Watt And Sea vs Cortex Onboard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Watt And Sea
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.
- Real-time data monitoring (current, voltage, status)
- Bluetooth connectivity
- Data logging and sharing
- Access to knowledge database
- Error status reporting
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This app allows you to : * Connect to embedded Bluetooth module of the Watt And Sea hydrogenerator. * Monitor the data in real time (current, voltage, status and errors) * Record datalogs and share them by email to Watt And Sea support * Get access to our online knowledge database to troubleshoot frequent problems.
Cortex Onboard
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.
- 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
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Cortex Onboard is free with your Cortex. Use it to configure your Cortex Hub and download updates to your Cortex devices with new features and improvements. You can also use Cortex Onboard to receive and manage alerts, view AIS information and instrument data anywhere on board your boat. View out-of-the-box sensors or NMEA 2000 networked instruments. - Setup is easy and free. - Use Cortex Onboard to configure and update your Cortex devices easily. - View AIS information and receive alerts on board direct to your device. - Manage Anchor Watch from the palm of your hand anywhere on board. - Use the Cortex Hub’s built-in sensors for battery level, barometric pressure and boat position. - Connect your Cortex Hub to NMEA 2000, or an external sensor, to add monitoring for wind, depth, bilge high water, temperature, shore power or security. - The Cortex Hub supports up to 10 WiFi devices (includes Handsets).
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Watt And Sea | Cortex Onboard |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.8 (12 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 55.6% of reviews |
| Number of ratings | — | 12 — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 11 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthieu Michou | Garmin New Zealand Ltd |
Customer experience
Watt And Sea
Cortex Onboard
In-app purchases
Watt And Sea
No in-app purchases
Cortex Onboard
No in-app purchases
