Kidz vs Book Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kidz
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.
- Addition and multiplication practice
- Adjustable difficulty levels (easy, medium, hard)
- Interactive gameplay with numbered balls
- Targeted math problem solving
- Default operation setting
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'Kidz Knockout Operations' is a fun way of learning math operations - addition and multiplication. The game will ask the player to choose from two operations - Addition or Multiplication. If nothing is chosen by the player, the game sets the default operation to 'Addition'. With Addition, the player has to hit the numbered balls to make a sum equivalent to the monster's number. As the game progresses from 'easy', 'medium', and 'hard' levels, the numbered balls increase. For the easy level, the balls are numbered from 1 - 9; the balls in the medium level are numbered in the range 10 - 15. The balls in the hard level are numbered in the range 15 - 20. In Multiplication, the player's goal is to hit the numbered balls to make a product equivalent to the monster's number. In both math operations, the player cannot hit the numbered ball, which is the same as the monster's number. Happy playing :-)
Book Builder
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.
- 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
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Become an author! Puppet Pals Book Builder empowers a child to create beautiful creative content. Characters and backgrounds are provided. Even add your own photos! Get started by adding text with many easy-to-use options. When you're done creating, read your book or print it out at home! Encourage life long learning and creativity!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 September 2, 2026 and August 21, 2026 respectively.
| Parameter | Kidz | Book Builder |
|---|---|---|
| Price | $1.99 — better | $7.99 |
| Rating | 5.0 (1 ratings) — better | 4.8 (13 ratings) |
| Positive reviews | — | 87.5% of reviews |
| Number of ratings | 1 | 13 — better |
| Update frequency | Every 38 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 173 MB |
| Age rating | 4+ | 4+ |
| Developer | Gomathy Shankaran | Polished Play, LLC |
Customer experience
Kidz
Book Builder
In-app purchases
Kidz
No in-app purchases
Book Builder
No in-app purchases
