Looks authentic to me
The app works well IMHO. It snows 5 months of the year here and the photos I tried it on look pretty authentic to me. Of course the app isnt going to add a foot of snow to your pictures if its not already there, but it does make bare ground look frosty the way it gets when its frozen. There are about a half dozen adjustable parameters and more presets. The default setting desaturates the colour but you dial it back in if you want. 4 stars only because nothings perfect.
garsdegranby about
Snow Daze, v1.09