UX/UI Design: Foundations to Practice · Visual Design Principles
Color Theory and Accessibility
Color choices in a digital product are not purely aesthetic decisions; they carry real functional consequences for usability and, for a meaningful share of users, real accessibility consequences that a color choice made purely on visual preference can easily overlook.
Color in a well-designed product carries genuine functional meaning, a specific color consistently indicating an error, a different specific color consistently indicating success or confirmation, and this functional use of color depends entirely on consistency; a color used to mean one thing in one part of a product and something different elsewhere undermines the very signal value color is meant to provide in the first place.
- Color carries genuine functional meaning in a well-designed product, but this depends entirely on consistency; a color meaning different things in different places undermines its own signal value.
- Critical information should never rely on color alone, since color vision deficiency affects a meaningful share of users; pairing color with an icon or text label preserves accessibility.
- Sufficient contrast between text and background matters for everyone, not just those with color vision deficiency, which is why measurable contrast ratio standards exist.
- A deliberate, limited color palette with consistent functional roles is easier for users to learn than an unconstrained, growing palette that dilutes color's signal value.