Android Beat has a great article about adding a heart rate monitor via an app to your smartphone. The recommended android apps are Runtastic Heart Rate (my favourite) or Instant Heart Rate.
Another reason not to buy the new Samsung Galaxy S5.
If you have an iPhone don’t panic, there are apps that do the same thing as well. A good app is Heart Rate Monitor.
Gavin's Gadgets & Photography 
How silly. No one would be so stupid as to buy £500 smartphone for one feature. And how accurate are these 3rd party apps? Why are tech articles becoming like trash British newspapers?
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If you read the article linked, it’s a doctor writing the piece who is well known. The apps are very accurate. I’ve got Runtastic Heart installed and tested by myself. It’s very good which surprised me. Samsung didn’t need to have a separate area to scan the heart rate either. Probably didn’t want fingers on the camera lens.
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Nobody is trashing anything. Sometimes the truth is the truth.
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Another reason not to buy the S5?
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