# 巡查卫士 vs 船检知库

The clearest difference is ads: 巡查卫士 at none against 船检知库's shown. 巡查卫士 also leads on update cadence (monthly vs every 5 months). 船检知库's advantage is iOS requirement (9.0 vs 13.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

巡查卫士 ships an update monthly, 船检知库 every 5 months. The most recent releases landed on October 27, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 巡查卫士 | 船检知库 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 5 months |
| Size | 55 MB | 28 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jiangsu JinHaiXing Navigation Technology Co., Ltd.](https://appshunter.io/developer/1298491670) | [中国船级社](https://appshunter.io/developer/987806956) |

## What reviewers say

### 巡查卫士

[App page](https://appshunter.io/ios/app/id1597213987)

**Features:** macOS Compatibility

**In-app purchases:** none


### 船检知库

[App page](https://appshunter.io/ios/app/id1636635147)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 巡查卫士 free?

巡查卫士 is free to download, with no in-app purchases.

### Is 船检知库 free?

船检知库 is free to download, with no in-app purchases.

### Do 巡查卫士 or 船检知库 have ads?

船检知库 shows ads; 巡查卫士 does not.

### Which is updated more often, 巡查卫士 or 船检知库?

巡查卫士 ships an update monthly, and 船检知库 every 5 months. Most recently, 巡查卫士 was updated on October 27, 2026 and 船检知库 on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*