Blood pressure monitor from iOS / Android applications

I like to know the concept of blood pressure monitoring applications in iOS / Android stores. Does he really use any sensors to monitor BP, or is it a fun app to display random values? What is the concept of this? I traveled a lot, but no luck. If anyone knows share it with me.

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I think the applications you mentioned do not measure blood pressure, but heart rate. A smartphone cannot measure blood pressure without an external device. However, you can measure your heart rate using a smartphone. The concept is explained here: http://www.ignaciomellado.es/blog/Measuring-heart-rate-with-a-smartphone-camera

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