i.joind.in is the best joind.in app for your iPhone and iPad. It improves a lot the user experience of the official app with a new design, features, often releases, and much more. Despite not being the official app, it helps the attendance before, during and after the conference. If you are speaker, it helps you to identify what conferences are in Call for Papers.
If you dont know joind.in (https://joind.in), its the replacement for all those paper submission forms that get left on the floor at the end of an event. The site gives details of events past, present and future, the sessions, timetable and speakers at each, and allows all attendees to register and leave feedback - for the sessions and for the event itself. joind.in is a trademark of joind.in.