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Recognised as Colour

#81B5D2

  • #81B5D2
  • Blue
  • Dark
  • Nearest: Sky blue

#81B5D2 is a blue with RGB values 129, 181, 210 and HSL 201°, 47%, 66%. It is a dark colour, so black text on it reaches 9.5:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#81B5D2#81B5D2
HEX#81B5D2
RGBrgb(129, 181, 210)
RGB (0–1)0.5059, 0.7098, 0.8235
RGB percentages50.6%, 71%, 82.4%
HSLhsl(201.5, 47.4%, 66.5%)
HSV / HSBhsv(201.5, 38.6%, 82.4%)
CMYK38.6%, 13.8%, 0%, 17.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,500,690
CSS custom property--colour: #81B5D2;

Brightness & contrast

Relative luminance0.42368WCAG 2.x, 0 is black and 1 is white
Perceived brightness171 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.47:1
Contrast with white2.22:1WCAG normal text: Fail
Contrast with black9.47:1WCAG normal text: AAA
Greyscale equivalent#ACACAC
Inverted#7E4A2D

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A7B3D4no red cones; affects about 1% of men; ΔE 12.9 from the original
Deuteranopia#9CAAD2no green cones; the most common form, about 1% of men; ΔE 13.9 from the original
Tritanopia#63BDBEno blue cones; rare, and affects men and women equally; ΔE 20.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.22:1WCAG large text: Fail
Contrast with black, large text9.47:1WCAG large text: AAA

Named colours

Sky blue · ΔE 9.6Light skyblue · ΔE 12.1Light steelblue · ΔE 12.2Light blue · ΔE 15.4Cadetblue · ΔE 18.9Light slate grey · ΔE 19.2
Nearest named CSS colourSky blue (#87CEEB)ΔE 9.62, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D29E81
Analogous#81D2C7, #818CD2
Triadic#D281B5, #B5D281
Split complementary#D2818C, #D2C681
Tetradic#C781D2, #D29E81, #8DD281

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#F2F7FA
Lighter +20%#CCE1ED
Lighter +10%#A7CBDF
Darker −10%#5B9FC5
Darker −20%#3E86AF
Darker −30%#316A89
Darker −40%#244D63
More saturated +25%#6CBBE7
Less saturated −25%#96AFBD

Channel breakdown

R129
G181
B210
Red129 (50.6%)
Green181 (71%)
Blue210 (82.4%)
Hue201.48°
Saturation (HSL)47.37%
Lightness66.47%
Dominant channelBlue
Hex per channelR 81 · G B5 · B D2

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Every value on this page was computed from “81b5d2” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.