#5566dd - Thick Blue color

This shade reads as a medium-deep periwinkle-blue with clear violet undertones. It feels vibrant but slightly softened, bridging bold cobalt and gentle lavender. The tone suggests twilight skies, rich indigo denim, or a contemporary brand accent that’s lively without overpowering. It pairs well with warm neutrals, soft creams, pale blush, or muted gold for contrast. Use it for buttons, headlines, or accents when you want a confident, slightly playful cool-blue presence.

#5566dd color RGB value is 85, 102, 221, and the CMYK value is 0.615, 0.538, 0.00, 0.133. Alternative names for that color are: thick blue, indigo, royalblue, royal blue, blue.

Open Color Palette Builder Open Color Wheel

Color Conversion

Name	Values	CSS
RGB(0-255)	85, 102, 221	rgb(85, 102, 221)
CMYK	0.615, 0.538, 0.00, 0.133	-
sRGB	0.333, 0.400, 0.867	rgb(33.3%, 40%, 86.7%)
Adobe® 98 RGB compatible	0.355, 0.399, 0.850	color(a98-rgb, 0.355, 0.399, 0.85)
HCT	280, 61.9, 47.8	color(--hct, 280, 42.7%, 47.8%)
HSL	233, 66.7, 60.0	hsl(233, 66.7%, 60%)
HSV	233, 61.5, 86.7	color(--hsv, 233, 61.5%, 86.7%)
HWB	233, 33.3, 13.3	hwb(233, 33.3%, 13.3%)
Lab	46.9, 22.1, -64.2	lab(46.9%, 22.1, -64.2)
P3	0.346, 0.398, 0.838	color(display-p3, 0.346, 0.398, 0.838)
XYZ D50	0.194, 0.159, 0.530	color(xyz-d50, 0.194, 0.159, 0.53)