Spun off by biophysicist Dr. Emmanuel Dumont in 2016 after wearable UV-measurement research at Cornell Tech, Shade makes wearable UV sensors and connected software that track exposure in real time. Its clinical-grade device uses a proprietary semiconductor to measure the UV index down to 0.001, supporting both personal sun-awareness and dermatology research. Shade says its technology has been used by major research institutions and is backed by peer-reviewed studies and more than $5 million in funding.