Above you can find a link to airline's official website. Airline has an official active Facebook page. JetSmart provides ability to check-in online for it's passengers. In addition airline also provides feature for mobile check-in on it's flights. Seems that JetSmart doesn't have an official iOS app for iPhone and iPad or we just don't know about it yet. Looks like airline doesn't have an official Android app or we just don't know about it yet.