# Roll Period vs Maritime Master

The clearest difference is in-app purchases: Roll Period at none against Maritime Master's 1. Roll Period also leads on iOS requirement (15.0 vs 17.6). Maritime Master's advantage is update cadence (daily vs every 13 months). On price, ads and device support there is nothing between them.

Both are free to download. Maritime Master sells 1 one-off in-app purchase. Roll Period asks for nothing beyond the download.

Roll Period ships an update every 13 months, Maritime Master daily. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Roll Period | Maritime Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/maritime-master-calcdeck/id6760967809/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Daily** |
| Monetization | — | Free |
| Size | 27 MB | 7 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Rob Grin](https://appshunter.io/developer/1835670007) | [MARITIME MASTER LIMITED](https://appshunter.io/developer/1107589346) |

## What reviewers say

### Roll Period

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

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

**In-app purchases:** none


### Maritime Master

[App page](https://appshunter.io/ios/app/maritime-master-calcdeck/id6760967809)

This app provides a comprehensive suite of 88 professional maritime calculators for navigation, celestial observation, tides, stability, weather, engineering, and more. It's designed for maritime professionals and enthusiasts, offering offline functionality and citing all formulas with their official sources.

**Highlights:** 88 professional maritime calculators, Offline functionality, Navigation calculations, Celestial observation tools, Stability and cargo calculations, Unit converters

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalcDeck Pro | $14.99 | one-time |


## Frequently asked questions

### Is Roll Period free?

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

### Is Maritime Master free?

Maritime Master is free to download, with in-app purchases available.

### Do Roll Period or Maritime Master have ads?

Neither Roll Period nor Maritime Master shows ads.

### Which is updated more often, Roll Period or Maritime Master?

Roll Period ships an update every 13 months, and Maritime Master daily. Most recently, Roll Period was updated on October 28, 2026 and Maritime Master on October 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.*