Evidence guide · 6 min read
How to check heart rate with your phone camera
No watch, no strap: how a camera sees your pulse, how accurate it really is, and how to get a clean reading.
Reviewed by Pulselens editorial · Updated 27 September 2026
Every heartbeat pushes a little more blood into the skin, changing its colour by a fraction too small to see. A phone camera recording 30 frames a second can detect that rhythm.
Two ways to do it
- Face scan: contact-free, reads forehead and cheeks; can also estimate breathing rhythm.
- Fingertip: cover the rear camera and flash; stronger signal but easy to press too hard.
How accurate is it?
In still, well-lit conditions, research reports camera heart rate typically within about 2–5 bpm of ECG or chest straps. Accuracy drops with movement, dim or flickering light, strong backlight and video compression.
6 tips for a reliable reading
- Face a window or soft lamp — light in front, not behind.
- Rest the phone on something stable at eye level.
- Sit for a minute first and don't talk.
- Remove glasses that reflect light if possible.
- Keep your whole face in the frame.
- Repeat at the same time of day to compare.
Sources
Private on-device measurement
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