# Cortex Onboard vs EZ Celestial Navigation

The clearest difference is price: Cortex Onboard at Free against EZ Celestial Navigation's $29.99. EZ Celestial Navigation's advantage is review sentiment (100% vs 56%) and rating (4.9 vs 3.8). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Cortex Onboard 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.

EZ Celestial Navigation holds the better App Store score, 4.9 against 3.8. Both are backed by a comparable volume of ratings — 12 and 26 respectively. Written reviews point the same way: 56% of Cortex Onboard's written reviews are positive against 100% of EZ Celestial Navigation's.

Cortex Onboard ships an update every 2 months, EZ Celestial Navigation monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Cortex Onboard | EZ Celestial Navigation |
| --- | --- | --- |
| Price | **Free** | $29.99 |
| Rating | [3.8 (12 ratings)](https://appshunter.io/ios/app/cortex-onboard/id1483406085/reviews) | **[4.9 (26 ratings)](https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240/reviews)** |
| Number of ratings | 12 | **26** |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#56** |
| Size | 22 MB | 153 MB |
| Requires iOS | 18.5 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Garmin New Zealand Ltd](https://appshunter.io/developer/557485484) | [EZ Celestial LLC](https://appshunter.io/developer/504153123) |

## What reviewers say

### Cortex Onboard

[App page](https://appshunter.io/ios/app/cortex-onboard/id1483406085)

Configure and update your marine electronics, and monitor vital boat data remotely. Receive alerts, view AIS information, and manage anchor watch from your mobile device.

**Highlights:** Configure and update Cortex devices, View AIS information and alerts, Manage Anchor Watch remotely, Monitor boat sensors and NMEA 2000 instruments, View battery, pressure, and position data

**In-app purchases:** none


### EZ Celestial Navigation

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

**Currently charting:** #56 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 Cortex Onboard free?

Cortex Onboard 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, Cortex Onboard or EZ Celestial Navigation?

EZ Celestial Navigation is rated higher. Cortex Onboard averages 3.8 out of 5 from 12 ratings, while EZ Celestial Navigation averages 4.9 from 26 ratings.

### Do Cortex Onboard or EZ Celestial Navigation have ads?

Neither Cortex Onboard nor EZ Celestial Navigation shows ads.

### Which is updated more often, Cortex Onboard or EZ Celestial Navigation?

Cortex Onboard ships an update every 2 months, and EZ Celestial Navigation monthly. Most recently, Cortex Onboard was updated on November 3, 2026 and EZ Celestial Navigation on November 3, 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.*