#404b57 - Dark Night color

A muted, mid-to-dark slate blue-gray with cool undertones, evoking stormy seas and industrial steel. It reads as sophisticated and restrained, providing a calm, professional backdrop that still retains depth and subtle blue character. Pairs beautifully with warm metallics like copper or brass, soft creams, and mustard accents to add contrast, or with lighter blues and pale grays for a monochromatic palette. Ideal for UI backgrounds, branding, interior accents, or refined, maritime-inspired designs.

color #404b57

#404b57 color RGB value is 64, 75, 87, and the CMYK value is 0.264, 0.138, 0.00, 0.659. Alternative names for that color are: dark night, gray, darkslategray, river bed, outer space, indigo, darkslategrey.

Color Conversion

Name
Values
CSS
RGB(0-255)
64, 75, 87
rgb(64, 75, 87)
CMYK
0.264, 0.138, 0.00, 0.659
-
sRGB
0.251, 0.294, 0.341
rgb(25.1% 29.4% 34.1%)
Adobe® 98 RGB compatible
0.271, 0.299, 0.342
color(a98-rgb 0.271 0.299 0.342)
HCT
248, 13.3, 31.4
color(--hct 248 9.18% 31.4%)
HSL
211, 15.2, 29.6
hsl(211 15.2% 29.6%)
HSV
211, 26.4, 34.1
color(--hsv 211 26.4% 34.1%)
HWB
211, 25.1, 65.9
hwb(211 25.1% 65.9%)
Lab
31.3, -2.23, -8.68
lab(31.3 -2.23 -8.68)
P3
0.259, 0.293, 0.337
color(display-p3 0.259 0.293 0.337)
XYZ D50
0.0631, 0.0676, 0.0756
color(xyz-d50 0.063 0.068 0.076)

Shades

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Tints

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Tones

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Color Harmonies

HEX:#404b57
RGB:64 75 87
HSL:211.3deg 15.23% 29.61%
HEX:#574c40
RGB:87 76 64
HSL:31.3deg 15.23% 29.61%

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