Hi
Working on a Android specific project using Unity Pro(perpetual license).
Do I need the Android Pro add on?
What else does it allow other than custom splash screens?
You don’t need a pro licence for the custom splash screen. It’s available in all, the only thing plus and pro does is allow you to turn it off.
I suggest you look at the license comparison page to see what the benefits are: http://download.unity3d.com/unity/licenses