Crete simple Messenger Native iOS App

Hi, I need a simple chatting iOS Native App. The overall idea is to tempt friends and family into taking small bits of extra physical activity, using messages and content as the incentive. I will provide with the backend API but if you know parse then that is also acceptable. Attached is the screenshot of the App. - User1 sends message or picture message to User2. - User1 sets the number of steps User2 has to walk before User2 can see the message clearly (see img_6328). - User2 receives message (which appears blurred), with indication of how many steps he must walk before being able to see the message clearly (ie un-blurred) (see img_6326). - When User2 starts to walk the step counter reflects the number of steps he is walking, and when he reaches the target (in this case lets say 100) the message appears unblurred (see img_6327). Apart from login/registration,friends request, friends acceptance screens. There will be push notification involved in the App for friends request/accept. I would like to have chat via socket.io. Miscellaneous: - probably best approach is to call M7 functions (ie iphone 5 and later have the m7 chip to help pedometer functions etc) Remember, its a small App so do estimate wisely. Thanks.