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Recognised as Colour

#51AAD0

  • #51AAD0
  • Cyan
  • Dark
  • Nearest: Light skyblue

#51AAD0 is a cyan with RGB values 81, 170, 208 and HSL 198°, 57%, 57%. It is a dark colour, so black text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Light skyblue.

Colour values

#51AAD0#51AAD0
HEX#51AAD0
RGBrgb(81, 170, 208)
RGB (0–1)0.3176, 0.6667, 0.8157
RGB percentages31.8%, 66.7%, 81.6%
HSLhsl(198, 57.5%, 56.7%)
HSV / HSBhsv(198, 61.1%, 81.6%)
CMYK61.1%, 18.3%, 0%, 18.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,352,144
CSS custom property--colour: #51AAD0;

Brightness & contrast

Relative luminance0.35053WCAG 2.x, 0 is black and 1 is white
Perceived brightness154.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.01:1
Contrast with white2.62:1WCAG normal text: Fail
Contrast with black8.01:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#AE552F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#96A7D2no red cones; affects about 1% of men; ΔE 19.7 from the original
Deuteranopia#849AD0no green cones; the most common form, about 1% of men; ΔE 21.1 from the original
Tritanopia#00B5B6no blue cones; rare, and affects men and women equally; ΔE 26.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.62:1WCAG large text: Fail
Contrast with black, large text8.01:1WCAG large text: AAA

Named colours

Light skyblue · ΔE 14.7Sky blue · ΔE 14.7Deep skyblue · ΔE 16.8Steel blue · ΔE 18.1Cadetblue · ΔE 20.9Light steelblue · ΔE 22.5
Nearest named CSS colourLight skyblue (#87CEFA)ΔE 14.7, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D07751
Analogous#51D0B7, #516AD0
Triadic#D051AA, #AAD051
Split complementary#D0516A, #D0B751
Tetradic#B751D0, #D07751, #6AD051

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F2F8FB
Lighter +30%#C9E5F1
Lighter +20%#A1D1E6
Lighter +10%#79BEDB
Darker −10%#3392BB
Darker −20%#287393
Darker −30%#1D546B
Darker −40%#123443
More saturated +25%#35B5EC
Less saturated −25%#6D9FB4

Channel breakdown

R81
G170
B208
Red81 (31.8%)
Green170 (66.7%)
Blue208 (81.6%)
Hue197.95°
Saturation (HSL)57.47%
Lightness56.67%
Dominant channelBlue
Hex per channelR 51 · G AA · B D0

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Every value on this page was computed from “51aad0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.