You don't even have to host it yourself. It runs in browser. You can also download it and run it as a file I think. My only complaint is that with my limited

You don't even have to host it yourself. It runs in browser. You can also download it and run it as a file I think. My only complaint is that with my limited knowledge of JavaScript, the docs lack the info I need to contribute my own tools. For example, I find myself needing a substring tool but there isn't one :(