I'd be curious, too. The one I've used on Android, "LiveWeather," doesn't show any data any more. I just go to the noaa.gov web site now, but I'd be interested in a better app if anyone has a suggestion.
If they pull the real-time buoy data from the source, no one app is going to be more accurate than any other. It's more about the ease of use and clarity of the display.
I see that WindyTV has wave height, swell and period data. I’ve used it for wind but not sea conditions. Does anybody have any thoughts on WindyTV’s accuracy?
If you travel outside the US there are no NOAA buoy, i.e. BC. You will have to access Environmental Canada web page. I use Siris marine weather linked to my display.
I see that WindyTV has wave height, swell and period data. I’ve used it for wind but not sea conditions. Does anybody have any thoughts on WindyTV’s accuracy?
Waterway Guide recently did a competition between various options. To access it go to https://www.waterwayguide.com/search-results and type "weather app" in the search box. There are four rounds and it's still a very limited comparison but interesting.