#51B7EB#51B7EB

#51B7EB is a light, vivid cyan. Relative luminance 0.416; OKLCH L 74.1% C 0.120 H 234.0°. Best body text is #000000 at 9.32:1 contrast (WCAG AA passes).

Color values

HEX	#51B7EB
RGB	rgb(81, 183, 235)
HSL	hsl(200, 79%, 62%)
HSV	hsv(200, 66%, 92%)
CMYK	cmyk(65.5%, 22.1%, 0%, 7.8%)
CIE-LAB	lab(70.60, -13.82, -34.66)
CIE-LCH	lch(70.60, 37.32, 248.26°)
OKLab	oklab(74.05% -0.0708 -0.0972)
OKLCH	oklch(74.05% 0.12 234)
XYZ	xyz(35.3164, 41.6107, 84.7516)
Luminance	0.4161 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B7EB #EB8551

analogous

#51EBD2 #51B7EB #516AEB

triadic

#51B7EB #EB51B7 #B7EB51

tetradic

#51B7EB #D251EB #EB8551 #6AEB51

square

#51B7EB #D251EB #EB8551 #6AEB51

split-complementary

#51B7EB #EB516A #EBD251

monochromatic

#147AAE #1AA0E5 #51B7EB #88CEF1 #BFE4F8

Accessibility & contrast

On white

2.25

#51B7EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.32

#51B7EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7EB

9.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B7EB	#FFFFFF	#000000	##000000
##51B7EB	1.00	2.25	9.32	9.32
#FFFFFF	2.25	1.00	21.00	21.00
#000000	9.32	21.00	1.00	1.00
##000000	9.32	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB5ED

Deuteranopia (green-blind)

#89A6EA

Tritanopia (blue-blind)

#00C5C8

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #51b7eb;
/* rgb */ color: rgb(81, 183, 235);
/* oklch */ color: oklch(74.1% 0.120 234.0);

Tailwind

colors: {
  custom: {
    50: '#91ccf1',
    500: '#51b7eb',
    950: '#000000',
  },
}

SCSS

$custom: #51b7eb;
$custom-light: #91ccf1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b7eb",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 235
  },
  "hsl": {
    "h": 200.26,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.74051,
    "c": 0.12027,
    "h": 234
  },
  "luminance": 0.41614
}

Semantic roles & 50–950 ramp

primary

#51B7EB

secondary

#E8C3B0

accent

#510ADC

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B7EB

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

Preview Lab → · Contrast checker → · Palette generator →