# All Units vs Maritime Master

The clearest difference is rating: All Units at 5.0 against Maritime Master's 3.0. All Units also leads on in-app purchases (none vs 1) and iOS requirement (15.0 vs 17.6). Maritime Master's advantage is ads (none vs shown) and update cadence (daily vs every 3 days). On price, ratings volume and device support there is nothing between them.

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

All Units holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

All Units ships an update every 3 days, Maritime Master daily. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | All Units | Maritime Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/all-units/id1663552827/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/maritime-master-calcdeck/id6760967809/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Daily** |
| Monetization | Ad-supported | **Free** |
| Size | 7 MB | 7 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Vladyslav Yarmak](https://appshunter.io/developer/1456545549) | [MARITIME MASTER LIMITED](https://appshunter.io/developer/1107589346) |

## What reviewers say

### All Units

[App page](https://appshunter.io/ios/app/all-units/id1663552827)

This free utility app simplifies unit conversions for various measurements, saving time for technicians, students, and everyday users. It offers a wide range of conversion categories to make calculations easy and accurate.

**Highlights:** Unit conversion, Volume, Length, Mass, Temperature, Velocity, Time

**Features:** 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 All Units free?

All Units is free to download, with no in-app purchases.

### Is Maritime Master free?

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

### Which has better reviews, All Units or Maritime Master?

All Units is rated higher. All Units averages 5.0 out of 5 from 1 ratings, while Maritime Master averages 3.0 from 1 ratings.

### Do All Units or Maritime Master have ads?

All Units shows ads; Maritime Master does not.

### Which is updated more often, All Units or Maritime Master?

All Units ships an update every 3 days, and Maritime Master daily. Most recently, All Units was updated on October 15, 2026 and Maritime Master on October 14, 2026.

---

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