The user can view the substitutions of St. Leonhard Gymnasium, Couven Gymnasium and Kaiser-Karls-Gymnasium. All information are stored offline, so that no internet is needed once synchronised. The substitutions are presented in one app and the same layout, which is especially usefull for students that visit both schools for classes. The substitutions can be filtered to show only events with the same class, school, teacher or even the personal schedule. Optionally the app notifies the user of recent changes, so that he does not have to check himself.