PGG-Vertretungsplan is an iPhone app developed by Joern Kiefer that allows users to easily access the substitute schedule of Paul-Gerhardt-Gymnasium Lübben. Unlike accessing the schedule through the school's website, this app only requires users to enter their password once.

Designed specifically for use at Paul-Gerhardt-Gymnasium Lübben, this app provides a convenient way for students and teachers to stay updated on any substitute teachers or changes to their class schedules. The password for accessing the app is provided by the school, ensuring secure and authorized access.

With PGG-Vertretungsplan, users can quickly and effortlessly check the substitute schedule, making it easier to plan their day and stay informed about any changes. This app is a valuable tool for students and teachers at Paul-Gerhardt-Gymnasium Lübben.