# ExternalBrain外脑 vs 四方朋友商家版

The clearest difference is iOS requirement: 四方朋友商家版 at 13 against ExternalBrain外脑's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ExternalBrain外脑 ships an update every 5 weeks, 四方朋友商家版 every 3 weeks. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | ExternalBrain外脑 | 四方朋友商家版 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 193 MB | 116 MB |
| Requires iOS | 15.0 | **13** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen External Brain Technology Co., Ltd.](https://appshunter.io/developer/1563408639) | [湖南旗云科技集团有限公司](https://appshunter.io/developer/1505297631) |

## What reviewers say

### ExternalBrain外脑

[App page](https://appshunter.io/ios/app/externalbrain/id6670423733)

**Features:** macOS Compatibility

**In-app purchases:** none


### 四方朋友商家版

[App page](https://appshunter.io/ios/app/id6743155890)

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

**In-app purchases:** none


## Frequently asked questions

### Is ExternalBrain外脑 free?

ExternalBrain外脑 is free to download, with no in-app purchases.

### Is 四方朋友商家版 free?

四方朋友商家版 is free to download, with no in-app purchases.

### Do ExternalBrain外脑 or 四方朋友商家版 have ads?

Neither ExternalBrain外脑 nor 四方朋友商家版 shows ads.

### Which is updated more often, ExternalBrain外脑 or 四方朋友商家版?

ExternalBrain外脑 ships an update every 5 weeks, and 四方朋友商家版 every 3 weeks. Most recently, ExternalBrain外脑 was updated on October 4, 2026 and 四方朋友商家版 on October 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.*