# 百思文库 vs 写作助手

The clearest difference is device support: 写作助手 at 2 against 百思文库's —. 百思文库's advantage is iOS requirement (12.0 vs 15.0). On price and in-app purchases there is nothing between them.

Both are free to download. 百思文库 sells 3 in-app purchases, starting at $2.99 per 7 days and 写作助手 sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 百思文库 | 写作助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 4 months |
| Size | 16 MB | 45 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | — | **iPhone, iPod** |
| Age rating | 17+ | 9+ |
| Developer | [敏飞 任](https://appshunter.io/developer/1733484219) | [应夏 陈](https://appshunter.io/developer/1842122745) |

## What reviewers say

### 百思文库

[App page](https://appshunter.io/ios/app/ai/id6502648145)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 高级会员 | $2.99 | per 7 days |
| 高级会员 | $3.99 | per month |
| 高级会员 | $24.99 | per year |


### 写作助手

[App page](https://appshunter.io/ios/app/ai/id6756476932)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员 | $4.99 | per 7 days |
| 月会员 | $5.99 | one-time |
| 年会员 | $14.99 | one-time |


## Frequently asked questions

### Is 百思文库 free?

百思文库 is free to download, with in-app purchases available.

### Is 写作助手 free?

写作助手 is free to download, with in-app purchases available.

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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.*