# Sample for Science vs Nautical Ship Flags

The clearest difference is in-app purchases: Sample for Science at none against Nautical Ship Flags's 2. Sample for Science also leads on iOS requirement (12.0 vs 15.2). Nautical Ship Flags's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Nautical Ship Flags sells 2 in-app purchases, starting at $0.99 per 7 days. Sample for Science asks for nothing beyond the download.

Sample for Science ships an update every 6 weeks, Nautical Ship Flags every 3 weeks. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sample for Science | Nautical Ship Flags |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (15 ratings)](https://appshunter.io/ios/app/nautical-ship-flags/id6737554146/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 58 MB | 7 MB |
| Requires iOS | **12.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Universidade Federal Fluminense - UFF](https://appshunter.io/developer/739312311) | [Stanislav Cekunov](https://appshunter.io/developer/1085076843) |

## What reviewers say

### Sample for Science

[App page](https://appshunter.io/ios/app/sample-for-science/id6470819452)

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

**In-app purchases:** none


### Nautical Ship Flags

[App page](https://appshunter.io/ios/app/nautical-ship-flags/id6737554146)

Explore maritime signal codes and Morse code with interactive quizzes and detailed flag information. Track your learning progress with an analytics view and practice signaling using your phone's flashlight. This app offers full offline functionality for continuous learning.

**Highlights:** Interactive quizzes, Flag details and reference, Flashlight Morse signaling, Progress tracking, Offline functionality, Analytics view

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Sample for Science free?

Sample for Science is free to download, with no in-app purchases.

### Is Nautical Ship Flags free?

Nautical Ship Flags is free to download, with in-app purchases available.

### Do Sample for Science or Nautical Ship Flags have ads?

Neither Sample for Science nor Nautical Ship Flags shows ads.

### Which is updated more often, Sample for Science or Nautical Ship Flags?

Sample for Science ships an update every 6 weeks, and Nautical Ship Flags every 3 weeks. Most recently, Sample for Science was updated on October 19, 2026 and Nautical Ship Flags on October 24, 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.*