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Dark Mode Toggles: Two States Are Enough

Dark Mode Toggles: Two States Are Enough

Design Lea Verou
Complex tri-state UI controls for dark mode are unnecessary when a simple binary toggle can effectively handle system, light, and dark preferences.
What: Lea Verou argues that developers should stop over-engineering dark mode interfaces, as a two-state toggle is sufficient to switch between user-defined and system-level themes.
Why it matters: This highlights a broader design principle where simplifying interface controls improves usability by reducing cognitive load without sacrificing functionality.
Original article

A two-state dark mode toggle can express all three underlying states, making the common tri-state control unnecessary UI complexity.

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