This Cognixia Podcast episode explores the popular "dark mode" feature in apps and devices. Originating from the energy-efficient CRT displays of the 70s, dark mode has evolved into a sought-after feature for reducing eye strain and saving battery life, particularly on OLED screens. It reduces visual fatigue in dim environments and minimizes blue light exposure, aiding better sleep. Developers face challenges in designing effective dark modes, balancing contrast, accessibility, and brand identity. Despite some drawbacks, like halation effects, dark mode enhances inclusivity for users with light sensitivity or impairments. It's a thoughtful, multi-layered feature, combining science, design, and user experience.