A really good question! I've lanched an App and "it has been cloned". What makes and app successful depends on many things... - If you are the first launching it. - Your marketing strategy to reach the correct people - How the client benefits of your app, is it relevant? Useful? interesting? - Is your app user friendly and easy to share? - And many more... Also there are a Lot of things that the competition cannot copy, and in those things is what you have to focus. I hope this help at least a Little.