Hello, here is our portfolio http://meliorgames.com. Our company is providing highly professional business app and game development services for iOS/Android. In our portfolio there are only our own games presented where everything (graphics/programming) is our own idea and implementation, however the major part of our work are outsource projects (business apps and games) that are closed for review due to signed NDA. We have rich experience in developing applications of different complexity for more than 5 years already and we are able and ready to create for you quality chat app for iPhone/Android. We will give you a true quote as soon as you provide us with details. If you are interested, please contact us we will discuss the work. We will be waiting for your reply. Thanks. Best regards