#556699 - Harbor Blue color

Deep, muted steel-blue with cool slate-gray undertones. It reads as a composed, medium-dark blue — neither vibrant nor stark — evoking maritime calm, denim textures, and corporate reliability. Slight desaturation makes it sophisticated and versatile for backgrounds, navigation bars, or subdued accents. It pairs elegantly with warm creams, soft corals, mustard ochres, and brushed metal tones, offering readable contrast with white and pale grays while maintaining a restrained, modern atmosphere.

#556699 color RGB value is 85, 102, 153, and the CMYK value is 0.444, 0.333, 0.00, 0.400. Alternative names for that color are: harbor blue, gray, steelblue, waikawa gray, midnight blue, indigo.

Open Color Palette Builder Open Color Wheel

Color Conversion

Name	Values	CSS
RGB(0-255)	85, 102, 153	rgb(85, 102, 153)
CMYK	0.444, 0.333, 0.00, 0.400	-
sRGB	0.333, 0.400, 0.600	rgb(33.3%, 40%, 60%)
Adobe® 98 RGB compatible	0.355, 0.399, 0.588	color(a98-rgb, 0.355, 0.399, 0.588)
HCT	272, 34.4, 43.8	color(--hct, 272, 23.7%, 43.8%)
HSL	225, 28.6, 46.7	hsl(225, 28.6%, 46.7%)
HSV	225, 44.4, 60.0	color(--hsv, 225, 44.4%, 60%)
HWB	225, 33.3, 40.0	hwb(225, 33.3%, 40%)
Lab	43.5, 4.14, -30.3	lab(43.5%, 4.14, -30.3)
P3	0.346, 0.398, 0.585	color(display-p3, 0.346, 0.398, 0.585)
XYZ D50	0.136, 0.135, 0.242	color(xyz-d50, 0.136, 0.135, 0.242)