This was a very interesting string of posts to read about text size on iPads. I agree with Julie, anyone using ARIS in connection with schools is most likely using iPads or iPad minis and not iPhones. I purchased 15 iPad minis with cellular access just to use ARIS in my outreach work through the University of Northern Iowa.
I also wanted to add one more bit that I didn't see mentioned in the thread. On the iPad minis, most text seems to work pretty well in 2x mode, with the exception of a couple of things:
1) most importantly, My Notes (with Tags) in the Notebook are displayed with text that is too large for the line so both top and bottom gets cut off.
2) The splash screen text is still super tiny.
I'm wondering if I need to install an ARIS update? I'm running version 20161220. Has there been a new update since then?