# DRFT MRKS vs Roll Period

The clearest difference is update cadence: DRFT MRKS at monthly against Roll Period's every 13 months. Roll Period's advantage is iOS requirement (15.0 vs 18.0). 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.

DRFT MRKS ships an update monthly, Roll Period every 13 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | DRFT MRKS | Roll Period |
| --- | --- | --- |
| 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 | **Monthly** | Every 13 months |
| Monetization | Free | — |
| Size | 60 MB | 27 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tymor Marine Ltd](https://appshunter.io/developer/1769206109) | [Rob Grin](https://appshunter.io/developer/1835670007) |

## What reviewers say

### 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


### Roll Period

[App page](https://appshunter.io/ios/app/roll-period/id6751540867)

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

**In-app purchases:** none


## Frequently asked questions

### Is DRFT MRKS free?

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

### Is Roll Period free?

Roll Period is free to download, with no in-app purchases.

### Do DRFT MRKS or Roll Period have ads?

Neither DRFT MRKS nor Roll Period shows ads.

### Which is updated more often, DRFT MRKS or Roll Period?

DRFT MRKS ships an update monthly, and Roll Period every 13 months. Most recently, DRFT MRKS was updated on November 4, 2026 and Roll Period on October 30, 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.*