#51BCD4#51BCD4

#51BCD4 is a light, moderate cyan. Relative luminance 0.425; OKLCH L 74.2% C 0.103 H 215.0°. Best body text is #000000 at 9.49:1 contrast (WCAG AA passes).

Color values

HEX	#51BCD4
RGB	rgb(81, 188, 212)
HSL	hsl(191, 60%, 57%)
HSV	hsv(191, 62%, 83%)
CMYK	cmyk(61.8%, 11.3%, 0%, 16.9%)
CIE-LAB	lab(71.19, -23.50, -21.23)
CIE-LCH	lch(71.19, 31.66, 222.09°)
OKLab	oklab(74.24% -0.0843 -0.0589)
OKLCH	oklch(74.24% 0.103 215)
XYZ	xyz(33.2554, 42.4658, 68.7187)
Luminance	0.4247 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BCD4 #D46951

analogous

#51D4AA #51BCD4 #517BD4

triadic

#51BCD4 #D451BC #BCD451

tetradic

#51BCD4 #AA51D4 #D46951 #7BD451

square

#51BCD4 #AA51D4 #D46951 #7BD451

split-complementary

#51BCD4 #D4517B #D4AA51

monochromatic

#227689 #2EA0BA #51BCD4 #82CFE0 #B3E2EC

Accessibility & contrast

On white

2.21

#51BCD4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.49

#51BCD4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BCD4

9.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BCD4	#FFFFFF	#000000	##000000
##51BCD4	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)

#ABB6D5

Deuteranopia (green-blind)

#98A8D4

Tritanopia (blue-blind)

#00C5C3

Achromatopsia (no color)

#AEAEAE

Design tokens & code

CSS

--color: #51bcd4;
/* rgb */ color: rgb(81, 188, 212);
/* oklch */ color: oklch(74.2% 0.103 215.0);

Tailwind

colors: {
  custom: {
    50: '#8fd0e1',
    500: '#51bcd4',
    950: '#000000',
  },
}

SCSS

$custom: #51bcd4;
$custom-light: #8fd0e1;
$custom-dark: #000000;

JSON

{
  "hex": "#51bcd4",
  "rgb": {
    "r": 81,
    "g": 188,
    "b": 212
  },
  "hsl": {
    "h": 190.992,
    "s": 60.369,
    "l": 57.451
  },
  "oklch": {
    "l": 0.74239,
    "c": 0.10289,
    "h": 215
  },
  "luminance": 0.42469
}

Semantic roles & 50–950 ramp

primary

#51BCD4

secondary

#DBB0A6

accent

#6144E4

background

#F9FCFD

surface

#F2F9FB

border

#CCD2D4

text

#0E1415

muted

#7E8283

Preview Lab

Preview with #51BCD4

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

Preview Lab → · Contrast checker → · Palette generator →