# AI教师助手 vs ExternalBrain外脑

The clearest difference is in-app purchases: ExternalBrain外脑 at none against AI教师助手's 1. AI教师助手's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AI教师助手 sells 1 one-off in-app purchase. ExternalBrain外脑 asks for nothing beyond the download.

AI教师助手 ships an update every 3 weeks, ExternalBrain外脑 every 5 weeks. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AI教师助手 | ExternalBrain外脑 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Size | 40 MB | 193 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 9+ |
| Developer | [Beijing Waiyan Online Digital Technology Co., Ltd.](https://appshunter.io/developer/1469175726) | [Shenzhen External Brain Technology Co., Ltd.](https://appshunter.io/developer/1563408639) |

## What reviewers say

### AI教师助手

[App page](https://appshunter.io/ios/app/ai/id6499516346)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI教师助手月度会员 | $14.99 | one-time |


### ExternalBrain外脑

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AI教师助手 free?

AI教师助手 is free to download, with in-app purchases available.

### Is ExternalBrain外脑 free?

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

### Do AI教师助手 or ExternalBrain外脑 have ads?

Neither AI教师助手 nor ExternalBrain外脑 shows ads.

### Which is updated more often, AI教师助手 or ExternalBrain外脑?

AI教师助手 ships an update every 3 weeks, and ExternalBrain外脑 every 5 weeks. Most recently, AI教师助手 was updated on September 25, 2026 and ExternalBrain外脑 on September 17, 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.*