Google hangout app is best app for chatting by your google account. Hangout is googles chatting app by you can chat your friend who is connect to you by google acoount. Its concept is very simple and usefull. It is very stable app and dont show any leg. I used it from very long time. Layout is very simple and good. Performance is also good. It is present with very good and usefull features. Chat theme and layout is very pretty. And mostly it is available in every android phone. It comes with stock android.