Crowd Book: Zusammen schreiben is an innovative iPhone application designed for aspiring writers and readers alike. The platform allows users to create and contribute to stories collaboratively, with over 16,000 existing narratives authored by approximately 19,000 users. Writers can initiate their own stories after just one day, suggesting themes and titles, while readers can participate by providing suggestions for plot developments.

The app features a voting system that determines the best continuation of a story each day at 6 PM, ensuring that community engagement drives the narrative. Users can select unique usernames to enhance their visibility within the community, allowing them to showcase their contributions. Crowd Book supports multiple genres, including thriller, fantasy, horror, and science fiction, providing a diverse range of storytelling experiences for all users.