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Recognised as Colour

#183D85

  • #183D85
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183D85 is a blue with RGB values 24, 61, 133 and HSL 220°, 69%, 31%. It is a dark colour, so white text on it reaches 10.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183D85#183D85
HEX#183D85
RGBrgb(24, 61, 133)
RGB (0–1)0.0941, 0.2392, 0.5216
RGB percentages9.4%, 23.9%, 52.2%
HSLhsl(219.6, 69.4%, 30.8%)
HSV / HSBhsv(219.6, 82%, 52.2%)
CMYK82%, 54.1%, 0%, 47.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,613
CSS custom property--colour: #183D85;

Brightness & contrast

Relative luminance0.05225WCAG 2.x, 0 is black and 1 is white
Perceived brightness66.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.27:1
Contrast with white10.27:1WCAG normal text: AAA
Contrast with black2.05:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E7C27A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#084688no red cones; affects about 1% of men; ΔE 7.2 from the original
Deuteranopia#003C84no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#004F5Bno blue cones; rare, and affects men and women equally; ΔE 44.2 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.27:1WCAG large text: AAA
Contrast with black, large text2.05:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.6Midnight blue · ΔE 20.9Rebecca purple · ΔE 28.4Slate blue · ΔE 30.7Royal blue · ΔE 31.4Steel blue · ΔE 33.8
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.58, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#856018
Analogous#187485, #291885
Triadic#85183D, #3D8518
Split complementary#852918, #748518
Tetradic#851874, #856018, #18852A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#81A4E8
Lighter +30%#5685E0
Lighter +20%#2A66D9
Lighter +10%#2051B0
Darker −10%#10295A
Darker −20%#08152F
Darker −30%#010203
Darker −40%#000000
More saturated +25%#043799
Less saturated −25%#2C4371

Channel breakdown

R24
G61
B133
Red24 (9.4%)
Green61 (23.9%)
Blue133 (52.2%)
Hue219.63°
Saturation (HSL)69.43%
Lightness30.78%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 85

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Every value on this page was computed from “183d85” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.