Nettla offers clubs to exist both in the Nettla mobile app as well as having their own mobile app Powered by Nettla, that carries their name. Your user account is still unified (remains the same) across both apps, and you can simply login with your normal information.
Bookings and purchases that you make in the Nettla app or an operators own mobile app powered by Nettla updates across both environments, so you can decide where you want to manage your padel activities.
Some clubs may have chosen to not be part of the standard Nettla app, and you must therefore download their own app in order to interact with that specific club.