Knotlog for Wear OS

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Rated for 3+
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Content rating
Rated for 3+
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About this app

Knotlog keeps your logbook while you sail. Two actions on the watch: "Cast off" when you leave, "Moored" when you are in port, on a mooring or at anchor.

ON YOUR WEAR OS WATCH
The app runs on the watch itself, no phone needed while you sail:
- Live screen with nautical miles over ground, speed in knots, course over ground and time under way
- Every port goes into the log with position and time, undo for a mistaken press
- Air pressure from the watch barometer
- Several legs form one voyage until you choose "New voyage"
- Without a connection every leg waits on the watch and uploads later
- Always dark, warm colours only at night to keep your night vision

Pairing: open the app and enter the code at knotlog.app/w on your phone. A knotlog.app account is required.
Add crew, photos and port names later on the phone or the web.

Knotlog is a logbook, not a navigation device. Use your chartplotter and charts to navigate.

Location is used for the track and the port positions while a leg runs.
Cast off, moor, done. The log writes itself.
Updated on
9 Nov 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Location, Personal info and App activity
  • Data is encrypted in transit
  • You can request that data be deleted

What's new

Fixes: the app icon now shows at startup, scroll bar on every scrolling screen, nothing cut off with large text.