At least there is in San Ramon, California.
Here’s how it works: locals download the free app and enable the CPR alert. In the event of a cardiac emergency, once 911 has been called and paramedics dispatched, the app also alerts people who may be nearby to intervene.
Keeping in mind the potential legal implications of citizen intervention, the app reminds people who sign up to “respond in a safe, responsible and respectful manner.”
Using the phone’s GPS, a map tells the user where the victim is and the location of the nearest automated external defibrillator (AED). The user would then go to the person and help until the fire department arrives.
A better app would be one that gives reminders on how to administer CPR. Beeping at the proper compression rate (“Stayin’ Alive tempo), advising when to break to breathe into the patient’s mouth, etc.