# Graypen Group Directory vs DRFT MRKS

The clearest difference is update cadence: DRFT MRKS at monthly against Graypen Group Directory's every 6 months. Graypen Group Directory's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 18.0). On price, ads and in-app purchases there is nothing between them.

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

Graypen Group Directory ships an update every 6 months, DRFT MRKS monthly. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Graypen Group Directory | DRFT MRKS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/drft-mrks/id6741070099/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | — | Free |
| Size | 54 MB | 60 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Passport-IT Limited](https://appshunter.io/developer/1263987289) | [Tymor Marine Ltd](https://appshunter.io/developer/1769206109) |

## What reviewers say

### Graypen Group Directory

[App page](https://appshunter.io/ios/app/graypen-group-directory/id1263987290)

**Features:** macOS Compatibility

**In-app purchases:** none


### DRFT MRKS

[App page](https://appshunter.io/ios/app/drft-mrks/id6741070099)

This application uses AI and deep learning to accurately measure a vessel's draft from a short HD video. It aims to provide a verifiable source of truth for calculating vessel displacement, improving accuracy in determining loaded cargo and equipment.

**Highlights:** AI/Deep Learning technology, Measures vessel draft from video, Improves draft reading accuracy, Verifiable source of truth, Calculates vessel displacement

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Graypen Group Directory free?

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

### Is DRFT MRKS free?

DRFT MRKS is free to download, with no in-app purchases.

### Do Graypen Group Directory or DRFT MRKS have ads?

Neither Graypen Group Directory nor DRFT MRKS shows ads.

### Which is updated more often, Graypen Group Directory or DRFT MRKS?

Graypen Group Directory ships an update every 6 months, and DRFT MRKS monthly. Most recently, Graypen Group Directory was updated on October 13, 2026 and DRFT MRKS on October 20, 2026.

---

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