Dangerous scam
The ads or this app are honestly dangerous. The heart rate monitor is unreliable with a standard phone camera. The app has no way at all of monitoring blood pressure or blood oxygen levels. Always use a manual or automatic blood pressure pump to measure blood pressure and an oxymeter to measure oxygen levels. Apps like this can give a fake sense of safety and are DANGEROUS as older people often fall victim to ad campaigns like this and they might overlook serious health issues, possibly leading to an untimely death. The developers probably didn’t think this app was stupid enough, so they also added a subscription plan. Just use the iPhone’s free Health app for god’s sake.