The app lives on checkyouraccent.com
Feel free to play with it and check how many points you can score!
If you're interested in the source code, you can simply check it in the browser (it's pretty simple and not transpiled/minified). The implementation is quick and dirty, but if you like it I could make it open-sourced and refactor to be a good one. So please leave a comment if you like it. Cheers!