Low-light use cases define the requirements
Travel apps get used in conditions that most product teams do not test for: airplane cabins at 20% screen brightness, hotel rooms at midnight while a partner sleeps, and outdoor terminals with unpredictable glare. A dark mode palette for travel needs higher internal contrast between surface layers than a typical consumer app because users are often fatigued, distracted, or switching between the app and a bright boarding pass. Ocean Abyss provides the teal-to-deep-blue range that gives you four to five distinct surface levels without resorting to pure black, which washes out on OLED screens at low brightness.
