Digital technology has empowered people worldwide to be more involved with and aware of their health, with a growing and rich collection of devices and information sources. However, has supply outpaced the demand? This TUPdate reports on the active usage of critical health devices and health-oriented activities. It details the number of online adults in the US, Germany, UK, and Germany who track their steps using a smartphone, uses a smartwatch or fitness tracker, or regularly search for health information online.