What looked like a good app is actually OUT OF DATE and makes a CRITICAL MISTAKE by totally ignoring calling 9-1-1/AED (both of which are ESSENTIAL!). The NEW depth is at least 2" for adult victims (over puberty) and 2" for children over 1 year old, and 1/3 depth of chest or 1.5" for infants. The instructions to "Look, Listen and Feel" are OUTDATED. Your order needs correcting!
What could have been a good app is dangerously misleading due to NOT calling 9-1-1/getting (or requesting) an AED BEFORE starting CPR on an adult victim. It IS true that you give CPR/rescue care for 2 minutes if alone with children/infants (unless sudden collapse NOT related to a respiratory emergency), THEN call 9-1-1.
Having taught over 40,000 students, I'm not trying to be critical--please consider redoing/following the 2010 Guidelines by the American Heart Association and verify step-by-step and you'll have a good app.
For the person who said you don't do breaths anymore, that's true if you have no PPE (personal protective equipment), too much facial trauma or you are untrained/unwilling to breath on a stranger's face; but for children, infants, choking/drowning victims of all ages, breathing is required. Carry a face shield/glove pack on a key chain or keep with you but breathing IS still taught. GOOD LUCK and I'll check back soon for corrected update!