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Colour

#556BB0

  • #556BB0
  • Blue
  • Dark
  • Nearest: Steel blue

#556BB0 is a blue with RGB values 85, 107, 176 and HSL 225°, 37%, 51%. It is a dark colour, so white text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#556BB0#556BB0
HEX#556BB0
RGBrgb(85, 107, 176)
RGB (0–1)0.3333, 0.4196, 0.6902
RGB percentages33.3%, 42%, 69%
HSLhsl(225.5, 36.5%, 51.2%)
HSV / HSBhsv(225.5, 51.7%, 69%)
CMYK51.7%, 39.2%, 0%, 31%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,598,128
CSS custom property--colour: #556BB0;

Brightness & contrast

Relative luminance0.15581WCAG 2.x, 0 is black and 1 is white
Perceived brightness111.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.1:1
Contrast with white5.1:1WCAG normal text: AA
Contrast with black4.12:1WCAG normal text: Fail
Greyscale equivalent#6B6B6B
Inverted#AA944F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5072B3no red cones; affects about 1% of men; ΔE 5 from the original
Deuteranopia#466AAEno green cones; the most common form, about 1% of men; ΔE 3.7 from the original
Tritanopia#2C7A85no blue cones; rare, and affects men and women equally; ΔE 41.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.1:1WCAG large text: AAA
Contrast with black, large text4.12:1WCAG large text: AA

Named colours

Steel blue · ΔE 18.4Cornflower blue · ΔE 18.6Dark slateblue · ΔE 21.3Dodgerblue · ΔE 27.4Medium purple · ΔE 28.6Royal blue · ΔE 29.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 18.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B09A55
Analogous#5599B0, #6C55B0
Triadic#B0556B, #6BB055
Split complementary#B06C55, #99B055
Tetradic#B05599, #B09A55, #55B06C

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E0E4F1
Lighter +30%#BDC6E1
Lighter +20%#9BA8D0
Lighter +10%#7889C0
Darker −10%#43558F
Darker −20%#32406D
Darker −30%#222C4A
Darker −40%#121727
More saturated +25%#365BCF
Less saturated −25%#747B91

Channel breakdown

R85
G107
B176
Red85 (33.3%)
Green107 (42%)
Blue176 (69%)
Hue225.49°
Saturation (HSL)36.55%
Lightness51.18%
Dominant channelBlue
Hex per channelR 55 · G 6B · B B0

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Every value on this page was computed from “556bb0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.