# Nautical Calculator Preview vs Orastra

The clearest difference is ads: Orastra at none against Nautical Calculator Preview's shown. Orastra also leads on iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | Nautical Calculator Preview | Orastra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Monetization | Ad-supported | — |
| Size | 33 MB | 27 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [The Vu Cong](https://appshunter.io/developer/1532372627) | [ABDULLAH CAGRI TAS](https://appshunter.io/developer/1864244623) |

## What reviewers say

### Nautical Calculator Preview

[App page](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231)

This app assists with critical marine navigation tasks, including real-time ship movement, route planning, and complex sailing calculations. It also provides tools for collision avoidance, maneuvering, and learning maritime regulations and signaling.

**Highlights:** Real-Time Ship Movement, Route Planning, Mercator & Great Circle Sailing, Collision Avoidance, Maneuvering Calculations, COLREG Rules & Marine Signaling, Offline GPS

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

**In-app purchases:** none


### Orastra

[App page](https://appshunter.io/ios/app/orastra/id6760255995)

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

**In-app purchases:** none


## Frequently asked questions

### Is Nautical Calculator Preview free?

Nautical Calculator Preview is free to download, with no in-app purchases.

### Is Orastra free?

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

### Do Nautical Calculator Preview or Orastra have ads?

Nautical Calculator Preview shows ads; Orastra does not.

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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.*