# Port Go vs Maritime Master

The clearest difference is in-app purchases: Port Go at none against Maritime Master's 1. Maritime Master's advantage is update cadence (daily vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

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

Port Go ships an update every 10 days, Maritime Master daily. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Port Go | 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 10 days | **Daily** |
| Monetization | — | Free |
| Size | 54 MB | 7 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Grieg Connect AS](https://appshunter.io/developer/655577330) | [MARITIME MASTER LIMITED](https://appshunter.io/developer/1107589346) |

## What reviewers say

### Port Go

[App page](https://appshunter.io/ios/app/port-go/id6447566123)

**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 Port Go free?

Port Go 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 Port Go or Maritime Master have ads?

Neither Port Go nor Maritime Master shows ads.

### Which is updated more often, Port Go or Maritime Master?

Port Go ships an update every 10 days, and Maritime Master daily. Most recently, Port Go was updated on October 27, 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.*