#51BDDF#51BDDF

#51BDDF is a light, moderate cyan. Relative luminance 0.435; OKLCH L 74.9% C 0.109 H 222.0°. Best body text is #000000 at 9.69:1 contrast (WCAG AA passes).

Color values

HEX	#51BDDF
RGB	rgb(81, 189, 223)
HSL	hsl(194, 69%, 60%)
HSV	hsv(194, 64%, 87%)
CMYK	cmyk(63.7%, 15.2%, 0%, 12.5%)
CIE-LAB	lab(71.87, -20.70, -26.18)
CIE-LCH	lch(71.87, 33.37, 231.67°)
OKLab	oklab(74.91% -0.0811 -0.073)
OKLCH	oklch(74.91% 0.109 222)
XYZ	xyz(34.9049, 43.4686, 76.3485)
Luminance	0.4347 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDDF #DF7351

analogous

#51DFBA #51BDDF #5176DF

triadic

#51BDDF #DF51BD #BDDF51

tetradic

#51BDDF #BA51DF #DF7351 #76DF51

square

#51BDDF #BA51DF #DF7351 #76DF51

split-complementary

#51BDDF #DF5176 #DFBA51

monochromatic

#1C7B99 #26A5CD #51BDDF #85D1E9 #B8E4F2

Accessibility & contrast

On white

2.17

#51BDDF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.69

#51BDDF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDDF

9.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDDF	#FFFFFF	#000000	##000000
##51BDDF	1.00	2.17	9.69	9.69
#FFFFFF	2.17	1.00	21.00	21.00
#000000	9.69	21.00	1.00	1.00
##000000	9.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A9B9E1

Deuteranopia (green-blind)

#95AADF

Tritanopia (blue-blind)

#00C8C8

Achromatopsia (no color)

#B0B0B0

Design tokens & code

CSS

--color: #51bddf;
/* rgb */ color: rgb(81, 189, 223);
/* oklch */ color: oklch(74.9% 0.109 222.0);

Tailwind

colors: {
  custom: {
    50: '#90d1e9',
    500: '#51bddf',
    950: '#000000',
  },
}

SCSS

$custom: #51bddf;
$custom-light: #90d1e9;
$custom-dark: #000000;

JSON

{
  "hex": "#51bddf",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 223
  },
  "hsl": {
    "h": 194.366,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.74914,
    "c": 0.10913,
    "h": 222
  },
  "luminance": 0.43472
}

Semantic roles & 50–950 ramp

primary

#51BDDF

secondary

#E1B8AA

accent

#663CEC

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDDF

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

Preview Lab → · Contrast checker → · Palette generator →