#666B78 Hex Color
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Storm-cloud grey comes to mind. #666b78 is a dark, almost grey blue with ashy undertones and low saturation, which keeps it subdued rather than vivid. It works best as a supporting tone in a 60/30/10 layout, or as a background for finance, tech, and government interfaces where restraint reads as trustworthy. Warm ochre or dusty terracotta offsets its cool cast nicely. White text clears WCAG AA on it at about 5.3:1 contrast.
Questions about #666b78
What is #666b78 in RGB, HSL and CMYK?
In RGB, #666b78 is rgb(102, 107, 120), in HSL hsl(223, 8%, 44%) and in CMYK 15%, 11%, 0%, 53%.
What colors pair well with #666b78?
Warm ochre, terracotta, and soft cream offset its cool grey cast. Use it as the 30% supporting tone and let lighter neutrals carry most of the palette.
Is #666b78 readable on white or black?
#666b78 has a 5.33:1 contrast ratio on white and 3.93:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works for body text and on black it works only for large text (24px, or 18.5px bold). Try other pairs in the contrast checker.