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Recognised as Colour

#223F9B

  • #223F9B
  • Blue
  • Dark
  • Nearest: Dark slateblue

#223F9B is a blue with RGB values 34, 63, 155 and HSL 226°, 64%, 37%. It is a dark colour, so white text on it reaches 9.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#223F9B#223F9B
HEX#223F9B
RGBrgb(34, 63, 155)
RGB (0–1)0.1333, 0.2471, 0.6078
RGB percentages13.3%, 24.7%, 60.8%
HSLhsl(225.6, 64%, 37.1%)
HSV / HSBhsv(225.6, 78.1%, 60.8%)
CMYK78.1%, 59.4%, 0%, 39.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,244,507
CSS custom property--colour: #223F9B;

Brightness & contrast

Relative luminance0.06262WCAG 2.x, 0 is black and 1 is white
Perceived brightness73.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.32:1
Contrast with white9.32:1WCAG normal text: AAA
Contrast with black2.25:1WCAG normal text: Fail
Greyscale equivalent#3F3F3F
Inverted#DDC064

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004D9Eno red cones; affects about 1% of men; ΔE 11.9 from the original
Deuteranopia#004199no green cones; the most common form, about 1% of men; ΔE 4.6 from the original
Tritanopia#005666no blue cones; rare, and affects men and women equally; ΔE 54.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.32:1WCAG large text: AAA
Contrast with black, large text2.25:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 11.4Midnight blue · ΔE 16.7Slate blue · ΔE 20.1Rebecca purple · ΔE 20.3Royal blue · ΔE 21.6Medium purple · ΔE 28.3
Nearest named CSS colourDark slateblue (#483D8B)ΔE 11.42, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#9B7E22
Analogous#227B9B, #42229B
Triadic#9B223F, #3F9B22
Split complementary#9B4222, #7B9B22
Tetradic#9B227B, #9B7E22, #229B42

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9FB1EA
Lighter +30%#758FE1
Lighter +20%#4B6DD8
Lighter +10%#2B50C5
Darker −10%#192E71
Darker −20%#101D47
Darker −30%#060C1E
Darker −40%#000000
More saturated +25%#0A33B3
Less saturated −25%#3A4B83

Channel breakdown

R34
G63
B155
Red34 (13.3%)
Green63 (24.7%)
Blue155 (60.8%)
Hue225.62°
Saturation (HSL)64.02%
Lightness37.06%
Dominant channelBlue
Hex per channelR 22 · G 3F · B 9B

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Every value on this page was computed from “223f9b” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.