# Book Builder vs Grade 9 Math Mastery

The clearest difference is price: Grade 9 Math Mastery at Free against Book Builder's $7.99. Book Builder's advantage is in-app purchases (none vs 2) and update cadence (every 5 weeks vs every 5 months). On ads, device support and iOS requirement there is nothing between them.

Grade 9 Math Mastery is free to download; Book Builder costs $7.99 up front. Grade 9 Math Mastery sells 2 in-app purchases, starting at $4.99 per month. Book Builder asks for nothing beyond the download.

Book Builder ships an update every 5 weeks, Grade 9 Math Mastery every 5 months. The most recent releases landed on August 21, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Book Builder | Grade 9 Math Mastery |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.8 (13 ratings)](https://appshunter.io/ios/app/book-builder-school-edition/id6463655799/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | Paid | — |
| Size | 173 MB | 7 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Polished Play, LLC](https://appshunter.io/developer/332686547) | [Eager.app](https://appshunter.io/developer/1550371160) |

## What reviewers say

### Book Builder

[App page](https://appshunter.io/ios/app/book-builder-school-edition/id6463655799)

Empower children to become authors by creating their own digital books. This app provides characters, backgrounds, and text tools to help kids craft unique stories. Finished books can be read digitally or printed at home, fostering creativity and learning.

**Highlights:** Create custom storybooks, Add text with easy-to-use options, Use provided characters and backgrounds, Incorporate personal photos, Read books digitally, Print books at home

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

**In-app purchases:** none


### Grade 9 Math Mastery

[App page](https://appshunter.io/ios/app/grade-9-math-mastery/id6760619466)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grade 9 Math Mastery — Monthly | $4.99 | per month |
| Grade 9 Math Mastery — Annual | $29.99 | per year |


## Frequently asked questions

### Is Book Builder free?

Book Builder costs $7.99, with no in-app purchases.

### Is Grade 9 Math Mastery free?

Grade 9 Math Mastery is free to download, with in-app purchases available.

### Do Book Builder or Grade 9 Math Mastery have ads?

Neither Book Builder nor Grade 9 Math Mastery shows ads.

### Which is updated more often, Book Builder or Grade 9 Math Mastery?

Book Builder ships an update every 5 weeks, and Grade 9 Math Mastery every 5 months. Most recently, Book Builder was updated on August 21, 2026 and Grade 9 Math Mastery on September 10, 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.*