Background: Smartphone Alerting Systems (SAS) for first responders potentially shorten the resuscitation-free interval of patients with acute cardiac arrest. During the COVID-19 pandemic, many systems were suspended due to potential risks for the responders. Therefore, a COVID-19 concept for the SAS in Freiburg/Germany was established and evaluated. Methods: Due to the pandemic, SAS was stopped in March 2020. A concept for a safe restart was elaborated with provision of a set with ventilation bag/mask, airway filter and personal protective equipment (PPE) for every volunteer. A standard operating procedure followed the COVID-19 guidelines of the European Resuscitation Council (ERC). Willingness of the participants to respond alarms during the pandemic was investigated using an online survey. Results: The system was restarted in May 2020. The willingness to respond to alarms was lower during the pandemic without PPE. It remained lower than before the pandemic when the volunteers had been equipped with PPE, but the alarm response rate remained at approximately 50% during the ongoing pandemic. Conclusions: When volunteers are equipped with PPE, the operation of a SAS does not need to be paused, and the willingness to respond remains high among first responders.