The first thing that cracks me up is this startup screen for the Calculator. It is true that traditionally graphic designer and app developers love to put a startup screen in the applications. It is almost a standard practice – perhaps adapted from early video games. Unlike loading view (launch image), which reduces the anxiety to wait for the application to load, startup screen barely does anything (except to allow the users to login).
Another note I took is to inform users “about the situation and explain what they can do about it.” I often like to leave out views in my apps when in the progress of development. I feel it would be nice to add these “unavailable features” to the alpha apps even though it will take up more development time. In exchange of the development time, I could present the app to the test users without raising some negative confusions.
I never thought the most important element is on the top-left of the screen. I thought it is on the center of the screen. This is something I feel people can debate about…