# Kidz vs Book Builder

The clearest difference is update cadence: Book Builder at every 5 weeks against Kidz's every 38 months. Book Builder also leads on ratings volume (13 vs 1). Kidz's advantage is price ($1.99 vs $7.99) and rating (5.0 vs 4.8). On ads, in-app purchases, monetization model and device support there is nothing between them.

Kidz costs $1.99 and Book Builder $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kidz holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Book Builder has 13 ratings behind it against 1, so its average is the more settled of the two.

Kidz ships an update every 38 months, Book Builder every 5 weeks. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Kidz | Book Builder |
| --- | --- | --- |
| Price | **$1.99** | $7.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kidz-knockout-operations/id1510014095/reviews)** | [4.8 (13 ratings)](https://appshunter.io/ios/app/book-builder-school-edition/id6463655799/reviews) |
| Number of ratings | 1 | **13** |
| Positive reviews | — | 87.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 1 MB | 173 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gomathy Shankaran](https://appshunter.io/developer/503956143) | [Polished Play, LLC](https://appshunter.io/developer/332686547) |

## What reviewers say

### Kidz

[App page](https://appshunter.io/ios/app/kidz-knockout-operations/id1510014095)

Learn addition and multiplication through an engaging game. Solve math problems by hitting numbered balls to match a monster's target number, with increasing difficulty levels. Offers a fun and interactive way to practice essential math skills.

**Highlights:** Addition and multiplication practice, Adjustable difficulty levels (easy, medium, hard), Interactive gameplay with numbered balls, Targeted math problem solving, Default operation setting

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Kidz free?

Kidz costs $1.99, with no in-app purchases.

### Is Book Builder free?

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

### Which has better reviews, Kidz or Book Builder?

Kidz is rated higher. Kidz averages 5.0 out of 5 from 1 ratings, while Book Builder averages 4.8 from 13 ratings.

### Do Kidz or Book Builder have ads?

Neither Kidz nor Book Builder shows ads.

### Which is updated more often, Kidz or Book Builder?

Kidz ships an update every 38 months, and Book Builder every 5 weeks. Most recently, Kidz was updated on October 16, 2026 and Book Builder on October 24, 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.*