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Recognised as Colour

#81BBFF

  • #81BBFF
  • Blue
  • Dark
  • Nearest: Light skyblue

#81BBFF is a blue with RGB values 129, 187, 255 and HSL 212°, 100%, 75%. It is a dark colour, so black text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Light skyblue.

Colour values

#81BBFF#81BBFF
HEX#81BBFF
RGBrgb(129, 187, 255)
RGB (0–1)0.5059, 0.7333, 1
RGB percentages50.6%, 73.3%, 100%
HSLhsl(212.4, 100%, 75.3%)
HSV / HSBhsv(212.4, 49.4%, 100%)
CMYK49.4%, 26.7%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,502,271
CSS custom property--colour: #81BBFF;

Brightness & contrast

Relative luminance0.47428WCAG 2.x, 0 is black and 1 is white
Perceived brightness181.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.49:1
Contrast with white2:1WCAG normal text: Fail
Contrast with black10.49:1WCAG normal text: AAA
Greyscale equivalent#B4B4B4
Inverted#7E4400

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A0BEFFno red cones; affects about 1% of men; ΔE 7.6 from the original
Deuteranopia#90B2FEno green cones; the most common form, about 1% of men; ΔE 8.6 from the original
Tritanopia#45CAD3no blue cones; rare, and affects men and women equally; ΔE 40.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2:1WCAG large text: Fail
Contrast with black, large text10.49:1WCAG large text: AAA

Named colours

Light skyblue · ΔE 15.8Deep skyblue · ΔE 17.5Cornflower blue · ΔE 18.8Steel blue · ΔE 23.4Sky blue · ΔE 23.5Light steelblue · ΔE 24.5
Nearest named CSS colourLight skyblue (#87CEFA)ΔE 15.8, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFC581
Analogous#81FAFF, #8681FF
Triadic#FF81BB, #BBFF81
Split complementary#FF8681, #FAFF81
Tetradic#FF81FA, #FFC581, #81FF86

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FFFFFF
Lighter +20%#E7F2FF
Lighter +10%#B4D7FF
Darker −10%#4E9FFF
Darker −20%#1B84FF
Darker −30%#006AE7
Darker −40%#0053B4
More saturated +25%#81BBFF
Less saturated −25%#91BCEF

Channel breakdown

R129
G187
B255
Red129 (50.6%)
Green187 (73.3%)
Blue255 (100%)
Hue212.38°
Saturation (HSL)100%
Lightness75.29%
Dominant channelBlue
Hex per channelR 81 · G BB · B FF

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