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Recognised as Colour

#51D5FD

  • #51D5FD
  • Cyan
  • Light
  • Nearest: Sky blue

#51D5FD is a cyan with RGB values 81, 213, 253 and HSL 194°, 98%, 65%. It is a light colour, so black text on it reaches 12.3:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#51D5FD#51D5FD
HEX#51D5FD
RGBrgb(81, 213, 253)
RGB (0–1)0.3176, 0.8353, 0.9922
RGB percentages31.8%, 83.5%, 99.2%
HSLhsl(194, 97.7%, 65.5%)
HSV / HSBhsv(194, 68%, 99.2%)
CMYK68%, 15.8%, 0%, 0.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,363,197
CSS custom property--colour: #51D5FD;

Brightness & contrast

Relative luminance0.5643WCAG 2.x, 0 is black and 1 is white
Perceived brightness189.4 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.29:1
Contrast with white1.71:1WCAG normal text: Fail
Contrast with black12.29:1WCAG normal text: AAA
Greyscale equivalent#BCBCBC
Inverted#AE2A02

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#BDD0FFno red cones; affects about 1% of men; ΔE 28.1 from the original
Deuteranopia#A6BEFDno green cones; the most common form, about 1% of men; ΔE 30.5 from the original
Tritanopia#00E2E2no blue cones; rare, and affects men and women equally; ΔE 26.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.71:1WCAG large text: Fail
Contrast with black, large text12.29:1WCAG large text: AAA

Named colours

Sky blue · ΔE 12.5Light skyblue · ΔE 13Deep skyblue · ΔE 15.7Light blue · ΔE 22.9Dark turquoise · ΔE 23.7Powder blue · ΔE 24.9
Nearest named CSS colourSky blue (#87CEEB)ΔE 12.52, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FD7951
Analogous#51FDCF, #517FFD
Triadic#FD51D5, #D5FD51
Split complementary#FD517F, #FDCF51
Tetradic#CF51FD, #FD7951, #7FFD51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E8FAFF
Lighter +20%#B6EDFE
Lighter +10%#83E1FE
Darker −10%#1FC9FC
Darker −20%#03B1E5
Darker −30%#028AB3
Darker −40%#016381
More saturated +25%#4FD6FF
Less saturated −25%#67C9E7

Channel breakdown

R81
G213
B253
Red81 (31.8%)
Green213 (83.5%)
Blue253 (99.2%)
Hue193.95°
Saturation (HSL)97.73%
Lightness65.49%
Dominant channelBlue
Hex per channelR 51 · G D5 · B FD

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Every value on this page was computed from “51d5fd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.