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Recognised as Colour

#3737A7

  • #3737A7
  • Blue
  • Dark
  • Nearest: Rebecca purple

#3737A7 is a blue with RGB values 55, 55, 167 and HSL 240°, 50%, 44%. It is a dark colour, so white text on it reaches 9.3:1 contrast (AAA for normal text). The nearest named colour is Rebecca purple.

Colour values

#3737A7#3737A7
HEX#3737A7
RGBrgb(55, 55, 167)
RGB (0–1)0.2157, 0.2157, 0.6549
RGB percentages21.6%, 21.6%, 65.5%
HSLhsl(240, 50.5%, 43.5%)
HSV / HSBhsv(240, 67.1%, 65.5%)
CMYK67.1%, 67.1%, 0%, 34.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,618,727
CSS custom property--colour: #3737A7;

Brightness & contrast

Relative luminance0.06335WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 9.26:1
Contrast with white9.26:1WCAG normal text: AAA
Contrast with black2.27:1WCAG normal text: Fail
Greyscale equivalent#3F3F3F
Inverted#C8C858

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#004CAAno red cones; affects about 1% of men; ΔE 18.4 from the original
Deuteranopia#0042A5no green cones; the most common form, about 1% of men; ΔE 12.8 from the original
Tritanopia#00546Ano blue cones; rare, and affects men and women equally; ΔE 64.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text9.26:1WCAG large text: AAA
Contrast with black, large text2.27:1WCAG large text: Fail

Named colours

Rebecca purple · ΔE 14.9Slate blue · ΔE 15.3Midnight blue · ΔE 18.4Indigo · ΔE 19.7Dark slateblue · ΔE 20.7Royal blue · ΔE 20.8
Nearest named CSS colourRebecca purple (#663399)ΔE 14.93, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A7A737
Analogous#376FA7, #6F37A7
Triadic#A73737, #37A737
Split complementary#A76F37, #6FA737
Tetradic#A7376F, #A7A737, #37A76F

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C0C0EA
Lighter +30%#9999DE
Lighter +20%#7373D1
Lighter +10%#4D4DC4
Darker −10%#2A2A81
Darker −20%#1E1E5A
Darker −30%#111134
Darker −40%#04040E
More saturated +25%#1B1BC3
Less saturated −25%#53538B

Channel breakdown

R55
G55
B167
Red55 (21.6%)
Green55 (21.6%)
Blue167 (65.5%)
Hue240°
Saturation (HSL)50.45%
Lightness43.53%
Dominant channelBlue
Hex per channelR 37 · G 37 · B A7

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Every value on this page was computed from “3737a7” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.