# Mental Abacus Book 3 vs Mathmaji

The clearest difference is price: Mathmaji at Free against Mental Abacus Book 3's $8.99. Mathmaji also leads on update cadence (weekly vs every 20 months). Mental Abacus Book 3's advantage is in-app purchases (none vs 2) and iOS requirement (8.0 vs 14.0). On ads and device support there is nothing between them.

Mathmaji is free to download; Mental Abacus Book 3 costs $8.99 up front. Mathmaji sells 2 in-app purchases, starting at $15.00 per month. Mental Abacus Book 3 asks for nothing beyond the download.

Mental Abacus Book 3 ships an update every 20 months, Mathmaji weekly. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Mental Abacus Book 3 | Mathmaji |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | — | **[4.1 (9 ratings)](https://appshunter.io/ios/app/mathmaji/id6469683426/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 13 MB | 82 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) | [Mathmaji Co., Ltd.](https://appshunter.io/developer/1712282132) |

## What reviewers say

### Mental Abacus Book 3

[App page](https://appshunter.io/ios/app/mental-abacus-book-3/id1054868136)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Mathmaji

[App page](https://appshunter.io/ios/app/mathmaji/id6469683426)

This app offers a K-5 math curriculum using the Japanese method of structured problem-solving. It features over 500 exercises designed to build confidence, comprehension, and mental calculation skills. Track progress with a comprehensive learning management system.

**Highlights:** K-5 numerical math curriculum, 500+ engaging exercises, Japanese instruction techniques, Tailored lessons and games, Comprehensive Learning Management System, Boosts confidence and comprehension

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly(1 Month) | $15.00 | per month |
| Plus Annual (1 Year) | $124.99 | per year |


## Frequently asked questions

### Is Mental Abacus Book 3 free?

Mental Abacus Book 3 costs $8.99, with no in-app purchases.

### Is Mathmaji free?

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

### Do Mental Abacus Book 3 or Mathmaji have ads?

Neither Mental Abacus Book 3 nor Mathmaji shows ads.

### Which is updated more often, Mental Abacus Book 3 or Mathmaji?

Mental Abacus Book 3 ships an update every 20 months, and Mathmaji weekly. Most recently, Mental Abacus Book 3 was updated on October 26, 2026 and Mathmaji on October 30, 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.*