Hello, how are you?I have recently been diabetic, with what I am lost, but I have downloaded an application recommended by another diabetic, in which apart from making graphics and annotations, the window that I see is that it calculates the insulin dose that you have to inject yourself, taking into account your daily routines and your needs.It is called Cafydia and is available at Link I hope it helps you
Here you have the direct link to the application that recommends @mica10, I have not tried it, but from what I have seen in the Google Store, it looks good, and it seems quite complete.