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Colour

#0055AA

  • #0055AA
  • Blue
  • Dark
  • Nearest: Dark slateblue

#0055AA is a blue with RGB values 0, 85, 170 and HSL 210°, 100%, 33%. It is a dark colour, so white text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#0055AA#0055AA
HEX#0055AA
HEX (short)#05A
RGBrgb(0, 85, 170)
RGB (0–1)0, 0.3333, 0.6667
RGB percentages0%, 33.3%, 66.7%
HSLhsl(210, 100%, 33.3%)
HSV / HSBhsv(210, 100%, 66.7%)
CMYK100%, 50%, 0%, 33.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer21,930
CSS custom property--colour: #0055AA;

Brightness & contrast

Relative luminance0.09399WCAG 2.x, 0 is black and 1 is white
Perceived brightness86.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.29:1
Contrast with white7.29:1WCAG normal text: AAA
Contrast with black2.88:1WCAG normal text: Fail
Greyscale equivalent#494949
Inverted#FFAA55

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#1E5EADno red cones; affects about 1% of men; ΔE 5.7 from the original
Deuteranopia#0050A8no green cones; the most common form, about 1% of men; ΔE 3.3 from the original
Tritanopia#006A77no blue cones; rare, and affects men and women equally; ΔE 49.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.29:1WCAG large text: AAA
Contrast with black, large text2.88:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 17.4Royal blue · ΔE 22.4Cornflower blue · ΔE 25.5Dodgerblue · ΔE 25.7Slate blue · ΔE 25.8Midnight blue · ΔE 28.4
Nearest named CSS colourDark slateblue (#483D8B)ΔE 17.42, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AA5500
Analogous#00AAAA, #0000AA
Triadic#AA0055, #55AA00
Split complementary#AA0000, #AAAA00
Tetradic#AA00AA, #AA5500, #00AA00

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#77BBFF
Lighter +30%#44A2FF
Lighter +20%#1188FF
Lighter +10%#006EDD
Darker −10%#003B77
Darker −20%#002244
Darker −30%#000811
Darker −40%#000000
More saturated +25%#0055AA
Less saturated −25%#155595

Channel breakdown

R0
G85
B170
Red0 (0%)
Green85 (33.3%)
Blue170 (66.7%)
Hue210°
Saturation (HSL)100%
Lightness33.33%
Dominant channelBlue
Hex per channelR 00 · G 55 · B AA

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Every value on this page was computed from “0055aa” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.