# Tri This Math vs book4kids

The clearest difference is in-app purchases: Tri This Math at none against book4kids's 2. Tri This Math 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.

Both are free to download. book4kids sells 2 in-app purchases, starting at $0.49 per month. Tri This Math asks for nothing beyond the download.

Tri This Math ships an update every 3 months, book4kids every 3 weeks. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Tri This Math | book4kids |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 36 MB | 20 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Classroom Focused Software](https://appshunter.io/developer/406741679) | [Benjamin TATI](https://appshunter.io/developer/1583386758) |

## What reviewers say

### Tri This Math

[App page](https://appshunter.io/ios/app/tri-this-math/id1406150893)

**Features:** macOS Compatibility

**In-app purchases:** none


### book4kids

[App page](https://appshunter.io/ios/app/book4kids/id1587601959)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Book4kids monthly subscription | $0.49 | per month |
| Book4kids annual subscription | $1.00 | per year |


## Frequently asked questions

### Is Tri This Math free?

Tri This Math is free to download, with no in-app purchases.

### Is book4kids free?

book4kids is free to download, with in-app purchases available.

### Do Tri This Math or book4kids have ads?

Neither Tri This Math nor book4kids shows ads.

### Which is updated more often, Tri This Math or book4kids?

Tri This Math ships an update every 3 months, and book4kids every 3 weeks. Most recently, Tri This Math was updated on October 6, 2026 and book4kids on October 17, 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.*