# Sailor's Deck vs Attention Lab

The clearest difference is update cadence: Attention Lab at weekly against Sailor's Deck's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Sailor's Deck sells 3 one-off in-app purchases and Attention Lab sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sailor's Deck ships an update every 3 weeks, Attention Lab weekly. The most recent releases landed on November 5, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sailor's Deck | Attention Lab |
| --- | --- | --- |
| 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 | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | — |
| Size | 23 MB | 39 MB |
| Requires iOS | 15.1 | **14.0.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vladimir Arefev](https://appshunter.io/developer/1888773460) | [KALLUM MARTIN](https://appshunter.io/developer/1896514205) |

## 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 |


### Attention Lab

[App page](https://appshunter.io/ios/app/attention-lab/id6767850515)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $0.99 | one-time |


## Frequently asked questions

### Is Sailor's Deck free?

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

### Is Attention Lab free?

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

### Do Sailor's Deck or Attention Lab have ads?

Neither Sailor's Deck nor Attention Lab shows ads.

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

Sailor's Deck ships an update every 3 weeks, and Attention Lab weekly. Most recently, Sailor's Deck was updated on November 5, 2026 and Attention Lab on October 25, 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.*