Since it's often impossible to tell the difference between people
seeking feedback on their projects or startups, and people who are just
trying to advertise (spam), HN has special "Show HN" posts. You can find
them under the "show" link in the top menu, and if you want feedback on
your project, you can do your own "Show HN" submission. The rules for
doing a "Show HN" submission are here:
https://news.ycombinator.com/showhn.html