Agreed - IMO, until 2 or more players have saturated the market, competition isn't going to necessarily keep you out. Two other bits of advice: 1. Find someth

Agreed - IMO, until 2 or more players have saturated the market, competition isn't going to necessarily keep you out. Two other bits of advice: 1. Find something limited in scope, and build it under constraints. At least to start, assuming that you're going to keep your day job. In other words: can you build something that actually has value, and that you would use, in 40 hours? This is a good exercise for a first startup project, and can keep you from running down a rabbit hole. 2. Decide if this is a side project or a full-time job. If it is a side project, you can build something you like and help it grow slowly, without worrying about your take-home pay right away. If you're going to quit your day job, the stakes are much higher - you can't rely on slow growth (because your rent/mortgage depends on profit), and you should never rely on explosive viral growth (because it probably won't happen to you, no matter how good you are).