#51A5EE#51A5EE

#51A5EE is a light, vivid cyan. Relative luminance 0.348; OKLCH L 70.1% C 0.135 H 247.4°. Best body text is #000000 at 7.97:1 contrast (WCAG AA passes).

Color values

HEX	#51A5EE
RGB	rgb(81, 165, 238)
HSL	hsl(208, 82%, 63%)
HSV	hsv(208, 66%, 93%)
CMYK	cmyk(66%, 30.7%, 0%, 6.7%)
CIE-LAB	lab(65.62, -2.96, -44.08)
CIE-LCH	lch(65.62, 44.18, 266.16°)
OKLab	oklab(70.15% -0.0519 -0.1246)
OKLCH	oklch(70.15% 0.135 247.4)
XYZ	xyz(32.2753, 34.8293, 85.8941)
Luminance	0.3483 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51A5EE #EE9A51

analogous

#51EEE8 #51A5EE #5157EE

triadic

#51A5EE #EE51A5 #A5EE51

tetradic

#51A5EE #E851EE #EE9A51 #57EE51

square

#51A5EE #E851EE #EE9A51 #57EE51

split-complementary

#51A5EE #EE5157 #EEE851

monochromatic

#1168B3 #1988E9 #51A5EE #89C2F3 #C1DFF9

Accessibility & contrast

On white

2.64

#51A5EE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.97

#51A5EE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A5EE

7.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51A5EE	#FFFFFF	#000000	##000000
##51A5EE	1.00	2.64	7.97	7.97
#FFFFFF	2.64	1.00	21.00	21.00
#000000	7.97	21.00	1.00	1.00
##000000	7.97	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#85A8F1

Deuteranopia (green-blind)

#6F99ED

Tritanopia (blue-blind)

#00B6BF

Achromatopsia (no color)

#9F9F9F

Design tokens & code

CSS

--color: #51a5ee;
/* rgb */ color: rgb(81, 165, 238);
/* oklch */ color: oklch(70.1% 0.135 247.4);

Tailwind

colors: {
  custom: {
    50: '#91bff4',
    500: '#51a5ee',
    950: '#000000',
  },
}

SCSS

$custom: #51a5ee;
$custom-light: #91bff4;
$custom-dark: #000000;

JSON

{
  "hex": "#51a5ee",
  "rgb": {
    "r": 81,
    "g": 165,
    "b": 238
  },
  "hsl": {
    "h": 207.898,
    "s": 82.199,
    "l": 62.549
  },
  "oklch": {
    "l": 0.70146,
    "c": 0.13503,
    "h": 247.4
  },
  "luminance": 0.34833
}

Semantic roles & 50–950 ramp

primary

#51A5EE

secondary

#EACBB1

accent

#6B07DF

background

#F9FBFE

surface

#F2F7FD

border

#CCD0D5

text

#0E1217

muted

#7E8185

Preview Lab

Preview with #51A5EE

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →