Sag's Wien is a mobile application developed by Stadt Wien, designed to facilitate reporting concerns, dangerous spots, or faults to the Vienna city administration conveniently via smartphones. This app aims to enhance the interaction between citizens and the administration, fostering a more connected and engaged community.

Users can submit reports to the Vienna city administration swiftly and intuitively without the need for registration. The app allows viewing messages in list format, city map, or detailed view. Users can also support other messages or choose to follow them. Personalization is enabled through user profiles, making Sag's Wien accessible across various devices.