One more thing about using the "compare" feature on a phone...On my Samsung, I had to use smaller font setting in order to have the "compare" button to show on my screen. I don't alway have reading glasses with me so I had my font setting on a larger size. That setting had the compare button 99% off my screen and not clickable. Check your font size if you are having trouble with seeing "compare".
And I realize not everyone reads every post in a thread so I will repeat...
Use Windy.com not Windy.app