The ALERTABLU app provides real-time information about the Itajaí-Açu River, rainfall, and floods. It offers various features, including monitoring the river level and its surveillance status (attention, alert, and readiness). If the river level is in a state of readiness, the system will display the level forecast for the next hour. Users can also register locations to monitor, and if the location's level is within the predicted range, the app will send an alert to notify the user. The app also provides alerts for weather changes and landslides.

The app offers several functionalities, such as information about the river, floods, water levels, weather forecasts, and temperatures. Users can track rainfall at different stations in various regions of Blumenau. The app also provides contact information for the municipality and emergency services. Users can report incidents to the Civil Defense, including geolocation and photo submission. The app also allows users to search for shelters and find the nearest one using GPS, providing distance in meters, clickable phone numbers, and a link to Google Maps. Users can receive meteorological alerts with emergency information about upcoming rainfall. The app also provides information about rainfall conditions and the probability of landslides listed by regions, with descriptive states and color codes based on their levels. Additionally, users can receive traffic notifications, including information about traffic jams and the state of traffic in Blumenau.

The app has a new layout that is more visually appealing and offers improved usability. It aims to provide users with a better user experience and easier access to its features.

The app's privacy policies are not provided in the given text.