# Cortex Onboard vs EZ Sextant

The clearest difference is price: Cortex Onboard at Free against EZ Sextant's $24.99. Cortex Onboard also leads on ratings volume (12 vs 4) and iOS requirement (18.5 vs 26.0). EZ Sextant's advantage is review sentiment (100% vs 56%) and rating (5.0 vs 3.8). On ads, in-app purchases and device support there is nothing between them.

Cortex Onboard is free to download; EZ Sextant costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

EZ Sextant holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 12 and 4 respectively. Written reviews point the same way: 56% of Cortex Onboard's written reviews are positive against 100% of EZ Sextant's.

Cortex Onboard ships an update every 2 months, EZ Sextant monthly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Cortex Onboard | EZ Sextant |
| --- | --- | --- |
| Price | **Free** | $24.99 |
| Rating | [3.8 (12 ratings)](https://appshunter.io/ios/app/cortex-onboard/id1483406085/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/ez-sextant/id6477748851/reviews)** |
| Number of ratings | **12** | 4 |
| 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 |
| Size | 22 MB | 3 MB |
| Requires iOS | **18.5** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Garmin New Zealand Ltd](https://appshunter.io/developer/557485484) | [Third Reef Software LLC](https://appshunter.io/developer/1730250544) |

## 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 Sextant

[App page](https://appshunter.io/ios/app/ez-sextant/id6477748851)

Navigate open waters using your phone's camera to sight celestial bodies. This app plots lines of position and combines them for an estimated location on a lat/lon grid. It's a powerful tool for offshore navigation without relying on GPS.

**Highlights:** GPS-free navigation, Camera-based celestial sightings, Automatic position plotting, Built-in almanac, Running fix calculations, Lat/lon grid display

**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 Sextant free?

EZ Sextant costs $24.99, with no in-app purchases.

### Which has better reviews, Cortex Onboard or EZ Sextant?

EZ Sextant is rated higher. Cortex Onboard averages 3.8 out of 5 from 12 ratings, while EZ Sextant averages 5.0 from 4 ratings.

### Do Cortex Onboard or EZ Sextant have ads?

Neither Cortex Onboard nor EZ Sextant shows ads.

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

Cortex Onboard ships an update every 2 months, and EZ Sextant monthly. Most recently, Cortex Onboard was updated on November 3, 2026 and EZ Sextant on November 4, 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.*