# 30sAI vs ExternalBrain外脑

The clearest difference is device support: ExternalBrain外脑 at 2 against 30sAI's —. 30sAI's advantage is iOS requirement (11.0 vs 15.0). On price 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.

## The numbers

| Metric | 30sAI | ExternalBrain外脑 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 5 weeks |
| Size | 45 MB | 193 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | — | **iPhone, iPod** |
| Age rating | 17+ | 9+ |
| Developer | [Chengdu Junyi zhufeng Technology Co., LTD](https://appshunter.io/developer/1627063209) | [Shenzhen External Brain Technology Co., Ltd.](https://appshunter.io/developer/1563408639) |

## What reviewers say

### 30sAI

[App page](https://appshunter.io/ios/app/30sai/id6450662075)

**In-app purchases:** none


### ExternalBrain外脑

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 30sAI free?

30sAI is free to download, with no in-app purchases.

### Is ExternalBrain外脑 free?

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

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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.*