The Supplementary Alerting Service (SAS) app, developed by the State of Victoria - Department of Justice, is an official app designed for career and volunteer emergency services personnel. This app serves as a supplement and connection to the existing Emergency Alerting System used by emergency service personnel across Victoria.

With SAS, users can receive notifications of emergencies, allowing them to stay informed and prepared. In addition, users can respond to emergencies and view other responders, along with their estimated time of arrival to the event. This feature enables efficient coordination and collaboration among emergency service personnel.

The app also provides a chat feature, allowing users to communicate with other agency users. This facilitates real-time information sharing and enhances communication during emergency situations.

One of the key features of SAS is the ability to forecast availability. This feature helps emergency service personnel plan and allocate resources effectively by providing insights into the availability of personnel.

SAS is a free app available on the iPhone platform. However, access to the app requires login details provided by the user's agency. It falls under the Utilities & Tools category, specifically catering to the needs of emergency service personnel.