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Recognised as Colour

#51AFD3

  • #51AFD3
  • Cyan
  • Dark
  • Nearest: Sky blue

#51AFD3 is a cyan with RGB values 81, 175, 211 and HSL 197°, 60%, 57%. It is a dark colour, so black text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#51AFD3#51AFD3
HEX#51AFD3
RGBrgb(81, 175, 211)
RGB (0–1)0.3176, 0.6863, 0.8275
RGB percentages31.8%, 68.6%, 82.7%
HSLhsl(196.6, 59.6%, 57.3%)
HSV / HSBhsv(196.6, 61.6%, 82.7%)
CMYK61.6%, 17.1%, 0%, 17.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,353,427
CSS custom property--colour: #51AFD3;

Brightness & contrast

Relative luminance0.37112WCAG 2.x, 0 is black and 1 is white
Perceived brightness158.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.42:1
Contrast with white2.49:1WCAG normal text: Fail
Contrast with black8.42:1WCAG normal text: AAA
Greyscale equivalent#9E9E9E
Inverted#AE502C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#9CACD5no red cones; affects about 1% of men; ΔE 21.3 from the original
Deuteranopia#899ED3no green cones; the most common form, about 1% of men; ΔE 22.7 from the original
Tritanopia#00BABBno blue cones; rare, and affects men and women equally; ΔE 25.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.49:1WCAG large text: Fail
Contrast with black, large text8.42:1WCAG large text: AAA

Named colours

Sky blue · ΔE 13.2Light skyblue · ΔE 14Deep skyblue · ΔE 16.8Cadetblue · ΔE 20.3Steel blue · ΔE 20.6Light steelblue · ΔE 22.4
Nearest named CSS colourSky blue (#87CEEB)ΔE 13.16, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D37551
Analogous#51D3B6, #516ED3
Triadic#D351AF, #AFD351
Split complementary#D3516E, #D3B651
Tetradic#B651D3, #D37551, #6ED351

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F4FAFC
Lighter +30%#CBE7F2
Lighter +20%#A2D4E8
Lighter +10%#7AC2DD
Darker −10%#3199C0
Darker −20%#267898
Darker −30%#1C586F
Darker −40%#123846
More saturated +25%#36BBEE
Less saturated −25%#6CA3B8

Channel breakdown

R81
G175
B211
Red81 (31.8%)
Green175 (68.6%)
Blue211 (82.7%)
Hue196.62°
Saturation (HSL)59.63%
Lightness57.25%
Dominant channelBlue
Hex per channelR 51 · G AF · B D3

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Every value on this page was computed from “51afd3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.