Yes it is a useful app. I am a doctor using this app on myself. I think the best way to detect Afib is with a long term cardiac monitor such as an event recoder. Doctors can best analyze the heart rythm witha 12 lead EKG with leads connected to various parts of the body. An alternative is a rhytm strip which records just one lead. Some watches can record a true rhythm strip by detecting the electrical voltage between two locations on the body, eg two hands. But if you do not have that technology available this Afib monitor is a good option. It records the pulse from the 'pulse oximeter' feature which is usually used to measure blood oxygen saturation. The light refected through the skin fluctuates as the blood vessels are filled with blood with every heart beat. The key is, that by examining this waveform you can see whether the beats are equally spaced. If not, you may be experiencing some kind of abnormal irregular heart rythm. If so you can seek more precise medical testing from a professional. So yes this is a valuable tool.The advertising on the free version is very obnoxious, covering the screen, without any way of clicking the adds off. Really horrible advertising of the worst kind and it totally dominates the app.

The little stress meter at the bottom that shows the little heart over “relaxed”, “normal”, “elevated”, or “High” Stress …. What is this measuring and what is it supposed to be telling me? I’ve looked on your website, on this App Store, and done extensive Internet search for info related to this app and can’t find anything that explains this. There’s times I have a 65-70 bpm heart rate, but still says my stress level is “high”. But I can’t find any info that tells me what that “high stress level” means. Is that stress on my heart? Is it measuring emotional stress? Is it measuring heart variability stress? Etc.

I was excited to find an app to check for AFib as I’ve been having heart palpitations however I was shocked that the app charges so much and there’s not even a trial to test it to see if it’s something I want to keep. Also, my heart rate has shown normal on all readings however a few of the show the heart rate in red. One I think is red colored as my heart rate was 55 and said bradycardia but im not sure about the other 3 and there’s no explanation for heart rates listed in red in the history. Can you reply with that info please??

after the most recent update it does do heart rhythm anymore they show a graph of you rhythm but it will no longer tell you "you dont have afib" or "you rythm is not normal you may have afib" i have been paying the subscription i don't expect to see major changes like this or features removed that weren't broken. I know ots not the most accurate of things but it does work at it is possible to get rythm from the constriction of blood vessels (thats how heart rate monitors work using the change in light from blood vessel constriction) please bring this back idk why it was removed its very unlikely you will get sued