Apple Watch is pretty great at measuring heart rate in my experience. Part of the difference may be the circumstances in which the measurement is taken—in the clinic, &quot;resting heart rate&quot; is typically measured when the patient is sitting, in a controlled setting.<p>For an app like Cardiogram, your heart rate is being measured throughout your day, &quot;in the wild,&quot; every 10 minutes. We do filter out any measurements taken while you were moving (walking, during a workout) and for a few minutes after the movement stops.<p>But, of course, your heart rate might be higher in real life than it is at the doctor&#x27;s office. Maybe you&#x27;ve just had coffee. Or you&#x27;re stressed out driving in traffic. For example, here&#x27;s mine in bay area traffic: <a href="https:&#x2F;&#x2F;twitter.com&#x2F;bballinger&#x2F;status&#x2F;695704441626886145" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;bballinger&#x2F;status&#x2F;695704441626886145</a><p>In Cardiogram itself, we show the user their whole distribution of resting heart rates. What&#x27;s reported in the blog post is the median of all those measurements.<p>By the way, I don&#x27;t think it&#x27;s known what the &quot;right&quot; answer is here. We do know stress can trigger a heart attack, and coffee can trigger arrhythmias like atrial fibrillation. So perhaps there&#x27;s a lot of information lurking in the shape of your personal distribution of heart rates. But before now, nobody has really had the data to answer these types of questions.