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Recognised as Colour

#3740CF

  • #3740CF
  • Blue
  • Dark
  • Nearest: Medium slateblue

#3740CF is a blue with RGB values 55, 64, 207 and HSL 236°, 61%, 51%. It is a dark colour, so white text on it reaches 7.5:1 contrast (AAA for normal text). The nearest named colour is Medium slateblue.

Colour values

#3740CF#3740CF
HEX#3740CF
RGBrgb(55, 64, 207)
RGB (0–1)0.2157, 0.251, 0.8118
RGB percentages21.6%, 25.1%, 81.2%
HSLhsl(236.4, 61.3%, 51.4%)
HSV / HSBhsv(236.4, 73.4%, 81.2%)
CMYK73.4%, 69.1%, 0%, 18.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,621,071
CSS custom property--colour: #3740CF;

Brightness & contrast

Relative luminance0.08984WCAG 2.x, 0 is black and 1 is white
Perceived brightness90.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.51:1
Contrast with white7.51:1WCAG normal text: AAA
Contrast with black2.8:1WCAG normal text: Fail
Greyscale equivalent#484848
Inverted#C8BF30

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#005CD3no red cones; affects about 1% of men; ΔE 21.7 from the original
Deuteranopia#004DCCno green cones; the most common form, about 1% of men; ΔE 13.2 from the original
Tritanopia#006783no blue cones; rare, and affects men and women equally; ΔE 78.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.51:1WCAG large text: AAA
Contrast with black, large text2.8:1WCAG large text: Fail

Named colours

Medium slateblue · ΔE 18.8Slate blue · ΔE 20.8Dark blue · ΔE 22.8Royal blue · ΔE 23.4Navy · ΔE 25.1Blue violet · ΔE 26.3
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 18.8, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CFC637
Analogous#378CCF, #7A37CF
Triadic#CF3740, #40CF37
Split complementary#CF7A37, #8CCF37
Tetradic#CF378C, #CFC637, #37CF7A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DCDDF6
Lighter +30%#B2B6ED
Lighter +20%#898FE3
Lighter +10%#6067D9
Darker −10%#2930AA
Darker −20%#1F2581
Darker −30%#151958
Darker −40%#0B0D2F
More saturated +25%#1825EE
Less saturated −25%#565BB0

Channel breakdown

R55
G64
B207
Red55 (21.6%)
Green64 (25.1%)
Blue207 (81.2%)
Hue236.45°
Saturation (HSL)61.29%
Lightness51.37%
Dominant channelBlue
Hex per channelR 37 · G 40 · B CF

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Every value on this page was computed from “3740cf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.