Digital health is a broad spectrum of measurement technologies that include personal wearable devices and internal devices as well as sensors in people, homes, cars, and communities. Digital health can help identify health risks and assist with diagnosis, treatment, and monitoring of health and disease conditions1 and offers novel ways to capture continuous data on individuals and populations that complement the episodic data on individuals that are captured by current health care approaches. Digital health has potential to improve health management, but the current state of technology development and deployment requires a “buyer beware” cautionary note.