# Marine Schedule vs Duty shift

The clearest difference is in-app purchases: Marine Schedule at none against Duty shift's 1. Marine Schedule also leads on device support (3 vs 1) and iOS requirement (10.0 vs 17.6). On price, update cadence and ads there is nothing between them.

Both are free to download. Duty shift sells 1 one-off in-app purchase. Marine Schedule asks for nothing beyond the download.

Marine Schedule ships an update every 2 weeks, Duty shift every 9 days. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Marine Schedule | Duty shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/duty-shift/id6755762933/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 16 MB | 9 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SunHyeob Kim](https://appshunter.io/developer/946982071) | [Mateusz Moc](https://appshunter.io/developer/1856182326) |

## What reviewers say

### Marine Schedule

[App page](https://appshunter.io/ios/app/marine-schedule/id1438388159)

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

**In-app purchases:** none


### Duty shift

[App page](https://appshunter.io/ios/app/duty-shift/id6755762933)

Manage your maritime crew's watch schedules and logbook with this assistant app. It automates rotations, tracks GPS positions, and sends timely notifications for watch changes. Personalize crew profiles and export professional documents in the Pro version.

**Highlights:** Smart schedule generation (Fixed or Fair Rotation), Automatic GPS logbook with route history, Watch change notifications, Personalized "That's Me" timer, Crew list with emoji avatars, PDF export of crew lists and agendas (Pro), Voyage file sharing (Pro)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version | $3.99 | one-time |


## Frequently asked questions

### Is Marine Schedule free?

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

### Is Duty shift free?

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

### Do Marine Schedule or Duty shift have ads?

Neither Marine Schedule nor Duty shift shows ads.

### Which is updated more often, Marine Schedule or Duty shift?

Marine Schedule ships an update every 2 weeks, and Duty shift every 9 days. Most recently, Marine Schedule was updated on October 4, 2026 and Duty shift on October 10, 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.*