Heart rate monitor
Worked ok with normal heart rate in resting position before exercise. After exercising, would not give a reading, even when trying all fingers and taking the protective cover off iPad to get better access to camera.
Not enough ratings yet to assess Heartbeat.
Heartbeat - Heart Rate Monitor appears to be a legitimate app. AppsHunter Legitimacy Score for Heartbeat is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.