Having just downloaded and poked at it, it looks very nice and familiar for those who want a Dark Sky type interface. The "oh, that's a feature I'd like" comes at a bit of "that's behind an IAP", but I suspect I'll be adding it to my weather section.
I like Carrot also - it has a lot of options to play with if you subscribe for it - They run sales esp year end sales if you can wait 11 months. You can also change the weather sources or api like Foreca and DarkSky and apple weather as well so maybe this Pirate one will be in there as well. I did not like the free version - I LOVED dark sky it was point of contention with the wife as accuweather was more accurate for planning. Peace.
Thank you for introducing me to it.