To take a measurement, a user simply puts their finger over the phone camera & flash for 2 minutes.

Welltory tracks the heartbeat with an optical technique called PPG, which is also used in fitness trackers. Then, the app runs the numbers through heart rate variability algorithms to produce biofeedback.

HRV is a health assessment method featured in about 20,000 research papers on PubMed and widely used by medical professionals to understand how stressed the body’s systems are, forecast people’s risk of developing a cardiovascular disease, improve workouts, and more.

Welltory’s camera measurements are as accurate as measurements taken with professional heart rate monitors, so research participants don’t need any extra gadgets to get started. All they have to do is download the app on their phones and start measuring.

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