Being stealth is seriously a detriment most of the time, if not all. Get out there and start getting feedback while meeting awesome people who are interested in what you're doing. You never know who you will be connected with or who will share your passion. You can only meet those people by putting yourself out there. It's not like you have to put your source code, algorithm, and five year road map out there for everyone. Even if you did do that... what are the odds that someone is interested in the same thing, has the same vision, is competent enough to execute on it, and most importantly actually DO IT? The odds are a number somewhere very very close to zero, whereas the odds of putting yourself out there and meeting someone who can help you are very very close to one-hundred.