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Recognised as Colour

#181DE5

  • #181DE5
  • Blue
  • Dark
  • Nearest: Medium blue

#181DE5 is a blue with RGB values 24, 29, 229 and HSL 239°, 81%, 50%. It is a dark colour, so white text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Medium blue.

Colour values

#181DE5#181DE5
HEX#181DE5
RGBrgb(24, 29, 229)
RGB (0–1)0.0941, 0.1137, 0.898
RGB percentages9.4%, 11.4%, 89.8%
HSLhsl(238.5, 81%, 49.6%)
HSV / HSBhsv(238.5, 89.5%, 89.8%)
CMYK89.5%, 87.3%, 0%, 10.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,580,517
CSS custom property--colour: #181DE5;

Brightness & contrast

Relative luminance0.0673WCAG 2.x, 0 is black and 1 is white
Perceived brightness81.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.95:1
Contrast with white8.95:1WCAG normal text: AAA
Contrast with black2.35:1WCAG normal text: Fail
Greyscale equivalent#2A2A2A
Inverted#E7E21A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0054EAno red cones; affects about 1% of men; ΔE 33.1 from the original
Deuteranopia#003EE2no green cones; the most common form, about 1% of men; ΔE 20.2 from the original
Tritanopia#006488no blue cones; rare, and affects men and women equally; ΔE 103.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.95:1WCAG large text: AAA
Contrast with black, large text2.35:1WCAG large text: Fail

Named colours

Medium blue · ΔE 7.1Blue · ΔE 18.1Blue violet · ΔE 23.3Dark violet · ΔE 27.8Dark blue · ΔE 35Dark orchid · ΔE 37
Nearest named CSS colourMedium blue (#0000CD)ΔE 7.15, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#E5E018
Analogous#1884E5, #7918E5
Triadic#E5181D, #1DE518
Split complementary#E57918, #84E518
Tetradic#E51884, #E5E018, #18E579

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFD0FA
Lighter +30%#A1A3F5
Lighter +20%#7376F0
Lighter +10%#4549EB
Darker −10%#1317B7
Darker −20%#0E1189
Darker −30%#090B5B
Darker −40%#05062C
More saturated +25%#0006FD
Less saturated −25%#383BC5

Channel breakdown

R24
G29
B229
Red24 (9.4%)
Green29 (11.4%)
Blue229 (89.8%)
Hue238.54°
Saturation (HSL)81.03%
Lightness49.61%
Dominant channelBlue
Hex per channelR 18 · G 1D · B E5

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Every value on this page was computed from “181de5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.