This app takes over the space allocation of tennis clubs, which was previously operated in paper form. It brings the clubs' free tennis courts together with the players. Tennis clubs can use this app to make their tennis courts available for online occupancy. Tennis players, on the other hand, can easily and easily occupy these tennis courts with this app. The playing times of the players are automatically derived from the assignments, which are displayed chronologically for each player. The same also applies to working hours. After the player has recorded his work input, it is also listed chronologically. A player can only see his own playing and working hours, while an administrator of the club can see the times of all players.