Is D minder pro is good app?

Its an app for calculating vit D based on sun exposure and location. Are you guys aware of any kind of applications? Let me know if you know any or this one and pls feel free to drop your reviews in comments.

Its an app for calculating vit D based on sun exposure and location. Are you guys aware of any kind of applications? Let me know if you know any or this one and pls feel free to drop your reviews in comments.