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Recognised as Colour

#373DD4

  • #373DD4
  • Blue
  • Dark
  • Nearest: Medium slateblue

#373DD4 is a blue with RGB values 55, 61, 212 and HSL 238°, 65%, 52%. It is a dark colour, so white text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Medium slateblue.

Colour values

#373DD4#373DD4
HEX#373DD4
RGBrgb(55, 61, 212)
RGB (0–1)0.2157, 0.2392, 0.8314
RGB percentages21.6%, 23.9%, 83.1%
HSLhsl(237.7, 64.6%, 52.4%)
HSV / HSBhsv(237.7, 74.1%, 83.1%)
CMYK74.1%, 71.2%, 0%, 16.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,620,308
CSS custom property--colour: #373DD4;

Brightness & contrast

Relative luminance0.08903WCAG 2.x, 0 is black and 1 is white
Perceived brightness90.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.55:1
Contrast with white7.55:1WCAG normal text: AAA
Contrast with black2.78:1WCAG normal text: Fail
Greyscale equivalent#474747
Inverted#C8C22B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005CD8no red cones; affects about 1% of men; ΔE 23.5 from the original
Deuteranopia#004DD1no green cones; the most common form, about 1% of men; ΔE 14.9 from the original
Tritanopia#006884no blue cones; rare, and affects men and women equally; ΔE 83.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.55:1WCAG large text: AAA
Contrast with black, large text2.78:1WCAG large text: Fail

Named colours

Medium slateblue · ΔE 21.4Dark blue · ΔE 23Blue violet · ΔE 23.2Slate blue · ΔE 24.8Dark orchid · ΔE 25.8Navy · ΔE 26.2
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 21.42, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D4CE37
Analogous#378CD4, #7F37D4
Triadic#D4373D, #3DD437
Split complementary#D47F37, #8CD437
Tetradic#D4378C, #D4CE37, #37D47F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DFE0F8
Lighter +30%#B5B7EF
Lighter +20%#8B8EE6
Lighter +10%#6166DD
Darker −10%#262CB2
Darker −20%#1D2188
Darker −30%#14175E
Darker −40%#0B0D34
More saturated +25%#1921F2
Less saturated −25%#5559B6

Channel breakdown

R55
G61
B212
Red55 (21.6%)
Green61 (23.9%)
Blue212 (83.1%)
Hue237.71°
Saturation (HSL)64.61%
Lightness52.35%
Dominant channelBlue
Hex per channelR 37 · G 3D · B D4

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Every value on this page was computed from “373dd4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.