# Bio vs 脳内そろばん

The clearest difference is in-app purchases: Bio at none against 脳内そろばん's 1. 脳内そろばん's advantage is update cadence (monthly vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Bio ships an update every 6 months, 脳内そろばん monthly. The most recent releases landed on October 15, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Bio | 脳内そろばん |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Size | 40 MB | 5 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shun Okamoto](https://appshunter.io/developer/1838379045) | [Ryo Sato](https://appshunter.io/developer/1831657696) |

## What reviewers say

### Bio

[App page](https://appshunter.io/ios/app/bio/id6757346102)

**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 Bio free?

Bio 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 Bio or 脳内そろばん have ads?

Neither Bio nor 脳内そろばん shows ads.

### Which is updated more often, Bio or 脳内そろばん?

Bio ships an update every 6 months, and 脳内そろばん monthly. Most recently, Bio was updated on October 15, 2026 and 脳内そろばん on October 28, 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.*