# Nautical Calculator Preview vs EZ Celestial Navigation

The clearest difference is price: Nautical Calculator Preview at Free against EZ Celestial Navigation's $29.99. EZ Celestial Navigation's advantage is ads (none vs shown) and ratings volume (26 vs 1). On rating, update cadence, in-app purchases and device support there is nothing between them.

Nautical Calculator Preview is free to download; EZ Celestial Navigation costs $29.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Nautical Calculator Preview against 4.9 for EZ Celestial Navigation. That said, the two scores are not equally well evidenced: EZ Celestial Navigation has 26 ratings behind it against 1, so its average is the more settled of the two.

Nautical Calculator Preview ships an update every 3 weeks, EZ Celestial Navigation monthly. The most recent releases landed on August 7, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Nautical Calculator Preview | EZ Celestial Navigation |
| --- | --- | --- |
| Price | **Free** | $29.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231/reviews)** | [4.9 (26 ratings)](https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240/reviews) |
| Number of ratings | 1 | **26** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | **Ad-supported** | Paid |
| Best chart rank | — | **#21** |
| Size | 36 MB | 153 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Vu Cong](https://appshunter.io/developer/1532372627) | [EZ Celestial LLC](https://appshunter.io/developer/504153123) |

## What reviewers say

### Nautical Calculator Preview

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

This app provides comprehensive tools for marine navigation, including real-time ship movement, route planning, and advanced sailing calculations. It also offers features for collision avoidance, maneuvering, and learning maritime regulations and signaling.

**Highlights:** Real-time ship movement, Route planning, Mercator and Great Circle sailing, Collision avoidance, Maneuvering calculations, COLREGs and maritime signaling, Offline GPS

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

**In-app purchases:** none


### EZ Celestial Navigation

[App page](https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240)

**Currently charting:** #21 Top Paid · Navigation (US App Store)

This app simplifies celestial navigation using a sextant, providing tools to calculate your position at sea. It offers automated calculations or manual table access, with features for observation archiving and compass checks. Ideal for learning and practicing traditional navigation methods.

**Highlights:** Automated sight reduction and LOP plotting, Manual Nautical Almanac and Pub. 229 table access, Observation archiving and restoration, Compass check functionality, Printable Nautical Almanac pages and reports, Universal app for iOS and macOS

**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 EZ Celestial Navigation free?

EZ Celestial Navigation costs $29.99, with no in-app purchases.

### Which has better reviews, Nautical Calculator Preview or EZ Celestial Navigation?

Nautical Calculator Preview is rated higher. Nautical Calculator Preview averages 5.0 out of 5 from 1 ratings, while EZ Celestial Navigation averages 4.9 from 26 ratings.

### Do Nautical Calculator Preview or EZ Celestial Navigation have ads?

Nautical Calculator Preview shows ads; EZ Celestial Navigation does not.

### Which is updated more often, Nautical Calculator Preview or EZ Celestial Navigation?

Nautical Calculator Preview ships an update every 3 weeks, and EZ Celestial Navigation monthly. Most recently, Nautical Calculator Preview was updated on August 7, 2026 and EZ Celestial Navigation on September 16, 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.*