The visual theme allowing the system-wide display and specific email applications to render user interfaces with predominantly dark backgrounds and light-colored text on iOS devices. When activated, elements of the operating system, including native applications like Mail, as well as compatible third-party email clients, adopt this inverted color scheme. This is activated at the system level and can be adopted by email applications.
Dark themes reduce eye strain, especially in low-light environments, and potentially conserve battery power on devices with OLED or AMOLED screens. The introduction of this visual customization reflected a growing user demand for more comfortable and personalized digital experiences. It represents a shift towards accessibility and user well-being within the mobile ecosystem.