# Master vs SailPrep

The clearest difference is device support: SailPrep at 3 against Master's 1. SailPrep also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Master ships an update fortnightly, SailPrep every 2 weeks. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Master | SailPrep |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Free | — |
| Size | 305 MB | 66 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Peterjohn Chisholm](https://appshunter.io/developer/1602390398) | [Monika Zibolyte](https://appshunter.io/developer/6772920181) |

## What reviewers say

### Master

[App page](https://appshunter.io/ios/app/master-nav-colregs-iala-tests/id6758554000)

Practice maritime navigation rules and buoyage systems with this app. It helps you identify knowledge gaps and track your progress in mastering essential regulations for mariners.

**Highlights:** USCG Navigation Rules practice, IALA Maritime Buoyage System tests, Knowledge gap identification, Progress tracking, Developed by Master Mariner

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

**In-app purchases:** none


### SailPrep

[App page](https://appshunter.io/ios/app/sailprep/id6772920179)

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

**In-app purchases:** none


## Frequently asked questions

### Is Master free?

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

### Is SailPrep free?

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

### Do Master or SailPrep have ads?

Neither Master nor SailPrep shows ads.

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

Master ships an update fortnightly, and SailPrep every 2 weeks. Most recently, Master was updated on October 8, 2026 and SailPrep on October 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.*