# Nautical Calculator Preview vs Navigation Almanac

The clearest difference is ads: Navigation Almanac at none against Nautical Calculator Preview's shown. Navigation Almanac also leads on monetization model (free vs ad-supported) and update cadence (weekly vs every 2 weeks). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for Nautical Calculator Preview against 5.0 for Navigation Almanac. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Nautical Calculator Preview ships an update every 2 weeks, Navigation Almanac weekly. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Nautical Calculator Preview | Navigation Almanac |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/navigation-almanac/id6777455516/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Ad-supported | **Free** |
| Size | 33 MB | 4 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [The Vu Cong](https://appshunter.io/developer/1532372627) | [Vladyslav Zenchenko](https://appshunter.io/developer/6777455518) |

## 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


### Navigation Almanac

[App page](https://appshunter.io/ios/app/navigation-almanac/id6777455516)

This app provides a comprehensive offline celestial navigation toolkit. It calculates celestial body positions, sunrise/set times, and sky charts. It also offers tools for compass error correction and position fixing, all without requiring an internet connection.

**Highlights:** Offline celestial almanac data, Sight reduction calculations, Rise, set, and twilight times, Sky view chart and dome, Live GPS position and course, Compass error correction, Fix calculator

**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 Navigation Almanac free?

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

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

Nautical Calculator Preview and Navigation Almanac are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Nautical Calculator Preview or Navigation Almanac have ads?

Nautical Calculator Preview shows ads; Navigation Almanac does not.

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

Nautical Calculator Preview ships an update every 2 weeks, and Navigation Almanac weekly. Most recently, Nautical Calculator Preview was updated on October 7, 2026 and Navigation Almanac 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.*