# Math Galaxy 8th Grade Math vs Mental Abacus Book 3

The clearest difference is price: Mental Abacus Book 3 at $8.99 against Math Galaxy 8th Grade Math's $12.99. Mental Abacus Book 3 also leads on iOS requirement (8.0 vs 12.0). Math Galaxy 8th Grade Math's advantage is update cadence (every 7 months vs every 20 months). On ads, in-app purchases and device support there is nothing between them.

Math Galaxy 8th Grade Math costs $12.99 and Mental Abacus Book 3 $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Math Galaxy 8th Grade Math ships an update every 7 months, Mental Abacus Book 3 every 20 months. The most recent releases landed on May 17, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Math Galaxy 8th Grade Math | Mental Abacus Book 3 |
| --- | --- | --- |
| Price | $12.99 | **$8.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 20 months |
| Size | 542 MB | 13 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gilbert Reilly](https://appshunter.io/developer/500490521) | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) |

## What reviewers say

### Math Galaxy 8th Grade Math

[App page](https://appshunter.io/ios/app/math-galaxy-8th-grade-math/id998383044)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Abacus Book 3

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Math Galaxy 8th Grade Math free?

Math Galaxy 8th Grade Math costs $12.99, with no in-app purchases.

### Is Mental Abacus Book 3 free?

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

### Do Math Galaxy 8th Grade Math or Mental Abacus Book 3 have ads?

Neither Math Galaxy 8th Grade Math nor Mental Abacus Book 3 shows ads.

### Which is updated more often, Math Galaxy 8th Grade Math or Mental Abacus Book 3?

Math Galaxy 8th Grade Math ships an update every 7 months, and Mental Abacus Book 3 every 20 months. Most recently, Math Galaxy 8th Grade Math was updated on May 17, 2026 and Mental Abacus Book 3 on September 14, 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.*