Google Fit, the company’s health tracking app that collects data for Android, Wear OS and iOS users, is the latest Google app to receive a dark theme option on Android. In dark theme, the usual black text on a white background is reversed to show white text on a black background; this prevents the user’s eyes from getting blinded by bright white light in dark rooms or at night. Google’s Material Design, used on its core apps, often leaves large patches of white background. As a result, dark theme has become a popular feature. Both Android Q and iOS 13 will include a “system-wide” dark mode when they are released later this year.