Several things going on here. There are two ways to access Roll20 on mobile devices: The Roll20 App This only gives access to sheets, chat, die roller, and handouts. It is meant to be a play aid, not a way to use Roll20 in full. This is currently very buggy on iPad and frequently doesn't load at all. Years ago there was a functioning App, then Apple changed its policies on what was an acceptable build for the App Store (basically, no Web Apps). There have been attempts to rebuild the app since then, but it is still extremely buggy. The ground up rebuild is what is currently in active development. Table on Tablet This is the ability to launch a game with full capability from a tablet device (phones are not supported or recommended, but may work). This is a subscription perk. It by and large works, though the touch interface is not as robust as the desktop interface.