# ClassNK Directory vs Phoenix ESM

The clearest difference is update cadence: Phoenix ESM at every 6 weeks against ClassNK Directory's every 10 months. On price, ads, 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.

ClassNK Directory ships an update every 10 months, Phoenix ESM every 6 weeks. The most recent releases landed on September 16, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | ClassNK Directory | Phoenix ESM |
| --- | --- | --- |
| 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 6 weeks** |
| Monetization | Free | — |
| Size | 15 MB | 51 MB |
| Requires iOS | 15.6 | **15.5** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [NIPPON KAIJI KYOKAI GENERAL INCORPORATED FOUNDATION](https://appshunter.io/developer/956676437) | [SOUTH NESTS SOFTWARE SOLUTIONS AND PRIVATE LIMITED](https://appshunter.io/developer/1542763741) |

## 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


### Phoenix ESM

[App page](https://appshunter.io/ios/app/phoenix-esm/id1664042418)

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

**In-app purchases:** none


## Frequently asked questions

### Is ClassNK Directory free?

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

### Is Phoenix ESM free?

Phoenix ESM is free to download, with no in-app purchases.

### Do ClassNK Directory or Phoenix ESM have ads?

Neither ClassNK Directory nor Phoenix ESM shows ads.

### Which is updated more often, ClassNK Directory or Phoenix ESM?

ClassNK Directory ships an update every 10 months, and Phoenix ESM every 6 weeks. Most recently, ClassNK Directory was updated on September 16, 2026 and Phoenix ESM on September 14, 2026.

---

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