Everyone that has answered your question just gave you years of experience and thousands of dollars in advice for free. Most business ventures like this don't get out the door, not because it's not a good idea, but you may see the vision, but getting others as excited as you is extremely difficult in most cases. I've been working on a project for more than ten years in my spare time (not good for venture capitalist lol) and I have had hundreds of road blocks and have spent more money than I care to tell you about. I've had several partners that all gave up. It's very hard to continue with a vision once obstacles start popping up everywhere. Whatever you do I suggest you get a NON-DISCLOSURE AGREEMENT with whomever you decide to reveal you concept. If it's a billion dollar idea like you say, then I am going to tell you this. If you are that confident sell everything, downsize your home, get rid of your car and box yourself into a room and finish the app. Don't you think the sacrifice now would be worth making a billion dollars? If that's not reasonable for the creator of the concept, just imagine how investors are going to look view the idea. Good Luck. B