Why multiple color formats exist
Different color formats solve different communication problems. HEX is compact and common in CSS. RGB is intuitive when you think in red, green, and blue light values. HSL is often easier when you want to adjust hue, saturation, or lightness systematically instead of editing raw channel values.
When to use HEX
HEX is widely used in design handoff, CSS variables, and quick copy-paste workflows. It is compact and familiar, which makes it a convenient default format for many UI teams.
When RGB or HSL is more useful
RGB is useful when you need channel-level precision or when a browser tool already reports a color in red, green, and blue values. HSL is often easier for systematic theming because adjusting lightness or saturation is more direct than tweaking three RGB channels independently.