(Not affiliated with the app, just happy with it.) It tells you the sun angle, peak hour of the day, and maximum time you should be in that day's sun based on your skin type, to avoid getting burnt while still getting enough D.
Be careful though - you might get a little OCD about Vitamin D tracking with this app. I did, and mainly use it now for checking how long it is safe to stay outdoors. (Instead of full blown tracking.)
Yes, if you want it to. Looking at my notifications screen in the app, it can notify about "D Window Events", and you can even specify the minimum angle of interest.
It can also notify upon solar noon, sunrise and sunset (not the same as a D window of opportunity), and give a daily supplement reminder. Each of these is individually configurable.
(Not affiliated with the app, just happy with it.) It tells you the sun angle, peak hour of the day, and maximum time you should be in that day's sun based on your skin type, to avoid getting burnt while still getting enough D.
Be careful though - you might get a little OCD about Vitamin D tracking with this app. I did, and mainly use it now for checking how long it is safe to stay outdoors. (Instead of full blown tracking.)