You can try heart pulse here.
I thought I would create as an exercise a utility to measure heart rate on a desktop of mobile device. The idea is you hold one finger to your pulse and click a button a few times (at least two) and then, from there your heart rate can be approximated using the old
frequency = 1 / period formula. One important consideration was to make the pulse measuring button big. This is important for mobile users, but extra important since if the user misses the button they will get an inaccurate reading. Then I included a share link to help it spread through social media. Also, interestingly, this program also doubles as a music tempo measurement program as they both use the same unite (ie. beats per minute).