Sensitive, seemingly accurate

Holding the finger in just the right way takes some getting used to. It takes about 12 to 15 tries for me to get one heart rate recorded. In the middle of a workout, this means that heart rate has decreased while standing still. Nonetheless, a useful albeit frustrating app. Amazing that technology like this exists.

Archer 射手 about Runtastic Heart Rate PRO, v2.0.1