, Identify geological samples, Mobile identification tool, Learn about rock types

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Access Rock-Scan pro weekly | $3.99 | per 7 days |
| Access Rock-Scan pro monthly | $9.99 | per month |
| Access Rock-Scan pro yearly | $59.99 | per year |

**What reviewers like**

- 👍 User-friendly interface
- 🚀 Fast identification
- 💡 Educational content
- 💎 Accurate rock identification
- ✨ Identifies non-rocks

**What reviewers complain about**

- 🐛 Inaccurate information
- 🐛 App doesn't work after update
- 🐛 Identified as pastry/cake/metal/charcoal/pottery
- 🐛 Cannot identify common rocks
- 🐛 Identified as not a rock or mineral

**Reported bugs**

- App doesn't work after update
- Failed to connect
- Identified as not a rock or mineral
- Cannot identify common rocks
- Inaccurate identification of some rocks


## Frequently asked questions

### Is Book Creator free?

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

### Is Rock free?

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

### Which has better reviews, Book Creator or Rock?

Rock is rated higher. Book Creator averages 4.0 out of 5 from 27 ratings, while Rock averages 4.4 from 65 ratings.

### Do Book Creator or Rock have ads?

Neither Book Creator nor Rock shows ads.

### Which is updated more often, Book Creator or Rock?

Book Creator ships an update every 5 weeks, and Rock every 3 weeks. Most recently, Book Creator was updated on November 7, 2026 and Rock 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.*