# シンプルFLASH暗算 vs 脳内そろばん

The clearest difference is in-app purchases: シンプルFLASH暗算 at none against 脳内そろばん's 1. シンプルFLASH暗算 also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.0). 脳内そろばん's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. 脳内そろばん sells 1 one-off in-app purchase. シンプルFLASH暗算 asks for nothing beyond the download.

シンプルFLASH暗算 ships an update fortnightly, 脳内そろばん monthly. The most recent releases landed on October 18, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | シンプルFLASH暗算 | 脳内そろばん |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Monthly |
| Size | 4 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TSUKASA YONAHA](https://appshunter.io/developer/1835823966) | [Ryo Sato](https://appshunter.io/developer/1831657696) |

## What reviewers say

### シンプルFLASH暗算

[App page](https://appshunter.io/ios/app/flash/id6751562239)

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

**In-app purchases:** none


### 脳内そろばん

[App page](https://appshunter.io/ios/app/id6790279857)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $3.99 | one-time |


## Frequently asked questions

### Is シンプルFLASH暗算 free?

シンプルFLASH暗算 is free to download, with no in-app purchases.

### Is 脳内そろばん free?

脳内そろばん is free to download, with in-app purchases available.

### Do シンプルFLASH暗算 or 脳内そろばん have ads?

シンプルFLASH暗算 shows ads; 脳内そろばん does not.

### Which is updated more often, シンプルFLASH暗算 or 脳内そろばん?

シンプルFLASH暗算 ships an update fortnightly, and 脳内そろばん monthly. Most recently, シンプルFLASH暗算 was updated on October 18, 2026 and 脳内そろばん on October 23, 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.*