Show Hacker News (Show HN) is for something you’ve made that other people can play with. Hacker News users can try it out, give you feedback, and ask questions in the thread. A Show HN needn’t be complicated or look slick. HN users are comfortable with work that’s at an early stage.
If your work isn’t ready for people to try out yet, please don’t put “Show HN” in the title. Once it’s ready, come back and share it then. For example, blog posts, email signups, and fundraisers can’t be tried out, so they don’t count as Show HNs.