#3663A5 Hex Color
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#3663a5 is a cool, moderately muted blue with gray undertones and medium-dark lightness. It communicates trust and reliability without feeling harsh, making it useful for finance, healthcare, technology, and government branding. Use it as a supporting or dominant interface color with white text, which reaches about a 6.0:1 contrast ratio. The hex code is #3663a5.
Questions about #3663a5
What is #3663a5 in RGB, HSL and CMYK?
In RGB, #3663a5 is rgb(54, 99, 165), in HSL hsl(216, 51%, 43%) and in CMYK 67%, 40%, 0%, 35%.
What colors pair well with #3663a5?
It pairs well with white, light gray, charcoal, and muted warm accents such as terracotta, because these choices balance its cool blue base without overpowering it in layouts or interfaces. Use pale neutrals for backgrounds and warm accents sparingly.
Is #3663a5 a warm or cool color?
#3663a5 reads as a cool, moderately muted blue because its hue sits firmly in the blue range and its gray undertones temper its saturation, giving the shade a composed, dependable character rather than a vivid or icy appearance.
Is #3663a5 readable on white or black?
#3663a5 has a 6.02:1 contrast ratio on white and 3.48:1 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.