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Recognised as Colour

#183B91

  • #183B91
  • Blue
  • Dark
  • Nearest: Dark slateblue

#183B91 is a blue with RGB values 24, 59, 145 and HSL 223°, 72%, 33%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#183B91#183B91
HEX#183B91
RGBrgb(24, 59, 145)
RGB (0–1)0.0941, 0.2314, 0.5686
RGB percentages9.4%, 23.1%, 56.9%
HSLhsl(222.6, 71.6%, 33.1%)
HSV / HSBhsv(222.6, 83.4%, 56.9%)
CMYK83.4%, 59.3%, 0%, 43.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,113
CSS custom property--colour: #183B91;

Brightness & contrast

Relative luminance0.05366WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.13:1
Contrast with white10.13:1WCAG normal text: AAA
Contrast with black2.07:1WCAG normal text: Fail
Greyscale equivalent#3A3A3A
Inverted#E7C46E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004794no red cones; affects about 1% of men; ΔE 9.8 from the original
Deuteranopia#003C8Fno green cones; the most common form, about 1% of men; ΔE 3.1 from the original
Tritanopia#005160no blue cones; rare, and affects men and women equally; ΔE 51.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.13:1WCAG large text: AAA
Contrast with black, large text2.07:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10.4Midnight blue · ΔE 15.7Rebecca purple · ΔE 22.3Slate blue · ΔE 23.8Royal blue · ΔE 25.1Indigo · ΔE 31.2
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#916E18
Analogous#187791, #321891
Triadic#91183B, #3B9118
Split complementary#913118, #789118
Tetradic#911877, #916E18, #189131

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#89A6EC
Lighter +30%#5E85E4
Lighter +20%#3263DD
Lighter +10%#1F4DBD
Darker −10%#112965
Darker −20%#0A1739
Darker −30%#02060E
Darker −40%#000000
More saturated +25%#0332A6
Less saturated −25%#2D447C

Channel breakdown

R24
G59
B145
Red24 (9.4%)
Green59 (23.1%)
Blue145 (56.9%)
Hue222.64°
Saturation (HSL)71.6%
Lightness33.14%
Dominant channelBlue
Hex per channelR 18 · G 3B · B 91

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Every value on this page was computed from “183b91” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.