#51C5DD#51C5DD

#51C5DD is a light, moderate cyan. Relative luminance 0.469; OKLCH L 76.7% C 0.108 H 213.7°. Best body text is #000000 at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#51C5DD
RGB	rgb(81, 197, 221)
HSL	hsl(190, 67%, 59%)
HSV	hsv(190, 63%, 87%)
CMYK	cmyk(63.3%, 10.9%, 0%, 13.3%)
CIE-LAB	lab(74.12, -25.35, -21.65)
CIE-LCH	lch(74.12, 33.34, 220.50°)
OKLab	oklab(76.7% -0.0901 -0.0602)
OKLCH	oklch(76.7% 0.108 213.7)
XYZ	xyz(36.4053, 46.8984, 75.5263)
Luminance	0.4690 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C5DD #DD6951

analogous

#51DDAF #51C5DD #517FDD

triadic

#51C5DD #DD51C5 #C5DD51

tetradic

#51C5DD #AF51DD #DD6951 #7FDD51

square

#51C5DD #AF51DD #DD6951 #7FDD51

split-complementary

#51C5DD #DD517F #DDAF51

monochromatic

#1D8296 #27AEC9 #51C5DD #84D6E7 #B7E7F1

Accessibility & contrast

On white

2.02

#51C5DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.38

#51C5DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C5DD

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C5DD	#FFFFFF	#000000	##000000
##51C5DD	1.00	2.02	10.38	10.38
#FFFFFF	2.02	1.00	21.00	21.00
#000000	10.38	21.00	1.00	1.00
##000000	10.38	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B3BFDE

Deuteranopia (green-blind)

#9FB0DD

Tritanopia (blue-blind)

#00CECC

Achromatopsia (no color)

#B6B6B6

Design tokens & code

CSS

--color: #51c5dd;
/* rgb */ color: rgb(81, 197, 221);
/* oklch */ color: oklch(76.7% 0.108 213.7);

Tailwind

colors: {
  custom: {
    50: '#91d6e7',
    500: '#51c5dd',
    950: '#000000',
  },
}

SCSS

$custom: #51c5dd;
$custom-light: #91d6e7;
$custom-dark: #000000;

JSON

{
  "hex": "#51c5dd",
  "rgb": {
    "r": 81,
    "g": 197,
    "b": 221
  },
  "hsl": {
    "h": 190.286,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.76697,
    "c": 0.10835,
    "h": 213.7
  },
  "luminance": 0.46902
}

Semantic roles & 50–950 ramp

primary

#51C5DD

secondary

#E0B3AA

accent

#5B3EEA

background

#F9FDFE

surface

#F2FAFC

border

#CCD3D5

text

#0E1416

muted

#7E8384

Preview Lab

Preview with #51C5DD

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

Preview Lab → · Contrast checker → · Palette generator →