#51BDD5#51BDD5

#51BDD5 is a light, moderate cyan. Relative luminance 0.429; OKLCH L 74.5% C 0.103 H 214.8°. Best body text is #000000 at 9.59:1 contrast (WCAG AA passes).

Color values

HEX	#51BDD5
RGB	rgb(81, 189, 213)
HSL	hsl(191, 61%, 58%)
HSV	hsv(191, 62%, 84%)
CMYK	cmyk(62%, 11.3%, 0%, 16.5%)
CIE-LAB	lab(71.52, -23.71, -21.27)
CIE-LCH	lch(71.52, 31.85, 221.90°)
OKLab	oklab(74.51% -0.085 -0.0591)
OKLCH	oklch(74.51% 0.104 214.8)
XYZ	xyz(33.5963, 42.9451, 69.4566)
Luminance	0.4295 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDD5 #D56951

analogous

#51D5AB #51BDD5 #517BD5

triadic

#51BDD5 #D551BD #BDD551

tetradic

#51BDD5 #AB51D5 #D56951 #7BD551

square

#51BDD5 #AB51D5 #D56951 #7BD551

split-complementary

#51BDD5 #D5517B #D5AB51

monochromatic

#21778A #2DA2BC #51BDD5 #82D0E1 #B4E2ED

Accessibility & contrast

On white

2.19

#51BDD5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.59

#51BDD5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDD5

9.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDD5	#FFFFFF	#000000	##000000
##51BDD5	1.00	2.19	9.59	9.59
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.59	21.00	1.00	1.00
##000000	9.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#ACB7D6

Deuteranopia (green-blind)

#99A9D5

Tritanopia (blue-blind)

#00C6C4

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #51bdd5;
/* rgb */ color: rgb(81, 189, 213);
/* oklch */ color: oklch(74.5% 0.103 214.8);

Tailwind

colors: {
  custom: {
    50: '#8fd1e2',
    500: '#51bdd5',
    950: '#000000',
  },
}

SCSS

$custom: #51bdd5;
$custom-light: #8fd1e2;
$custom-dark: #000000;

JSON

{
  "hex": "#51bdd5",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 213
  },
  "hsl": {
    "h": 190.909,
    "s": 61.111,
    "l": 57.647
  },
  "oklch": {
    "l": 0.74512,
    "c": 0.1035,
    "h": 214.8
  },
  "luminance": 0.42949
}

Semantic roles & 50–950 ramp

primary

#51BDD5

secondary

#DBB0A6

accent

#6144E4

background

#F9FCFD

surface

#F2F9FB

border

#CCD2D4

text

#0E1415

muted

#7E8283

Preview Lab

Preview with #51BDD5

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

Preview Lab → · Contrast checker → · Palette generator →