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Recognised as Colour

#3991CD

  • #3991CD
  • Blue
  • Dark
  • Nearest: Steel blue

#3991CD is a blue with RGB values 57, 145, 205 and HSL 204°, 60%, 51%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#3991CD#3991CD
HEX#3991CD
RGBrgb(57, 145, 205)
RGB (0–1)0.2235, 0.5686, 0.8039
RGB percentages22.4%, 56.9%, 80.4%
HSLhsl(204.3, 59.7%, 51.4%)
HSV / HSBhsv(204.3, 72.2%, 80.4%)
CMYK72.2%, 29.3%, 0%, 19.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,772,877
CSS custom property--colour: #3991CD;

Brightness & contrast

Relative luminance0.25528WCAG 2.x, 0 is black and 1 is white
Perceived brightness134.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.11:1
Contrast with white3.44:1WCAG normal text: Fail
Contrast with black6.11:1WCAG normal text: AA
Greyscale equivalent#838383
Inverted#C66E32

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7592D0no red cones; affects about 1% of men; ΔE 13.2 from the original
Deuteranopia#6184CCno green cones; the most common form, about 1% of men; ΔE 15 from the original
Tritanopia#00A0A6no blue cones; rare, and affects men and women equally; ΔE 36.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.44:1WCAG large text: AA
Contrast with black, large text6.11:1WCAG large text: AAA

Named colours

Steel blue · ΔE 8.4Deep skyblue · ΔE 19.2Cornflower blue · ΔE 19.6Light skyblue · ΔE 24.7Light slate grey · ΔE 27.7Slate grey · ΔE 28.6
Nearest named CSS colourSteel blue (#4682B4)ΔE 8.39, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CD7539
Analogous#39CDBF, #3947CD
Triadic#CD3991, #91CD39
Split complementary#CD3947, #CDBF39
Tetradic#BF39CD, #CD7539, #47CD39

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DCEBF6
Lighter +30%#B3D5EC
Lighter +20%#8ABEE2
Lighter +10%#62A8D7
Darker −10%#2B75A8
Darker −20%#205980
Darker −30%#163D57
Darker −40%#0C202E
More saturated +25%#1A97EC
Less saturated −25%#588BAE

Channel breakdown

R57
G145
B205
Red57 (22.4%)
Green145 (56.9%)
Blue205 (80.4%)
Hue204.32°
Saturation (HSL)59.68%
Lightness51.37%
Dominant channelBlue
Hex per channelR 39 · G 91 · B CD

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Every value on this page was computed from “3991cd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.