# 船检知库 vs 易海通EML

The clearest difference is ads: 易海通EML at none against 船检知库's shown. 易海通EML also leads on update cadence (every 3 weeks 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.

船检知库 ships an update every 5 months, 易海通EML every 3 weeks. The most recent releases landed on September 15, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | 船检知库 | 易海通EML |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 28 MB | 104 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [中国船级社](https://appshunter.io/developer/987806956) | [青岛索尔信息技术服务有限公司](https://appshunter.io/developer/1838903589) |

## What reviewers say

### 船检知库

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

**Features:** macOS Compatibility

**In-app purchases:** none


### 易海通EML

[App page](https://appshunter.io/ios/app/eml/id6752327857)

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

**In-app purchases:** none


## Frequently asked questions

### Is 船检知库 free?

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

### Is 易海通EML free?

易海通EML is free to download, with no in-app purchases.

### Do 船检知库 or 易海通EML have ads?

船检知库 shows ads; 易海通EML does not.

### Which is updated more often, 船检知库 or 易海通EML?

船检知库 ships an update every 5 months, and 易海通EML every 3 weeks. Most recently, 船检知库 was updated on September 15, 2026 and 易海通EML on August 31, 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.*