# 360点睛 vs RetainBook

The clearest difference is price: 360点睛 at Free against RetainBook's $2.99. 360点睛 also leads on iOS requirement (9.0 vs 13.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

360点睛 is free to download; RetainBook costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 2, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | 360点睛 | RetainBook |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Size | 44 MB | 19 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Qihoo Technology Co Ltd](https://appshunter.io/developer/441216575) | [久燕 王](https://appshunter.io/developer/1896551289) |

## What reviewers say

### 360点睛

[App page](https://appshunter.io/ios/app/360/id1475446307)

**Features:** Vision Pro support

**In-app purchases:** none


### RetainBook

[App page](https://appshunter.io/ios/app/retainbook/id6769669764)

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

**In-app purchases:** none


## Frequently asked questions

### Is 360点睛 free?

360点睛 is free to download, with no in-app purchases.

### Is RetainBook free?

RetainBook costs $2.99, with no in-app purchases.

### Do 360点睛 or RetainBook have ads?

Neither 360点睛 nor RetainBook shows ads.

### Which is updated more often, 360点睛 or RetainBook?

360点睛 ships an update every 6 weeks, and RetainBook every 6 weeks. Most recently, 360点睛 was updated on October 2, 2026 and RetainBook on October 16, 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.*