# Nautical Calculator Preview vs Celestial Nav

The clearest difference is rating: Nautical Calculator Preview at 5.0 against Celestial Nav's 4.3. Nautical Calculator Preview also leads on in-app purchases (none vs 6) and iOS requirement (13.0 vs 15.0). Celestial Nav's advantage is ads (none vs shown) and ratings volume (10 vs 1). On price, update cadence and device support there is nothing between them.

Both are free to download. Celestial Nav sells 6 in-app purchases, starting at $1.99 per month. Nautical Calculator Preview asks for nothing beyond the download.

Nautical Calculator Preview holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Celestial Nav has 10 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on August 7, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Nautical Calculator Preview | Celestial Nav |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/celestial-nav/id1569880598/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | — | 58.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 36 MB | 20 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Vu Cong](https://appshunter.io/developer/1532372627) | [Skytip LLC](https://appshunter.io/developer/1569880600) |

## 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


### Celestial Nav

[App page](https://appshunter.io/ios/app/celestial-nav/id1569880598)

This app provides tools for celestial navigation, offering computations for celestial bodies and sight reductions. It includes an offline perpetual almanac and allows for quick capture of observation data for accurate course adjustments.

**Highlights:** Celestial navigational computations, Offline perpetual almanac, Quick celestial observation data capture, High accuracy sight reductions, Sight planning and reduction tools, Celestial fix computations

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version | $1.99 | per month |
| PRO Version | $7.99 | per 6 months |
| PRO Version | $9.99 | per year |
| 7 Day Trial License | $0.99 | one-time |
| 30 Day Trial License | $2.99 | one-time |
| PRO Version Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Nautical Calculator Preview free?

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

### Is Celestial Nav free?

Celestial Nav is free to download, with in-app purchases available.

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

Nautical Calculator Preview is rated higher. Nautical Calculator Preview averages 5.0 out of 5 from 1 ratings, while Celestial Nav averages 4.3 from 10 ratings.

### Do Nautical Calculator Preview or Celestial Nav have ads?

Nautical Calculator Preview shows ads; Celestial Nav does not.

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

Nautical Calculator Preview ships an update every 3 weeks, and Celestial Nav every 3 weeks. Most recently, Nautical Calculator Preview was updated on August 7, 2026 and Celestial Nav on September 13, 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.*