#51B4DB#51B4DB

#51B4DB is a light, moderate cyan. Relative luminance 0.395; OKLCH L 72.7% C 0.108 H 227.1°. Best body text is #000000 at 8.90:1 contrast (WCAG AA passes).

Color values

HEX	#51B4DB
RGB	rgb(81, 180, 219)
HSL	hsl(197, 66%, 59%)
HSV	hsv(197, 63%, 86%)
CMYK	cmyk(63%, 17.8%, 0%, 14.1%)
CIE-LAB	lab(69.11, -17.25, -28.23)
CIE-LCH	lch(69.11, 33.08, 238.57°)
OKLab	oklab(72.66% -0.0733 -0.0788)
OKLCH	oklch(72.66% 0.108 227.1)
XYZ	xyz(32.4957, 39.5030, 72.9164)
Luminance	0.3951 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4DB #DB7851

analogous

#51DBBD #51B4DB #516FDB

triadic

#51B4DB #DB51B4 #B4DB51

tetradic

#51B4DB #BD51DB #DB7851 #6FDB51

square

#51B4DB #BD51DB #DB7851 #6FDB51

split-complementary

#51B4DB #DB516F #DBBD51

monochromatic

#1E7293 #299AC6 #51B4DB #84CAE5 #B6E0F0

Accessibility & contrast

On white

2.36

#51B4DB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.90

#51B4DB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4DB

8.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4DB	#FFFFFF	#000000	##000000
##51B4DB	1.00	2.36	8.90	8.90
#FFFFFF	2.36	1.00	21.00	21.00
#000000	8.90	21.00	1.00	1.00
##000000	8.90	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9FB1DD

Deuteranopia (green-blind)

#8CA2DB

Tritanopia (blue-blind)

#00BFC1

Achromatopsia (no color)

#A9A9A9

Design tokens & code

CSS

--color: #51b4db;
/* rgb */ color: rgb(81, 180, 219);
/* oklch */ color: oklch(72.7% 0.108 227.1);

Tailwind

colors: {
  custom: {
    50: '#8fcae6',
    500: '#51b4db',
    950: '#000000',
  },
}

SCSS

$custom: #51b4db;
$custom-light: #8fcae6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4db",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 219
  },
  "hsl": {
    "h": 196.957,
    "s": 65.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.7266,
    "c": 0.10767,
    "h": 227.1
  },
  "luminance": 0.39506
}

Semantic roles & 50–950 ramp

primary

#51B4DB

secondary

#DFB8A9

accent

#6F3FE9

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4DB

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

Preview Lab → · Contrast checker → · Palette generator →