You could always post it on HN :) I'm a bit older-ish (27) and from my experience, trying to keep your ideas to yourself is not really productive. Ideas are di

You could always post it on HN :) I'm a bit older-ish (27) and from my experience, trying to keep your ideas to yourself is not really productive. Ideas are dime a dozen and the best way to get feedback is to hand it out to people (even unfinished hacky proofs of concept will do). You could always go to family and friends, but there are two problems with this approach: 1. They may not be tech-inclined in which case they won't really "get" it. 2. They are your friends and family. They will, 90% of the time, give you positive reinforcement. Trust me. Nobody loves you as much as your mom does ;) Finally, I just want to say that random "idea advice" is generally pretty worthless anyway (even from random people on the internet). You won't see any genuine feedback until you have customers, not just some guy flipping through a couple of your pages going "I think the sign-in button should be bluer" or something to that effect. I would urge you to finish an alpha version and test it on a couple of potential/real customers. That's the absolute only way you'll get any poignant advice. I just want to add that a co-founder should bring something very real to the deal, not just a critical eye (you know what they say about opinions).