OpenRouteService Frontend

As Project’s repository says (https://github.com/GIScience/openrouteservice), the demonstration server comes with both backend and frontend and subsequently says that it’s frontend is an forked and edited version of GraphHopper which is, as far as I’m corncerned, a frontend service.
Does ORS have itself a frontend app or it uses GraphHopper?

No you got it mixed up. The backend builds on GH (though really just some core stuff, most is ours) and our frontend is our own entirely:

And what’s the question here?

Thanks for clarifying.