# Mental Math Kingdom vs Abacus Trainer

The clearest difference is in-app purchases: Abacus Trainer at none against Mental Math Kingdom's 1. Abacus Trainer also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). Mental Math Kingdom's advantage is ads (none vs shown) and update cadence (daily vs every 10 days). On price there is nothing between them.

Both are free to download. Mental Math Kingdom sells 1 one-off in-app purchase. Abacus Trainer asks for nothing beyond the download.

Mental Math Kingdom ships an update daily, Abacus Trainer every 10 days. The most recent releases landed on August 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Mental Math Kingdom | Abacus Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 10 days |
| Size | 13 MB | 26 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Hiroki Sekimoto](https://appshunter.io/developer/1877884860) | [Doni Winata](https://appshunter.io/developer/6794313295) |

## What reviewers say

### Mental Math Kingdom

[App page](https://appshunter.io/ios/app/mental-math-kingdom/id6787438808)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mental Math Kingdom Pro | $3.99 | one-time |


### Abacus Trainer

[App page](https://appshunter.io/ios/app/abacus-trainer-mental-math/id6794313293)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math Kingdom free?

Mental Math Kingdom is free to download, with in-app purchases available.

### Is Abacus Trainer free?

Abacus Trainer is free to download, with no in-app purchases.

### Do Mental Math Kingdom or Abacus Trainer have ads?

Abacus Trainer shows ads; Mental Math Kingdom does not.

### Which is updated more often, Mental Math Kingdom or Abacus Trainer?

Mental Math Kingdom ships an update daily, and Abacus Trainer every 10 days. Most recently, Mental Math Kingdom was updated on August 17, 2026 and Abacus Trainer on September 9, 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.*