#51B2DD#51B2DD

#51B2DD is a light, moderate cyan. Relative luminance 0.388; OKLCH L 72.3% C 0.110 H 230.0°. Best body text is #000000 at 8.76:1 contrast (WCAG AA passes).

Color values

HEX	#51B2DD
RGB	rgb(81, 178, 221)
HSL	hsl(198, 67%, 59%)
HSV	hsv(198, 63%, 87%)
CMYK	cmyk(63.3%, 19.5%, 0%, 13.3%)
CIE-LAB	lab(68.61, -15.57, -30.10)
CIE-LCH	lch(68.61, 33.89, 242.65°)
OKLab	oklab(72.28% -0.0705 -0.0842)
OKLCH	oklch(72.28% 0.11 230)
XYZ	xyz(32.3598, 38.8072, 74.1778)
Luminance	0.3881 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B2DD #DD7C51

analogous

#51DDC2 #51B2DD #516CDD

triadic

#51B2DD #DD51B2 #B2DD51

tetradic

#51B2DD #C251DD #DD7C51 #6CDD51

square

#51B2DD #C251DD #DD7C51 #6CDD51

split-complementary

#51B2DD #DD516C #DDC251

monochromatic

#1D7196 #2798C9 #51B2DD #84C9E7 #B7DFF1

Accessibility & contrast

On white

2.40

#51B2DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.76

#51B2DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B2DD

8.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B2DD	#FFFFFF	#000000	##000000
##51B2DD	1.00	2.40	8.76	8.76
#FFFFFF	2.40	1.00	21.00	21.00
#000000	8.76	21.00	1.00	1.00
##000000	8.76	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CAFDF

Deuteranopia (green-blind)

#89A1DC

Tritanopia (blue-blind)

#00BEC0

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #51b2dd;
/* rgb */ color: rgb(81, 178, 221);
/* oklch */ color: oklch(72.3% 0.110 230.0);

Tailwind

colors: {
  custom: {
    50: '#8fc9e7',
    500: '#51b2dd',
    950: '#000000',
  },
}

SCSS

$custom: #51b2dd;
$custom-light: #8fc9e7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b2dd",
  "rgb": {
    "r": 81,
    "g": 178,
    "b": 221
  },
  "hsl": {
    "h": 198.429,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.72284,
    "c": 0.10983,
    "h": 230
  },
  "luminance": 0.38811
}

Semantic roles & 50–950 ramp

primary

#51B2DD

secondary

#E0BAAA

accent

#733EEA

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B2DD

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

Preview Lab → · Contrast checker → · Palette generator →