# Maritime Master vs Psychology Clinical Notes

The clearest difference is in-app purchases: Psychology Clinical Notes at none against Maritime Master's 1. Maritime Master's advantage is update cadence (daily vs every 3 weeks) and iOS requirement (17.6 vs 26.0). 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. Psychology Clinical Notes asks for nothing beyond the download.

Maritime Master ships an update daily, Psychology Clinical Notes every 3 weeks. Both last shipped on November 5, 2026.

## The numbers

| Metric | Maritime Master | Psychology Clinical Notes |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 weeks |
| Monetization | Free | — |
| Size | 7 MB | 1 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 9+ | 17+ |
| Developer | [MARITIME MASTER LIMITED](https://appshunter.io/developer/1107589346) | [RAVIA SOFTWARE DI VILLANOVA DOMENICO ANTONIO](https://appshunter.io/developer/1663855011) |

## What reviewers say

### 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 |


### Psychology Clinical Notes

[App page](https://appshunter.io/ios/app/psychology-clinical-notes/id6761124463)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Maritime Master free?

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

### Is Psychology Clinical Notes free?

Psychology Clinical Notes is free to download, with no in-app purchases.

### Do Maritime Master or Psychology Clinical Notes have ads?

Neither Maritime Master nor Psychology Clinical Notes shows ads.

### Which is updated more often, Maritime Master or Psychology Clinical Notes?

Maritime Master ships an update daily, and Psychology Clinical Notes every 3 weeks. Most recently, Maritime Master was updated on November 5, 2026 and Psychology Clinical Notes on November 5, 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.*