Color is the first thing people notice and the last thing they consciously think about. A well-built color system works invisibly — it creates consistency, communicates hierarchy, and reinforces brand recognition without calling attention to itself.
The difference between a palette and a system
A palette is a set of colors. A system is a set of rules for how those colors are used. Most organizations have a palette. Fewer have a system. A color system defines which color is primary, which is secondary, which is used for interactive elements, and which combinations are permitted.
Accessibility is not optional
A color system that does not account for contrast ratios is incomplete. The WCAG standard requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Building accessibility into the color system from the start is far easier than retrofitting it later.
Semantic color tokens
The most maintainable color systems use semantic tokens rather than literal color names. Instead of "blue-500," the token is "color-interactive" or "color-primary." This means that when the brand color changes, the token value changes and everything that uses the token updates automatically.