Easy to use, price worthy, accurate
An app that is easy to use and offers the option to measure for 60 seconds or as long as you wish, to get more accurate results. Regarding accuracy the app performs at the same level as my activity watch (which obviously measures on the wrist, also using the same method, light sensor) as well as a blood pressure machine and manual measurement performed with fingers on the side of the throat. It also gives the same result as an activity watch with a chest strap, so I put it to the test! Also very cheap but fully functional running on ads.