Subitize This! vs book4kids
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Subitize This!
This app helps young children aged 4-7 develop their subitizing skills by practicing recognizing quantities from 1 to 5. It offers options for showing patterns in sets of 4, 6, or 8, with a timer and feedback for responses.
- Subitizing practice 1-5 elements
- Options for sets of 4, 6, or 8
- Includes a timer
- Provides feedback on responses
- Designed for ages 4-7
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Subtilize This! v1.0.0 Designed simply for 4-7 year olds to practice subitizing 1 to 5 elements. • Options include showing patterns in sets of 4, 6 or 8 and setting a timer. Feedback is provided for correct and incorrect responses.
book4kids
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Book4kids is an app designed to develop a love of writing and reading, starting in preschool. It allows younger children to try their hand at writing and/or record their voice for each page. Older children can write, add to, enrich, and modify the text. They become active authors and develop their creativity, bringing their imaginations to life with editable drawings and photos. The created books can be viewed like physical books within the app, or as PDFs or videos if they wish to share them. Complete security is guaranteed: no advertising, no internet access, and no data collection or sharing. Additional information: Licence EULA: https://evalmater.wixsite.com/my-site-1/about-3-1 Privacy Policy: https://evalmater.wixsite.com/my-site-1/about-3-1
Screenshots
Verdict
The clearest difference is in-app purchases: Subitize This! at none against book4kids's 2. Subitize This! also leads on iOS requirement (10.0 vs 17.0). book4kids's advantage is update cadence (every 3 weeks vs every 7 months). On price, ads 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
Both are free to download. book4kids sells 2 in-app purchases, starting at $0.49 per month. Subitize This! asks for nothing beyond the download.
Subitize This! ships an update every 7 months, book4kids every 3 weeks. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.
| Parameter | Subitize This! | book4kids |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 7 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 36 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Classroom Focused Software | Benjamin TATI |
In-app purchases
Subitize This!
No in-app purchases
book4kids
- Book4kids monthly subscription$0.491 Month
- Book4kids annual subscription$1.001 Year
Questions
Is Subitize This! free?
Is book4kids free?
Do Subitize This! or book4kids have ads?
Which is updated more often, Subitize This! or book4kids?
Other comparisons
