That's a wonderful idea! I keep checking Apple, searching in vain for a Wikitree app. I have more than 200 Lee cousins on a page dedicated to discovering more about brothers Greenberry and Eley/Ely Lee, brothers of Halifax, NC, Williamsburg, SC and Putnam County, Ga, our common ancestors.
So I KNOW of at least 200 would-be app-users
Sandy Taylor