Windy is amazing, but I see them as two separate uses. Windy gives you data. A shit ton of data. It’s great for weather nerds and those that rely on accurate weather data. Windy was incredibly valuable to me navigating the Great Lakes and the Atlantic Coast. The wave height and wind visualization is outstanding.

Dark sky is better for the consumer though IMO. It just did a better job of answering the question: do I need an umbrella at this location at this time?