# ClassNK Directory vs OI Maritime

The clearest difference is update cadence: OI Maritime at every 2 weeks against ClassNK Directory's every 10 months. OI Maritime also leads on iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ClassNK Directory ships an update every 10 months, OI Maritime every 2 weeks. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ClassNK Directory | OI Maritime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/classnk-directory/id956676438/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 15 MB | 62 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [NIPPON KAIJI KYOKAI GENERAL INCORPORATED FOUNDATION](https://appshunter.io/developer/956676437) | [CONSULERE ASM GLOBAL LLP](https://appshunter.io/developer/1687524039) |

## What reviewers say

### ClassNK Directory

[App page](https://appshunter.io/ios/app/classnk-directory/id956676438)

Easily find contact details for a global network of survey offices. Search for locations by port, country, or keywords, and view them on Google Maps.

**Highlights:** Worldwide office network access, Contact information for global offices, Search offices by port, country, or keywords, View office locations on Google Maps, Access staff details

**Features:** macOS Compatibility

**In-app purchases:** none


### OI Maritime

[App page](https://appshunter.io/ios/app/oi-maritime/id6670778632)

This app provides a patented solution for tracking plastic waste on vessels, promoting accountability and environmental stewardship in the maritime industry. It helps reduce pollution from ships by managing waste, raising awareness, and fostering partnerships to protect ocean health.

**Highlights:** Plastic waste tracking on vessels, Promotes accountability and stewardship, Waste generation and disposal recording, Rewards and recognitions for environmental efforts, Educational resources on ocean health, Partnership fostering for pollution reduction

**In-app purchases:** none


## Frequently asked questions

### Is ClassNK Directory free?

ClassNK Directory is free to download, with no in-app purchases.

### Is OI Maritime free?

OI Maritime is free to download, with no in-app purchases.

### Do ClassNK Directory or OI Maritime have ads?

Neither ClassNK Directory nor OI Maritime shows ads.

### Which is updated more often, ClassNK Directory or OI Maritime?

ClassNK Directory ships an update every 10 months, and OI Maritime every 2 weeks. Most recently, ClassNK Directory was updated on October 20, 2026 and OI Maritime on October 24, 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.*