What can an App or a wearable tell you? Is it going to detect a tumor in your colon or your brain like a CAT scan? Can it diagnose you with a genetic disorder l

What can an App or a wearable tell you? Is it going to detect a tumor in your colon or your brain like a CAT scan? Can it diagnose you with a genetic disorder like being genotyped? You cannot only infer everything aspect of health from a single ultrasound scan, which is far more detailed. So what makes you think it would be possible with an App and a heart rate sensor?