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Recognised as Colour

#81B8DA

  • #81B8DA
  • Blue
  • Dark
  • Nearest: Sky blue

#81B8DA is a blue with RGB values 129, 184, 218 and HSL 203°, 55%, 68%. It is a dark colour, so black text on it reaches 9.8:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#81B8DA#81B8DA
HEX#81B8DA
RGBrgb(129, 184, 218)
RGB (0–1)0.5059, 0.7216, 0.8549
RGB percentages50.6%, 72.2%, 85.5%
HSLhsl(202.9, 54.6%, 68%)
HSV / HSBhsv(202.9, 40.8%, 85.5%)
CMYK40.8%, 15.6%, 0%, 14.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,501,466
CSS custom property--colour: #81B8DA;

Brightness & contrast

Relative luminance0.4401WCAG 2.x, 0 is black and 1 is white
Perceived brightness174 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.8:1
Contrast with white2.14:1WCAG normal text: Fail
Contrast with black9.8:1WCAG normal text: AAA
Greyscale equivalent#AFAFAF
Inverted#7E4725

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A9B7DCno red cones; affects about 1% of men; ΔE 12.9 from the original
Deuteranopia#9CADD9no green cones; the most common form, about 1% of men; ΔE 13.4 from the original
Tritanopia#5FC1C3no blue cones; rare, and affects men and women equally; ΔE 22.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.14:1WCAG large text: Fail
Contrast with black, large text9.8:1WCAG large text: AAA

Named colours

Sky blue · ΔE 9Light skyblue · ΔE 9.6Light steelblue · ΔE 12.6Light blue · ΔE 16.2Powder blue · ΔE 20.8Light slate grey · ΔE 21.2
Nearest named CSS colourSky blue (#87CEEB)ΔE 9.04, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DAA381
Analogous#81DAD0, #818BDA
Triadic#DA81B8, #B8DA81
Split complementary#DA818B, #DAD081
Tetradic#D081DA, #DAA381, #8BDA81

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#F7FBFD
Lighter +20%#D0E4F1
Lighter +10%#A8CEE6
Darker −10%#5AA2CE
Darker −20%#388ABD
Darker −30%#2C6D96
Darker −40%#20516F
More saturated +25%#6DBDEE
Less saturated −25%#95B3C6

Channel breakdown

R129
G184
B218
Red129 (50.6%)
Green184 (72.2%)
Blue218 (85.5%)
Hue202.92°
Saturation (HSL)54.6%
Lightness68.04%
Dominant channelBlue
Hex per channelR 81 · G B8 · B DA

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Every value on this page was computed from “81b8da” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.