Colour

#181D37

#181D37
Blue
Dark
Nearest: Black

#181D37 is a blue with RGB values 24, 29, 55 and HSL 230°, 39%, 15%. It is a dark colour, so white text on it reaches 16.5:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#181D37#181D37

HEX#181D37

RGBrgb(24, 29, 55)

RGB (0–1)0.0941, 0.1137, 0.2157

RGB percentages9.4%, 11.4%, 21.6%

HSLhsl(230.3, 39.2%, 15.5%)

HSV / HSBhsv(230.3, 56.4%, 21.6%)

CMYK56.4%, 47.3%, 0%, 78.4%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,580,343

CSS custom property--colour: #181D37;

Brightness & contrast

Relative luminance0.01349WCAG 2.x, 0 is black and 1 is white

Perceived brightness31.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 16.54:1

Contrast with white16.54:1WCAG normal text: AAA

Contrast with black1.27:1WCAG normal text: Fail

Greyscale equivalent#1E1E1E

Inverted#E7E2C8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#132038no red cones; affects about 1% of men; ΔE 3.4 from the original

Deuteranopia#101E36no green cones; the most common form, about 1% of men; ΔE 3.4 from the original

Tritanopia#0C2227no blue cones; rare, and affects men and women equally; ΔE 17.8 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text16.54:1WCAG large text: AAA

Contrast with black, large text1.27:1WCAG large text: Fail

Named colours

Black · ΔE 22.2 Dark slate grey · ΔE 30.3 Dark slateblue · ΔE 36.6 Dim grey · ΔE 37.9 Midnight blue · ΔE 40.8 Slate grey · ΔE 42.7

Nearest named CSS colourBlack (#000000)ΔE 22.18, a distinctly different colour

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#373218

Analogous#182C37, #231837

Triadic#37181D, #1D3718

Split complementary#372318, #2C3718

Tetradic#37182C, #373218, #183723

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#616FBA

Lighter +30%#4655A2

Lighter +20%#37427E

Lighter +10%#27305B

Darker −10%#090A13

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#0E1641

Less saturated −25%#22242D

Channel breakdown

R24

G29

B55

Red24 (9.4%)

Green29 (11.4%)

Blue55 (21.6%)

Hue230.32°

Saturation (HSL)39.24%

Lightness15.49%

Dominant channelBlue

Hex per channelR 18 · G 1D · B 37

Keep nerding

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#181D37

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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