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#51D1EF

#51d1ef ≈ Sky Blue

  • cyan
  • Lightness: high
  • Saturation: strong
  • Cool
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#51d1ef is a color from the cyan family, with high lightness and strong saturation. In the RGB model it is made of 31.76% red, 81.96% green and 93.73% blue; printed in CMYK it uses 66.11% cyan, 12.55% magenta, 0% yellow and 6.27% black. Its hue angle is 191.39°, with 83.16% saturation and 62.75% lightness in HSL. It is a cool color, often associated with freshness, technology and clarity. Designers typically use it for health and wellness, technology products and call-to-action buttons. Black text on this color reaches a contrast ratio of 11.72:1 (WCAG AAA). The closest named color is Sky Blue (#87ceeb), ΔE 5.74.

Description generated from the measured properties of this color.

HEX
RGB
RGB percent
CMY
CMYK
HSL
HSV / HSB
Web safe#66ccff
CIE-LAB
XYZ
xyY
CIE-LCH
CIE-LUV
Hunter-Lab
OKLab
Binary
Decimal
Relative luminance0.5358

Complementary

  1. #51d1ef
  2. #ef6f51

Split complementary

  1. #51d1ef
  2. #ef5182
  3. #efbe51

Analogous

  1. #51efbe
  2. #51d1ef
  3. #5182ef

Triadic

  1. #51d1ef
  2. #ef51d1
  3. #d1ef51

Tetradic

  1. #51d1ef
  2. #6f51ef
  3. #ef6f51
  4. #d1ef51

Square

  1. #51d1ef
  2. #be51ef
  3. #ef6f51
  4. #82ef51

Monochromatic

  1. #0e7f99
  2. #15b9df
  3. #51d1ef
  4. #97e4f5
  5. #ddf6fc

Shades

#51d1ef mixed progressively with black.

  1. #51d1ef
  2. #49bcd7
  3. #41a7bf
  4. #3992a7
  5. #317d8f
  6. #296978
  7. #205460
  8. #183f48
  9. #102a30
  10. #081518
  11. #000000

Tints

#51d1ef mixed progressively with white.

  1. #51d1ef
  2. #62d6f1
  3. #74daf2
  4. #85dff4
  5. #97e3f5
  6. #a8e8f7
  7. #b9edf9
  8. #cbf1fa
  9. #dcf6fc
  10. #eefafd
  11. #ffffff

Tones

#51d1ef mixed progressively with gray.

  1. #51d1ef
  2. #56c9e4
  3. #5ac1d9
  4. #5fb9ce
  5. #64b1c3
  6. #69a9b8
  7. #6da0ac
  8. #7298a1
  9. #779096
  10. #7b888b
  11. #808080

Readable text 1.79:1 AA ✕ AA Large ✕ AAA ✕ AAA Large ✕
Readable text 11.72:1 AA ✓ AA Large ✓ AAA ✓ AAA Large ✓

Achromatopsia #c1c1c1 ≈ 0.003% of males
Achromatomaly #a1c8d5 ≈ 0.001% of males
Protanopia #bdcbf1 ≈ 1.01% of males
Deuteranopia #a6baef ≈ 1.27% of males
Tritanopia #00dcda ≈ 0.0001% of males
Protanomaly #9dcdf0 ≈ 1.08% of males
Deuteranomaly #8cc4ef ≈ 4.63% of males
Tritanomaly #00d8e3 ≈ 0.0002% of males
Simulate on your own image

Text in this color

Background in this color

Border in this color

Text color
.text-51d1ef {
  color: #51d1ef;
}
Background
.bg-51d1ef {
  background-color: #51d1ef;
  color: #000000;
}
Border
.border-51d1ef {
  border: 2px solid #51d1ef;
}
CSS variables
:root {
  --color-primary: #51d1ef;
  --color-primary-rgb: 81 209 239;
  --color-primary-hsl: 191 83% 63%;
}
Gradient
.gradient-51d1ef {
  background: linear-gradient(135deg, #51d1ef, #5182ef);
}
Colored shadow
.shadow-51d1ef {
  box-shadow: 0 8px 24px rgb(81 209 239 / 0.35);
}

#87ceeb Sky Blue ΔE 5.74 #89cff0 Baby Blue ΔE 6.60 #a4dded Non-Photo Blue ΔE 8.60 #87cefa Light Sky Blue ΔE 8.84 #00bfff Deep Sky Blue ΔE 9.76 #00ced1 Dark Turquoise ΔE 10.41 #add8e6 Light Blue ΔE 10.44 #ae2e10 Inverted #c1c1c1 Grayscale 

Sky Blue
#51d1ef  rgb(81, 209, 239)  hsl(191, 83%, 63%)  Sky Blue
#ef6f51  rgb(239, 111, 81)  hsl(11, 83%, 63%)  Burnt Sienna
#ef51d1  rgb(239, 81, 209)  hsl(311, 83%, 63%)  Shocking Pink
#d1ef51  rgb(209, 239, 81)  hsl(71, 83%, 63%)  Pear