#51B9DC#51B9DC

#51B9DC is a light, moderate cyan. Relative luminance 0.416; OKLCH L 73.9% C 0.108 H 223.4°. Best body text is #000000 at 9.32:1 contrast (WCAG AA passes).

Color values

HEX	#51B9DC
RGB	rgb(81, 185, 220)
HSL	hsl(195, 67%, 59%)
HSV	hsv(195, 63%, 86%)
CMYK	cmyk(63.2%, 15.9%, 0%, 13.7%)
CIE-LAB	lab(70.60, -19.55, -26.49)
CIE-LCH	lch(70.60, 32.92, 233.57°)
OKLab	oklab(73.86% -0.0781 -0.0739)
OKLCH	oklch(73.86% 0.108 223.4)
XYZ	xyz(33.6554, 41.6111, 73.9543)
Luminance	0.4162 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B9DC #DC7451

analogous

#51DCBA #51B9DC #5174DC

triadic

#51B9DC #DC51B9 #B9DC51

tetradic

#51B9DC #BA51DC #DC7451 #74DC51

square

#51B9DC #BA51DC #DC7451 #74DC51

split-complementary

#51B9DC #DC5174 #DCBA51

monochromatic

#1E7795 #289FC8 #51B9DC #84CDE6 #B7E2F0

Accessibility & contrast

On white

2.25

#51B9DC on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.32

#51B9DC on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9DC

9.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B9DC	#FFFFFF	#000000	##000000
##51B9DC	1.00	2.25	9.32	9.32
#FFFFFF	2.25	1.00	21.00	21.00
#000000	9.32	21.00	1.00	1.00
##000000	9.32	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A5B5DE

Deuteranopia (green-blind)

#91A6DC

Tritanopia (blue-blind)

#00C4C4

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #51b9dc;
/* rgb */ color: rgb(81, 185, 220);
/* oklch */ color: oklch(73.9% 0.108 223.4);

Tailwind

colors: {
  custom: {
    50: '#90cee7',
    500: '#51b9dc',
    950: '#000000',
  },
}

SCSS

$custom: #51b9dc;
$custom-light: #90cee7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b9dc",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 220
  },
  "hsl": {
    "h": 195.108,
    "s": 66.507,
    "l": 59.02
  },
  "oklch": {
    "l": 0.73861,
    "c": 0.10753,
    "h": 223.4
  },
  "luminance": 0.41615
}

Semantic roles & 50–950 ramp

primary

#51B9DC

secondary

#E0B7A9

accent

#693EE9

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B9DC

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

Preview Lab → · Contrast checker → · Palette generator →