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Recognised as Colour

#183D57

  • #183D57
  • Blue
  • Dark
  • Nearest: Dark slate grey

#183D57 is a blue with RGB values 24, 61, 87 and HSL 205°, 57%, 22%. It is a dark colour, so white text on it reaches 11.4:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#183D57#183D57
HEX#183D57
RGBrgb(24, 61, 87)
RGB (0–1)0.0941, 0.2392, 0.3412
RGB percentages9.4%, 23.9%, 34.1%
HSLhsl(204.8, 56.8%, 21.8%)
HSV / HSBhsv(204.8, 72.4%, 34.1%)
CMYK72.4%, 29.9%, 0%, 65.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,567
CSS custom property--colour: #183D57;

Brightness & contrast

Relative luminance0.0422WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.39:1
Contrast with white11.39:1WCAG normal text: AAA
Contrast with black1.84:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#E7C2A8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#313D58no red cones; affects about 1% of men; ΔE 7.1 from the original
Deuteranopia#293757no green cones; the most common form, about 1% of men; ΔE 8.3 from the original
Tritanopia#004346no blue cones; rare, and affects men and women equally; ΔE 18.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.39:1WCAG large text: AAA
Contrast with black, large text1.84:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 19Dim grey · ΔE 28.2Slate grey · ΔE 29.9Steel blue · ΔE 30.8Black · ΔE 31.4Light slate grey · ΔE 32.7
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 19, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#573218
Analogous#185752, #181D57
Triadic#57183D, #3D5718
Split complementary#57181D, #575218
Tetradic#521857, #573218, #1E5718

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#66A7D5
Lighter +30%#3E90CA
Lighter +20%#2E75A7
Lighter +10%#23597F
Darker −10%#0D212F
Darker −20%#020507
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0A3F65
Less saturated −25%#263B49

Channel breakdown

R24
G61
B87
Red24 (9.4%)
Green61 (23.9%)
Blue87 (34.1%)
Hue204.76°
Saturation (HSL)56.76%
Lightness21.76%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 57

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Every value on this page was computed from “183d57” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.