#3f6378 - Mallard Blue color

A cool, muted slate-blue with subtle teal undertones, this color feels both oceanic and sophisticated. It evokes calm, stability, and a hint of evening sky—serene yet assertive. Ideal for interiors, corporate identities, and UI backgrounds where professionalism and tranquility are desired. It pairs beautifully with warm creams, brass or wood accents, and brighter coral or mustard highlights for contrast. Works well in matte fabrics, painted walls, or metallic finishes for a refined, modern palette.

#3f6378 color RGB value is 63, 99, 120, and the CMYK value is 0.475, 0.175, 0.00, 0.529. Alternative names for that color are: mallard blue, gray, slategray, blue bayoux, outer space, indigo, slategrey.

Open Color Palette Builder Open Color Wheel

Color Conversion

Name	Values	CSS
RGB(0-255)	63, 99, 120	rgb(63, 99, 120)
CMYK	0.475, 0.175, 0.00, 0.529	-
sRGB	0.247, 0.388, 0.471	rgb(24.7%, 38.8%, 47.1%)
Adobe® 98 RGB compatible	0.301, 0.388, 0.465	color(a98-rgb, 0.301, 0.388, 0.465)
HCT	235, 25.0, 40.1	color(--hct, 235, 17.3%, 40.1%)
HSL	202, 31.1, 35.9	hsl(202, 31.1%, 35.9%)
HSV	202, 47.5, 47.1	color(--hsv, 202, 47.5%, 47.1%)
HWB	202, 24.7, 52.9	hwb(202, 24.7%, 52.9%)
Lab	39.9, -8.72, -16.1	lab(39.9%, -8.72, -16.1)
P3	0.278, 0.385, 0.462	color(display-p3, 0.278, 0.385, 0.462)
XYZ D50	0.0966, 0.112, 0.147	color(xyz-d50, 0.097, 0.112, 0.147)