Founded in San Francisco, Castlight Health develops software aimed at simplifying healthcare complexities. Their core mission is to enable employers to deliver cost-effective benefits and guide members to better health and wellbeing. Castlight offers a suite of applications and services, including dashboards, reports, and analytics, that leverage data and machine learning for a personalized navigation experience. Their primary market focus is on employers and health plans in the United States.

Notable affiliated individuals include co-founders Giovanni Colella and Todd Park. The company has attracted significant investment from venture capital firms such as Venrock and Maverick Capital. Key achievements include developing a leading healthcare navigation platform and forming partnerships with major U.S. employers. Castlight Health's impact lies in its ability to streamline healthcare benefits management, ultimately helping organizations reduce costs and improve employee health outcomes.