#51C9EB#51C9EB

#51C9EB is a light, moderate cyan. Relative luminance 0.495; OKLCH L 78.2% C 0.116 H 220.0°. Best body text is #000000 at 10.90:1 contrast (WCAG AA passes).

Color values

HEX	#51C9EB
RGB	rgb(81, 201, 235)
HSL	hsl(193, 79%, 62%)
HSV	hsv(193, 66%, 92%)
CMYK	cmyk(65.5%, 14.5%, 0%, 7.8%)
CIE-LAB	lab(75.77, -23.17, -26.70)
CIE-LCH	lch(75.77, 35.35, 229.05°)
OKLab	oklab(78.18% -0.0888 -0.0744)
OKLCH	oklch(78.18% 0.116 220)
XYZ	xyz(39.2693, 49.5165, 86.0692)
Luminance	0.4952 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C9EB #EB7351

analogous

#51EBC0 #51C9EB #517CEB

triadic

#51C9EB #EB51C9 #C9EB51

tetradic

#51C9EB #C051EB #EB7351 #7CEB51

square

#51C9EB #C051EB #EB7351 #7CEB51

split-complementary

#51C9EB #EB517C #EBC051

monochromatic

#148CAE #1AB8E5 #51C9EB #88DAF1 #BFEBF8

Accessibility & contrast

On white

1.93

#51C9EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.90

#51C9EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C9EB

10.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C9EB	#FFFFFF	#000000	##000000
##51C9EB	1.00	1.93	10.90	10.90
#FFFFFF	1.93	1.00	21.00	21.00
#000000	10.90	21.00	1.00	1.00
##000000	10.90	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B4C4ED

Deuteranopia (green-blind)

#9EB4EB

Tritanopia (blue-blind)

#00D4D4

Achromatopsia (no color)

#BBBBBB

Design tokens & code

CSS

--color: #51c9eb;
/* rgb */ color: rgb(81, 201, 235);
/* oklch */ color: oklch(78.2% 0.116 220.0);

Tailwind

colors: {
  custom: {
    50: '#92d9f1',
    500: '#51c9eb',
    950: '#000000',
  },
}

SCSS

$custom: #51c9eb;
$custom-light: #92d9f1;
$custom-dark: #000000;

JSON

{
  "hex": "#51c9eb",
  "rgb": {
    "r": 81,
    "g": 201,
    "b": 235
  },
  "hsl": {
    "h": 193.247,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.78181,
    "c": 0.11585,
    "h": 220
  },
  "luminance": 0.49521
}

Semantic roles & 50–950 ramp

primary

#51C9EB

secondary

#E8BCB0

accent

#380ADC

background

#F9FDFE

surface

#F2FAFD

border

#CCD3D5

text

#0E1416

muted

#7E8384

Preview Lab

Preview with #51C9EB

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

Preview Lab → · Contrast checker → · Palette generator →