# Calculation Training For Brain vs 素数チャレンジ！

The clearest difference is update cadence: 素数チャレンジ！ at every 6 days against Calculation Training For Brain's every 5 months. Calculation Training For Brain's advantage is iOS requirement (15.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Calculation Training For Brain sells 1 one-off in-app purchase and 素数チャレンジ！ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Calculation Training For Brain ships an update every 5 months, 素数チャレンジ！ every 6 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Calculation Training For Brain | 素数チャレンジ！ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/calculation-training-for-brain/id1159243202/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 86.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 97 MB | 6 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masaki Kanno](https://appshunter.io/developer/843112443) | [Kenji Yanase](https://appshunter.io/developer/1865920313) |

## What reviewers say

### Calculation Training For Brain

[App page](https://appshunter.io/ios/app/calculation-training-for-brain/id1159243202)

Practice basic math calculations with this engaging app designed for all ages. Improve mental math skills through fun, game-like exercises. Choose your difficulty, duration, and calculation type for daily brain training.

**Highlights:** Basic math calculation practice, Suitable for all ages, Game-like engagement, Customizable difficulty, duration, and calculation type, Addition, subtraction, multiplication, division, and mixed operations

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $5.99 | one-time |


### 素数チャレンジ！

[App page](https://appshunter.io/ios/app/id6767792008)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム機能 | $0.99 | one-time |


## Frequently asked questions

### Is Calculation Training For Brain free?

Calculation Training For Brain is free to download, with in-app purchases available.

### Is 素数チャレンジ！ free?

素数チャレンジ！ is free to download, with in-app purchases available.

### Do Calculation Training For Brain or 素数チャレンジ！ have ads?

Both Calculation Training For Brain and 素数チャレンジ！ show ads.

### Which is updated more often, Calculation Training For Brain or 素数チャレンジ！?

Calculation Training For Brain ships an update every 5 months, and 素数チャレンジ！ every 6 days. Most recently, Calculation Training For Brain was updated on November 2, 2026 and 素数チャレンジ！ on November 5, 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.*