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Recognised as Colour

#51AFDD

  • #51AFDD
  • Cyan
  • Dark
  • Nearest: Deep skyblue

#51AFDD is a cyan with RGB values 81, 175, 221 and HSL 200°, 67%, 59%. It is a dark colour, so black text on it reaches 8.5:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#51AFDD#51AFDD
HEX#51AFDD
RGBrgb(81, 175, 221)
RGB (0–1)0.3176, 0.6863, 0.8667
RGB percentages31.8%, 68.6%, 86.7%
HSLhsl(199.7, 67.3%, 59.2%)
HSV / HSBhsv(199.7, 63.3%, 86.7%)
CMYK63.3%, 20.8%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,353,437
CSS custom property--colour: #51AFDD;

Brightness & contrast

Relative luminance0.3763WCAG 2.x, 0 is black and 1 is white
Perceived brightness159.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.53:1
Contrast with white2.46:1WCAG normal text: Fail
Contrast with black8.53:1WCAG normal text: AAA
Greyscale equivalent#9E9E9E
Inverted#AE5022

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#98ADDFno red cones; affects about 1% of men; ΔE 18.9 from the original
Deuteranopia#859FDCno green cones; the most common form, about 1% of men; ΔE 20.4 from the original
Tritanopia#00BBBEno blue cones; rare, and affects men and women equally; ΔE 29.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.46:1WCAG large text: Fail
Contrast with black, large text8.53:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 12.6Light skyblue · ΔE 12.7Sky blue · ΔE 15.3Steel blue · ΔE 18.2Light steelblue · ΔE 23.2Cadetblue · ΔE 25.6
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 12.65, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DD7F51
Analogous#51DDC5, #5169DD
Triadic#DD51AF, #AFDD51
Split complementary#DD5169, #DDC551
Tetradic#C551DD, #DD7F51, #69DD51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FCFDFE
Lighter +30%#D1EAF6
Lighter +20%#A6D6EE
Lighter +10%#7CC3E5
Darker −10%#299AD2
Darker −20%#217BA7
Darker −30%#185C7D
Darker −40%#103C52
More saturated +25%#37B8F7
Less saturated −25%#6BA6C3

Channel breakdown

R81
G175
B221
Red81 (31.8%)
Green175 (68.6%)
Blue221 (86.7%)
Hue199.71°
Saturation (HSL)67.31%
Lightness59.22%
Dominant channelBlue
Hex per channelR 51 · G AF · B DD

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