Is there currently a Germany-wide rental car (chauffeur) broker (something like Uber, Freenow or Flyn?

Uber and Freenow already exist in big cities. Is there something like this in smaller cities, like across Germany? By that, I don't just mean a way like Uber that offers its own drivers, but rather, for example, an app that also connects other rental car companies and limousine services with their own cars and…