#51B9EB#51B9EB

#51B9EB is a light, moderate cyan. Relative luminance 0.424; OKLCH L 74.5% C 0.119 H 232.5°. Best body text is #000000 at 9.49:1 contrast (WCAG AA passes).

Color values

HEX	#51B9EB
RGB	rgb(81, 185, 235)
HSL	hsl(199, 79%, 62%)
HSV	hsv(199, 66%, 92%)
CMYK	cmyk(65.5%, 21.3%, 0%, 7.8%)
CIE-LAB	lab(71.17, -14.89, -33.77)
CIE-LCH	lch(71.17, 36.91, 246.21°)
OKLab	oklab(74.51% -0.0728 -0.0947)
OKLCH	oklch(74.51% 0.119 232.5)
XYZ	xyz(35.7318, 42.4416, 84.8901)
Luminance	0.4244 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B9EB #EB8351

analogous

#51EBD0 #51B9EB #516CEB

triadic

#51B9EB #EB51B9 #B9EB51

tetradic

#51B9EB #D051EB #EB8351 #6CEB51

square

#51B9EB #D051EB #EB8351 #6CEB51

split-complementary

#51B9EB #EB516C #EBD051

monochromatic

#147CAE #1AA3E5 #51B9EB #88CFF1 #BFE5F8

Accessibility & contrast

On white

2.21

#51B9EB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.49

#51B9EB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9EB

9.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B9EB	#FFFFFF	#000000	##000000
##51B9EB	1.00	2.21	9.49	9.49
#FFFFFF	2.21	1.00	21.00	21.00
#000000	9.49	21.00	1.00	1.00
##000000	9.49	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B7ED

Deuteranopia (green-blind)

#8BA7EA

Tritanopia (blue-blind)

#00C6CA

Achromatopsia (no color)

#AEAEAE

Design tokens & code

CSS

--color: #51b9eb;
/* rgb */ color: rgb(81, 185, 235);
/* oklch */ color: oklch(74.5% 0.119 232.5);

Tailwind

colors: {
  custom: {
    50: '#91cef1',
    500: '#51b9eb',
    950: '#000000',
  },
}

SCSS

$custom: #51b9eb;
$custom-light: #91cef1;
$custom-dark: #000000;

JSON

{
  "hex": "#51b9eb",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 235
  },
  "hsl": {
    "h": 199.481,
    "s": 79.381,
    "l": 61.961
  },
  "oklch": {
    "l": 0.74507,
    "c": 0.11941,
    "h": 232.5
  },
  "luminance": 0.42445
}

Semantic roles & 50–950 ramp

primary

#51B9EB

secondary

#E8C2B0

accent

#4E0ADC

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B9EB

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

Preview Lab → · Contrast checker → · Palette generator →