Cidadão Online is an Android application developed by Sonner Sistemas de Informática Ltda. that provides a mobile interface for citizens to communicate with public agencies. The app aims to make it easier for users to access important functionalities related to their needs with the agency.

The app features a user-friendly interface that allows users to easily navigate through the different sections. Users can access services such as issuing certificates, consulting tax debts, and tracking the status of their requests. Cidadão Online also allows users to send messages and documents to the agency, making it a convenient tool for communication.

Overall, Cidadão Online is a useful application for citizens who need to communicate with public agencies. Its mobile interface and easy-to-use functionalities make it a reliable tool for accessing important services and information.