#51BFEF#51BFEF

#51BFEF is a light, vivid cyan. Relative luminance 0.452; OKLCH L 76.1% C 0.121 H 230.1°. Best body text is #000000 at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#51BFEF
RGB	rgb(81, 191, 239)
HSL	hsl(198, 83%, 63%)
HSV	hsv(198, 66%, 94%)
CMYK	cmyk(66.1%, 20.1%, 0%, 6.3%)
CIE-LAB	lab(73.05, -16.79, -33.04)
CIE-LCH	lch(73.05, 37.06, 243.06°)
OKLab	oklab(76.05% -0.0774 -0.0925)
OKLCH	oklch(76.05% 0.121 230.1)
XYZ	xyz(37.5980, 45.2389, 88.3951)
Luminance	0.4524 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BFEF #EF8151

analogous

#51EFD0 #51BFEF #5170EF

triadic

#51BFEF #EF51BF #BFEF51

tetradic

#51BFEF #D051EF #EF8151 #70EF51

square

#51BFEF #D051EF #EF8151 #70EF51

split-complementary

#51BFEF #EF5170 #EFD051

monochromatic

#1183B5 #19AAEA #51BFEF #89D4F4 #C1E8F9

Accessibility & contrast

On white

2.09

#51BFEF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.05

#51BFEF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BFEF

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BFEF	#FFFFFF	#000000	##000000
##51BFEF	1.00	2.09	10.05	10.05
#FFFFFF	2.09	1.00	21.00	21.00
#000000	10.05	21.00	1.00	1.00
##000000	10.05	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A7BCF1

Deuteranopia (green-blind)

#91ACEE

Tritanopia (blue-blind)

#00CCCF

Achromatopsia (no color)

#B3B3B3

Design tokens & code

CSS

--color: #51bfef;
/* rgb */ color: rgb(81, 191, 239);
/* oklch */ color: oklch(76.1% 0.121 230.1);

Tailwind

colors: {
  custom: {
    50: '#92d2f4',
    500: '#51bfef',
    950: '#000000',
  },
}

SCSS

$custom: #51bfef;
$custom-light: #92d2f4;
$custom-dark: #000000;

JSON

{
  "hex": "#51bfef",
  "rgb": {
    "r": 81,
    "g": 191,
    "b": 239
  },
  "hsl": {
    "h": 198.228,
    "s": 83.158,
    "l": 62.745
  },
  "oklch": {
    "l": 0.76053,
    "c": 0.12063,
    "h": 230.1
  },
  "luminance": 0.45243
}

Semantic roles & 50–950 ramp

primary

#51BFEF

secondary

#EAC3B1

accent

#4806E0

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1417

muted

#7E8285

Preview Lab

Preview with #51BFEF

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

Preview Lab → · Contrast checker → · Palette generator →