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Colour

#3737B5

  • #3737B5
  • Blue
  • Dark
  • Nearest: Slate blue

#3737B5 is a blue with RGB values 55, 55, 181 and HSL 240°, 53%, 46%. It is a dark colour, so white text on it reaches 8.8:1 contrast (AAA for normal text). The nearest named colour is Slate blue.

Colour values

#3737B5#3737B5
HEX#3737B5
RGBrgb(55, 55, 181)
RGB (0–1)0.2157, 0.2157, 0.7098
RGB percentages21.6%, 21.6%, 71%
HSLhsl(240, 53.4%, 46.3%)
HSV / HSBhsv(240, 69.6%, 71%)
CMYK69.6%, 69.6%, 0%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,618,741
CSS custom property--colour: #3737B5;

Brightness & contrast

Relative luminance0.06881WCAG 2.x, 0 is black and 1 is white
Perceived brightness80.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 8.84:1
Contrast with white8.84:1WCAG normal text: AAA
Contrast with black2.38:1WCAG normal text: Fail
Greyscale equivalent#404040
Inverted#C8C84A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0050B9no red cones; affects about 1% of men; ΔE 20.1 from the original
Deuteranopia#0044B3no green cones; the most common form, about 1% of men; ΔE 13.4 from the original
Tritanopia#005972no blue cones; rare, and affects men and women equally; ΔE 70.7 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text8.84:1WCAG large text: AAA
Contrast with black, large text2.38:1WCAG large text: Fail

Named colours

Slate blue · ΔE 17Rebecca purple · ΔE 19.4Dark blue · ΔE 19.5Navy · ΔE 19.8Indigo · ΔE 20.3Medium slateblue · ΔE 20.7
Nearest named CSS colourSlate blue (#6A5ACD)ΔE 16.97, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B5B537
Analogous#3776B5, #7637B5
Triadic#B53737, #37B537
Split complementary#B57637, #76B537
Tetradic#B53776, #B5B537, #37B576

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C9C9EF
Lighter +30%#A2A2E3
Lighter +20%#7B7BD7
Lighter +10%#5454CB
Darker −10%#2B2B8E
Darker −20%#1F1F67
Darker −30%#131340
Darker −40%#070719
More saturated +25%#1919D3
Less saturated −25%#545498

Channel breakdown

R55
G55
B181
Red55 (21.6%)
Green55 (21.6%)
Blue181 (71%)
Hue240°
Saturation (HSL)53.39%
Lightness46.27%
Dominant channelBlue
Hex per channelR 37 · G 37 · B B5

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Every value on this page was computed from “3737b5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.