This can't be a Show HN until there's a way for people to try it out: https://news.ycombinator.com/showhn.html. I've taken Show HN out of the title now. Once it's available, you're welcome to come back and do a Show HN.

Also, please pick a single link for the top level, rather than encoding a second one into the title! If there are related URLs, the place to include them is in a comment in the thread; or, if you want, in initial text you can submit with your Show HN.