# Watt And Sea vs Cortex Onboard

The clearest difference is review sentiment: Watt And Sea at 100% against Cortex Onboard's 56%. Watt And Sea also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (14.0 vs 18.5). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Watt And Sea ships an update every 3 weeks, Cortex Onboard every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Watt And Sea | Cortex Onboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (12 ratings)](https://appshunter.io/ios/app/cortex-onboard/id1483406085/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | **100.0% of reviews** | 55.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 11 MB | 22 MB |
| Requires iOS | **14.0** | 18.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Matthieu Michou](https://appshunter.io/developer/1465383699) | [Garmin New Zealand Ltd](https://appshunter.io/developer/557485484) |

## What reviewers say

### Watt And Sea

[App page](https://appshunter.io/ios/app/watt-and-sea/id1465383700)

Monitor your hydrogenerator's performance in real-time. Connect via Bluetooth to view current, voltage, and status. Record and share data logs, and access a knowledge base for troubleshooting.

**Highlights:** Real-time data monitoring (current, voltage, status), Bluetooth connectivity, Data logging and sharing, Access to knowledge database, Error status reporting

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Watt And Sea free?

Watt And Sea is free to download, with no in-app purchases.

### Is Cortex Onboard free?

Cortex Onboard is free to download, with no in-app purchases.

### Do Watt And Sea or Cortex Onboard have ads?

Neither Watt And Sea nor Cortex Onboard shows ads.

### Which is updated more often, Watt And Sea or Cortex Onboard?

Watt And Sea ships an update every 3 weeks, and Cortex Onboard every 2 months. Most recently, Watt And Sea was updated on November 3, 2026 and Cortex Onboard on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*