# 心流AI助手 vs BookSide

The clearest difference is in-app purchases: 心流AI助手 at none against BookSide's 3. 心流AI助手 also leads on iOS requirement (15.1 vs 17.0). BookSide's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. BookSide sells 3 in-app purchases, starting at $3.99 per month. 心流AI助手 asks for nothing beyond the download.

心流AI助手 ships an update every 3 weeks, BookSide every 2 days. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 心流AI助手 | BookSide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/ai/id6639605975/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 165 MB | 21 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Hangzhou Xingchen Qianxun Technology Co., Ltd](https://appshunter.io/developer/1597679171) | [杭州引力网络技术有限公司](https://appshunter.io/developer/1133518651) |

## What reviewers say

### 心流AI助手

[App page](https://appshunter.io/ios/app/ai/id6639605975)

This AI assistant enhances productivity for research, academics, and professionals by offering intelligent search, document analysis, and content creation support. It helps users quickly find information, summarize documents, and generate creative content for various tasks.

**Highlights:** Intelligent real-time web search, Document and webpage parsing, Content summarization and translation, Assisted content creation, Information source citation

**In-app purchases:** none


### BookSide

[App page](https://appshunter.io/ios/app/bookside/id6780348495)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly VIP | $3.99 | per month |
| Yearly VIP | $39.99 | per year |
| VIP Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is 心流AI助手 free?

心流AI助手 is free to download, with no in-app purchases.

### Is BookSide free?

BookSide is free to download, with in-app purchases available.

### Do 心流AI助手 or BookSide have ads?

Neither 心流AI助手 nor BookSide shows ads.

### Which is updated more often, 心流AI助手 or BookSide?

心流AI助手 ships an update every 3 weeks, and BookSide every 2 days. Most recently, 心流AI助手 was updated on September 30, 2026 and BookSide 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.*