You're really better off following the Show HN format https://news.ycombinator.com/showhn.html https://news.ycombinator.com/showhn.html when you're ready to jus

You're really better off following the Show HN format https://news.ycombinator.com/showhn.html https://news.ycombinator.com/showhn.html when you're ready to just let people try what you're working on without having to send emails. You don't have to be anywhere close to done but you should be at a stage where there is something people can play with, however incomplete or unpolished. You're much more likely to get feedback that way.