I've made an app & website that lets you quickly try out java snippets on android, e.g. if you see a code snippet on stack overflow you can just copy paste it and throw it in and let it run on your phone. But I didn't continue with it because no one uses it :) https://runondroid.com/

Yo that's pretty neat right there...

Nice. It looks useful to me.

If the tool itself only supports running on Chrome and Safari (i.e. webkit), I wouldn't trust the tool to produce code anywhere near standards compliant or deployable on the public web.