Great app

All I want is my rate at time of measurement. I have hereditary bradycardia, plus 5% PVCs (as measured with a Zio over 2 weeks by my cardiologist), so it's not going to be a simple result.The camera circle will not turn red, unless I backlight my finger with a 100W lightbulb, because my iPhone 16 Pro flash LED is useless. Anything less and no or bad results.It takes 25 seconds before revealing ANY information, but continues measuring for 45 seconds total. It says my (resting) rate is 48, so it reports bradycardia. Testing shows this means below 60; not adjustable.If I exercise first, my rate starts at 68, but it falls to 49 over 45 seconds, showing waveform with each interval in milliseconds, but only after 25 seconds. It reports 63 because apparently that's the average. Variation number is garbage. No range. It does say percent normal rate, percent bradycardia.The low app rating is because the app works at all, but it needs an external *bright* light, ll; it is too slow, and its calculations are suspect. At least it doesn't need an external pulse oximeter.Other apps demand a $100 subscription before they will do ANYTHING, or money up front before they will perform a basic test. Best so far of a bad lot. Damnation with faint praise.