I've started a new game (for me anyways) called Torn. It has been around for years and has been pretty fun so far. It is similar to CN in that it is a RPG but there is way more things to do. Torn does have an app. The gameplay is basically to do as many illegal activities as possible. I'd definitely recommend it.
Note: I do have to be petty and request you use my referral if you want to start playing