Since this seems to be a list, best you remove the 'Show HN' prefix.

> Off topic: blog posts, sign-up pages, newsletters, lists, and other reading material. Those can't be tried out, so can't be Show HNs. Make a regular submission instead.

https://news.ycombinator.com/showhn.html

This is also partially an "Ask HN" for existing directories if there are any.