Magical heart rate monitor iPhone app


Using just the camera on your iPhone, the Cardiio app can accurately measure your heart rate. Here’s how it works:

Every time your heart beats, more blood is pumped into your face. This slight increase in blood volume causes more light to be absorbed, and hence less light is reflected from your face. Using sophisticated software, your iPhone’s front camera can track these tiny changes in reflected light that are not visible to the human eye and calculate your heart beat!

This video shows this process in action (with a short explanatory intro of the mathematical technique):

That is flat-out amazing. (via @delfuego)

29 notes


  1. iashly reblogged this from weliveinthefuture
  2. itsdds reblogged this from jkottke
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  6. mudl reblogged this from jkottke and added:
    One more step towards a real life tricorder. (In case you don’t know what a tricorder is, click here.)
  7. allemaaldingen reblogged this from jkottke and added:
  8. accidentalocean reblogged this from nuevocapitulo and added:
    Incredible stuff. It’s quite mind-boggling what just a phone can do these days.
  9. nuevocapitulo reblogged this from ahandsomestark and added:
    The motion amplification with the different oscillating orbs. That got me good.
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