Klapp is a simple and intuitive solution that simplifies and digitalizes the communication between school parents and students. Klapp allows the transmission of messages and files in private messages or as a chat. School appointments and absence messages are clearly displayed in the calendar which can also be synchronized with the local calendar app. Video conferencing is integrated into Klapp. Printed letters chain telephones information booklets absence notification via phone and a clogged pinboard are a thing of the past.