# Sailor's Deck vs IRPCS

The clearest difference is ads: Sailor's Deck at none against IRPCS's shown. IRPCS's advantage is update cadence (every 3 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Sailor's Deck sells 3 one-off in-app purchases and IRPCS sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Sailor's Deck ships an update every 3 weeks, IRPCS every 3 days. The most recent releases landed on November 13, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Sailor's Deck | IRPCS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sailors-deck-colregs/id6761303264/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Paid | — |
| Size | 23 MB | 73 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Vladimir Arefev](https://appshunter.io/developer/1888773460) | [Paul Whittle](https://appshunter.io/developer/1076749256) |

## What reviewers say

### Sailor's Deck

[App page](https://appshunter.io/ios/app/sailors-deck-colregs/id6761303264)

Master navigation lights and day shapes for skipper exams with this flashcard app. It uses spaced repetition to build lasting visual memory, tracks your progress, and resurfaces difficult configurations until they stick. Study offline with no ads or subscriptions.

**Highlights:** Spaced repetition learning, Four-layer progression of study, Confusion pair training, Offline functionality, Progress tracking and session summaries, Association-specific terminology, Daily streak motivator

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Buy a Coffee | $2.99 | one-time |
| Generous Tip | $3.99 | one-time |


### IRPCS

[App page](https://appshunter.io/ios/app/irpcs/id6762519800)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IRPCS Pro 1 month | $4.99 | per month |
| IRPCS Pro | $29.99 | per year |


## Frequently asked questions

### Is Sailor's Deck free?

Sailor's Deck is free to download, with in-app purchases available.

### Is IRPCS free?

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

### Do Sailor's Deck or IRPCS have ads?

IRPCS shows ads; Sailor's Deck does not.

### Which is updated more often, Sailor's Deck or IRPCS?

Sailor's Deck ships an update every 3 weeks, and IRPCS every 3 days. Most recently, Sailor's Deck was updated on November 13, 2026 and IRPCS 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.*