Show HN is the part of Hacker News where people share something they have made that others can try. A post titled "Show HN: …" appears in its own list and can reach the front page.
The rules are short: it must be something people can use or run, not a landing page or a waitlist, and the maker should be around to answer questions.
The audience is technical and blunt. Plain titles and honest descriptions do well; marketing language does not.
Why it matters for a launch
For developer tools and technical products it can be the single biggest day of traffic you get, and the comments are detailed feedback from exactly the people who would use it.
Read more: How to post a Show HN