# Master vs e

The clearest difference is price: e at Free against Master's $1.99. e also leads on iOS requirement (12.3 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

e is free to download; Master costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Master ships an update fortnightly, e every 10 days. The most recent releases landed on October 1, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Master | e |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.7 (94 ratings)](https://appshunter.io/ios/app/master-nav/id1602390396/reviews)** | — |
| Number of ratings | **94** | — |
| Positive reviews | 96.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Paid | — |
| Size | 117 MB | 58 MB |
| Requires iOS | 15.0 | **12.3** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) | [ELOSOFT INC](https://appshunter.io/developer/1582738042) |

## What reviewers say

### Master

[App page](https://appshunter.io/ios/app/master-nav/id1602390396)

Learn maritime navigation rules with an interactive system designed for effective retention. This app breaks down complex regulations into manageable sections with visual aids and mnemonics. It revisits incorrect answers and provides instant graphical feedback, making the learning process intuitive and efficient.

**Highlights:** Interactive learning system, Step-by-step rule guidance, Mnemonics and memory aids, Interactive visuals, Graphical feedback on answers, Practice section with progress tracking

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

**In-app purchases:** none


### e

[App page](https://appshunter.io/ios/app/e-trb/id6458732896)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Master free?

Master costs $1.99, with no in-app purchases.

### Is e free?

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

### Do Master or e have ads?

Neither Master nor e shows ads.

### Which is updated more often, Master or e?

Master ships an update fortnightly, and e every 10 days. Most recently, Master was updated on October 1, 2026 and e on September 27, 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.*