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Recognised as Colour

#181EA1

  • #181EA1
  • Blue
  • Dark
  • Nearest: Dark blue

#181EA1 is a blue with RGB values 24, 30, 161 and HSL 237°, 74%, 36%. It is a dark colour, so white text on it reaches 12.1:1 contrast (AAA for normal text). The nearest named colour is Dark blue.

Colour values

#181EA1#181EA1
HEX#181EA1
RGBrgb(24, 30, 161)
RGB (0–1)0.0941, 0.1176, 0.6314
RGB percentages9.4%, 11.8%, 63.1%
HSLhsl(237.4, 74.1%, 36.3%)
HSV / HSBhsv(237.4, 85.1%, 63.1%)
CMYK85.1%, 81.4%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,705
CSS custom property--colour: #181EA1;

Brightness & contrast

Relative luminance0.03696WCAG 2.x, 0 is black and 1 is white
Perceived brightness60.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 12.07:1
Contrast with white12.07:1WCAG normal text: AAA
Contrast with black1.74:1WCAG normal text: Fail
Greyscale equivalent#262626
Inverted#E7E15E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#003DA5no red cones; affects about 1% of men; ΔE 22 from the original
Deuteranopia#002F9Fno green cones; the most common form, about 1% of men; ΔE 13.4 from the original
Tritanopia#004860no blue cones; rare, and affects men and women equally; ΔE 74.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text12.07:1WCAG large text: AAA
Contrast with black, large text1.74:1WCAG large text: Fail

Named colours

Dark blue · ΔE 9.2Navy · ΔE 10.8Indigo · ΔE 17Rebecca purple · ΔE 24.4Midnight blue · ΔE 25Slate blue · ΔE 27.2
Nearest named CSS colourDark blue (#00008B)ΔE 9.19, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A19B18
Analogous#1863A1, #5618A1
Triadic#A1181E, #1EA118
Split complementary#A15618, #63A118
Tetradic#A11863, #A19B18, #18A156

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#969AEF
Lighter +30%#696FE9
Lighter +20%#3D44E2
Lighter +10%#1F26CD
Darker −10%#111675
Darker −20%#0B0D48
Darker −30%#04051C
Darker −40%#000000
More saturated +25%#0109B8
Less saturated −25%#2F338A

Channel breakdown

R24
G30
B161
Red24 (9.4%)
Green30 (11.8%)
Blue161 (63.1%)
Hue237.37°
Saturation (HSL)74.05%
Lightness36.27%
Dominant channelBlue
Hex per channelR 18 · G 1E · B A1

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Every value on this page was computed from “181ea1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.