2025-08-22 00:00:00 With the latest version of the TC 1899 e.V. Blau-Weiss member app, you always have all the relevant club information and contacts at hand in one place. Book and cancel your tennis courts, buy tickets for events, change your contact details with just a few clicks, manage your children's data if you wish, and much more is now available compactly via our app. The most important functions at a glance: - Team area: Receive only the news that is really relevant to you or your family and use the group chat or other communication options to exchange ideas with other members if they have approved this.