Fairly accurate

I tested it with my blood pressure n pulse monitor at home n it was very close to it. The rear camera with light on is the one with the most accurate reading. The front camera needs u to be near bright light. If you have an iDevice that doesnt have a flash use it near a bright source of light to get accurate reading. I use it at gym and at home to monitor my pulse.

Alexander Shaw about Cardiograph Classic, v2.5.4