Nettla allows clubs to be available 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 log in with your usual details.
Bookings and purchases that you make in the Nettla app or an operator's own mobile app powered by Nettla are updated 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.