A full fitness checkup from a 30-second selfie

Anura is a general wellness app that uses your iPhone’s video camera to measure, track and record your resting heart rate and stress level based on the blood flow in your face.
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2 Reviews2.5/5
This looks great but not available in the UK / Ireland?
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I love this app! I've used it to make some great insights, and it seems very accurate compared to similar apps. Been using it for months.
This would actually be quite fun to use. Is there any studies on how accurate this facial blood flow tracking is compared to traditional methods?