Using The iPhone’s Front-Facing Camera, Cardiio Measures Your Heartrate

I had an application that did this about a year ago. The results were a bit rubbish though. I wonder if it has improved and how it compares to this thing.

http://itunes.apple.com/us/app/vital-signs-camera-philips/id...

Is this based on Eulerian Video Magnification? See http://news.ycombinator.com/item?id=4062216