I'm surprised nobody has asked this, but do you know <i>why</i> your company failed?<p>1.5 years in development is too long to be in a silo without getting feedback from prospective customers; read about Customer Development (Steve Blank's "4 steps to the Epiphany" book) and Lean Startup methods (Eric Ries - The Lean Startup). And yes, you do <i>not</i> need to write a single line of code to get feedback from prospective customers. "Hey Mr. Customer, I was thinking of building X to solve your problem Y. What do you think?" is the cheapest thing you can do before you write a single LOC, the simplest question you can ask to gauge their immediate reaction.<p>Steve Blank says the difference between successful and failed startups is that the successful ones truly <i>understand</i> why customers buy. If people are buying from you but you don't understand why, you just got lucky and you won't know what hit you when your luck runs out, could be a market shift, or induced by a competitor. I'd humbly assert, if you failed, try to understand why you failed, so that you don't repeat your mistakes. If you don't know why you failed, then you just might repeat them - and thus that 1.5 years may very well just be useless (although I'm positive it's not). Write it down in words and internalize your lessons.<p>Also, reasons for failure could be further divided into things under your control and things not under your control. If it wasn't under your control, don't beat yourself over it. If it was, now you're that much wiser. Without a great wave, the best surfer in the world is still just some guy on a surf board.<p>Good luck and all the best!