This APP simply doesn't work. Just tried it out with one of my many CPR training dummies to no avail. I have a series 2 Apple Watch. Nor, does it meet AHA or Red Cross guidelines. I will be reporting this APP to the American Red Cross legal department for further review. As a Firefighter/Medic and BLS CPR instructor for both the Red Cross and AHA... I would recommend taking a FREE hands-only CPR class over relying on this app to perform proper CPR compressions during a medical emergency.
Untrained bystanders should still call 911 and provide Hands-Only CPR, or CPR without breaths, pushing hard and fast in the center of the chest to the rate of 100-120 compressions per minute.