#51C5EE#51C5EE

#51C5EE is a light, moderate cyan. Relative luminance 0.479; OKLCH L 77.4% C 0.118 H 225.0°. Best body text is #000000 at 10.57:1 contrast (WCAG AA passes).

Color values

HEX	#51C5EE
RGB	rgb(81, 197, 238)
HSL	hsl(196, 82%, 63%)
HSV	hsv(196, 66%, 93%)
CMYK	cmyk(66%, 17.2%, 0%, 6.7%)
CIE-LAB	lab(74.73, -20.22, -29.91)
CIE-LCH	lch(74.73, 36.10, 235.95°)
OKLab	oklab(77.38% -0.0837 -0.0836)
OKLCH	oklch(77.38% 0.118 225)
XYZ	xyz(38.7860, 47.8507, 88.0644)
Luminance	0.4785 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C5EE #EE7A51

analogous

#51EEC9 #51C5EE #5176EE

triadic

#51C5EE #EE51C5 #C5EE51

tetradic

#51C5EE #C951EE #EE7A51 #76EE51

square

#51C5EE #C951EE #EE7A51 #76EE51

split-complementary

#51C5EE #EE5176 #EEC951

monochromatic

#1189B3 #19B2E9 #51C5EE #89D8F3 #C1EAF9

Accessibility & contrast

On white

1.99

#51C5EE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.57

#51C5EE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C5EE

10.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C5EE	#FFFFFF	#000000	##000000
##51C5EE	1.00	1.99	10.57	10.57
#FFFFFF	1.99	1.00	21.00	21.00
#000000	10.57	21.00	1.00	1.00
##000000	10.57	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AEC1F0

Deuteranopia (green-blind)

#98B1EE

Tritanopia (blue-blind)

#00D1D2

Achromatopsia (no color)

#B8B8B8

Design tokens & code

CSS

--color: #51c5ee;
/* rgb */ color: rgb(81, 197, 238);
/* oklch */ color: oklch(77.4% 0.118 225.0);

Tailwind

colors: {
  custom: {
    50: '#92d6f3',
    500: '#51c5ee',
    950: '#000000',
  },
}

SCSS

$custom: #51c5ee;
$custom-light: #92d6f3;
$custom-dark: #000000;

JSON

{
  "hex": "#51c5ee",
  "rgb": {
    "r": 81,
    "g": 197,
    "b": 238
  },
  "hsl": {
    "h": 195.669,
    "s": 82.199,
    "l": 62.549
  },
  "oklch": {
    "l": 0.77384,
    "c": 0.11826,
    "h": 225
  },
  "luminance": 0.47855
}

Semantic roles & 50–950 ramp

primary

#51C5EE

secondary

#EAC0B1

accent

#3F07DF

background

#F9FDFE

surface

#F2FAFD

border

#CCD3D5

text

#0E1417

muted

#7E8385

Preview Lab

Preview with #51C5EE

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

Preview Lab → · Contrast checker → · Palette generator →