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Recognised as Colour

#040B37

  • #040B37
  • Blue
  • Dark
  • Nearest: Midnight blue

#040B37 is a blue with RGB values 4, 11, 55 and HSL 232°, 86%, 12%. It is a dark colour, so white text on it reaches 18.9:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Colour values

#040B37#040B37
HEX#040B37
RGBrgb(4, 11, 55)
RGB (0–1)0.0157, 0.0431, 0.2157
RGB percentages1.6%, 4.3%, 21.6%
HSLhsl(231.8, 86.4%, 11.6%)
HSV / HSBhsv(231.8, 92.7%, 21.6%)
CMYK92.7%, 80%, 0%, 78.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer265,015
CSS custom property--colour: #040B37;

Brightness & contrast

Relative luminance0.00541WCAG 2.x, 0 is black and 1 is white
Perceived brightness20.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.95:1
Contrast with white18.95:1WCAG normal text: AAA
Contrast with black1.11:1WCAG normal text: Fail
Greyscale equivalent#0D0D0D
Inverted#FBF4C8

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#001338no red cones; affects about 1% of men; ΔE 5.6 from the original
Deuteranopia#000E36no green cones; the most common form, about 1% of men; ΔE 3.3 from the original
Tritanopia#00171Fno blue cones; rare, and affects men and women equally; ΔE 28 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.95:1WCAG large text: AAA
Contrast with black, large text1.11:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 29.5Dark slateblue · ΔE 31.6Black · ΔE 32.3Rebecca purple · ΔE 44.2Dark slate grey · ΔE 44.5Indigo · ΔE 47.6
Nearest named CSS colourMidnight blue (#191970)ΔE 29.48, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#373004
Analogous#042537, #160437
Triadic#37040B, #0B3704
Split complementary#371604, #253704
Tetradic#370425, #373004, #043716

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#1936EE
Lighter +30%#0E28C6
Lighter +20%#0B1E96
Lighter +10%#071567
Darker −10%#010107
Darker −20%#000000
Darker −30%#000000
Darker −40%#000000
More saturated +25%#00083B
Less saturated −25%#0B1030

Channel breakdown

R4
G11
B55
Red4 (1.6%)
Green11 (4.3%)
Blue55 (21.6%)
Hue231.76°
Saturation (HSL)86.44%
Lightness11.57%
Dominant channelBlue
Hex per channelR 04 · G 0B · B 37

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Every value on this page was computed from “040b37” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.