The Hazardous Substances Rapid Information System (GSA) is a component of the GSBL which contains relevant chemical material data specifically for rescue services. In 2014, a view designed especially for fire brigades, specialist consultants and rescue services for display on PCs was developed in cooperation with the IBK (Institut für Brand- und Katastrophenschutz, based in Heyrothsberge). The financing was carried out by the Bundesamt für Bevölkerungsschutz und Katastrophenhilfe (BBK).

This was the occasion for the UBA to commission the development of a mobile version specially tailored to the needs of firefighters. This mobile version allows users to efficiently search offline for information held on 16000 substances. GSAapp can be installed on smartphones and tablets with the operating systems Android and iOS (Apple). The app has been made available to emergency crews since September 2014 and can be downloaded free of charge from the GSBL Access Service page for registered and eligible users of the cooperation partners.
The structure of the GSA app was deliberately kept very simple and is limited to a few pages in order to make it easy to use during response operations.