Let's Sum It vs book4kids
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Let's Sum It
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Part of the Indoor Recess Games CFS Bundle Want to have fun practicing math problems with THREE or FOUR addends?! Practice sums to 10.... all Target Sums in this game range from 2 to 10. The goal of the puzzle is to arrange the pieces so that the sum of each horizontal row equals the Target Sum. The current sum for each row is displayed on the far right side of each row in red until it matches the Target Sum... then, it turns green. The catch is you can only slide one piece at a time to the empty square. And, only pieces adjacent to the open square can be moved. The final puzzle piece is displayed below the grid and must be dragged to its correct location as the last move. The last piece must be placed even if it is zero. Adjust the range of Target Sums or play the Challenge mode where the Target Sum is NOT displayed. The TOP 15 Quickest Times are recorded in the app (not game center) when using that mode. Want to play this on your phone? Then, check out the Sum It Climb bundle.
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: Let's Sum It at none against book4kids's 2. Let's Sum It also leads on iOS requirement (10.0 vs 17.0). book4kids's advantage is update cadence (every 3 weeks vs every 3 months). On price, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. book4kids sells 2 in-app purchases, starting at $0.49 per month. Let's Sum It asks for nothing beyond the download.
Let's Sum It ships an update every 3 months, book4kids every 3 weeks. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.
| Parameter | Let's Sum It | book4kids |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 weeks โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPad | iPhone, iPad โ better |
| Requires iOS | 10.0 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 37 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Classroom Focused Software | Benjamin TATI |
In-app purchases
Let's Sum It
No in-app purchases
book4kids
- Book4kids monthly subscription$0.491 Month
- Book4kids annual subscription$1.001 Year









