5 stars: I'm a post Covid patient with damaged lungs. I love having this app available to check both my oxygen saturation and my heart rate! Much more convenient than my oximeter that goes on my finger. Also, I've compared this app with my finger pulse oximeter, and they both measure within a point of each other.
4 stars: I have been using the app for a week, I must say that it is easy to use, and it's very good. The only thing that can be improved is the accuracy and the visual looks of the app.
5 stars: If your device supports it (Samsung Note 4 through 9 and Galaxy S6 through S10 according to the developer), this app is an improvement over Samsung Health's pulse ox module - it provides a history, which can be exported (a premium feature, but not expensive). Plus it's quick to use and can be calibrated to some extent (though I haven't done this myself).
3 stars: It frequently starts to measure and then stops. I have tried re- boot with little success. It usually starts fine begins to show blood gas etc and then says it is searching and then it tells me to try again. I always have my finger in the correct place. It completes the diagnosis about one time in ten. I don't move my finger when measuring
4 stars: It gives accurate pulse readings, I double checked it with my gear active. I'm not sure how accurate the O2 readings are, but I assume they're within range. I downloaded this app to monitor myself because I caught covid. It has been helpful to keep my wife...