Kiebitz is an open source, free-to-use software system for vaccination appointment scheduling. It is designed according to Privacy By Design principles and systematically tries to minimize privacy & security risks for users of the system. Kiebitz can be operated very easily. Kiebitz also implements end-to-end encryption of sensitive data. An unprovoked decryption of personal data is not possible with Kiebitz, but the control over the data lies solely with data subjects and vaccinating physicians [^1]. In addition, Kiebitz systematically minimizes opportunities to collect and analyze meta-data, which also poses a significant privacy risk in appointment scheduling systems in addition to the actual data collected. We are convinced that Kiebitz is the most privacy-friendly vaccination appointment scheduling software.