Every modern web framework has auto reload, so this is an app that’s only targeting people who know HTML well enough to hand write a page but don’t know about modern web development. Good luck, but I can’t imagine it’s a growing market.
This was more of a passion/craft project than one I expect will make a gigantic impact. A side motive was to help move out some code of our Hype app to an "app shell" where I can more quickly make other applications with the same trial/licensing/windowing/etc. components.
The main use-case where this tool has been useful, though, is when I'm working on my Mac app that uses WKWebView and Javascript pretty extensively. It's much faster to get little JS snippets right compared to the really slow build+run cycle in Xcode.