/e/OS is an open-source mobile operating system based on Android, with a focus on privacy and user control. It is developed by the /e/foundation organization and is the default operating system for Murena smartphones, both of which are closely linked and share the same founder. Although /e/OS is based on Android, it is shipped without Google apps and services. Since many Android apps rely on Google Services in the background, /e/OS uses the open-source microG to emulate the Google API. This allows most Android apps to work seamlessly. /e/OS can be installed on over 200 Android smartphones from well-known manufacturers.