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Recognised as Colour

#373F80

  • #373F80
  • Blue
  • Dark
  • Nearest: Dark slateblue

#373F80 is a blue with RGB values 55, 63, 128 and HSL 233°, 40%, 36%. It is a dark colour, so white text on it reaches 9.6:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#373F80#373F80
HEX#373F80
RGBrgb(55, 63, 128)
RGB (0–1)0.2157, 0.2471, 0.502
RGB percentages21.6%, 24.7%, 50.2%
HSLhsl(233.4, 39.9%, 35.9%)
HSV / HSBhsv(233.4, 57%, 50.2%)
CMYK57%, 50.8%, 0%, 49.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,620,736
CSS custom property--colour: #373F80;

Brightness & contrast

Relative luminance0.05926WCAG 2.x, 0 is black and 1 is white
Perceived brightness71.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.61:1
Contrast with white9.61:1WCAG normal text: AAA
Contrast with black2.19:1WCAG normal text: Fail
Greyscale equivalent#424242
Inverted#C8C07F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1F4882no red cones; affects about 1% of men; ΔE 10 from the original
Deuteranopia#15427Fno green cones; the most common form, about 1% of men; ΔE 8.3 from the original
Tritanopia#114D59no blue cones; rare, and affects men and women equally; ΔE 40.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text9.61:1WCAG large text: AAA
Contrast with black, large text2.19:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 10Midnight blue · ΔE 23Rebecca purple · ΔE 27.6Slate blue · ΔE 31.8Steel blue · ΔE 32Royal blue · ΔE 34.3
Nearest named CSS colourDark slateblue (#483D8B)ΔE 10, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#807837
Analogous#376480, #533780
Triadic#80373F, #3F8037
Split complementary#805337, #648037
Tetradic#803764, #807837, #378053

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#A9AEDA
Lighter +30%#858DCB
Lighter +20%#626BBB
Lighter +10%#4651A4
Darker −10%#282D5C
Darker −20%#181C39
Darker −30%#090A15
Darker −40%#000000
More saturated +25%#202D97
Less saturated −25%#4E5169

Channel breakdown

R55
G63
B128
Red55 (21.6%)
Green63 (24.7%)
Blue128 (50.2%)
Hue233.42°
Saturation (HSL)39.89%
Lightness35.88%
Dominant channelBlue
Hex per channelR 37 · G 3F · B 80

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Every value on this page was computed from “373f80” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.