#51C9F2#51C9F2

#51C9F2 is a light, vivid cyan. Relative luminance 0.499; OKLCH L 78.5% C 0.120 H 224.3°. Best body text is #000000 at 10.99:1 contrast (WCAG AA passes).

Color values

HEX	#51C9F2
RGB	rgb(81, 201, 242)
HSL	hsl(195, 86%, 63%)
HSV	hsv(195, 67%, 95%)
CMYK	cmyk(66.5%, 16.9%, 0%, 5.1%)
CIE-LAB	lab(76.03, -21.03, -30.07)
CIE-LCH	lch(76.03, 36.70, 235.03°)
OKLab	oklab(78.47% -0.0862 -0.084)
OKLCH	oklch(78.47% 0.12 224.3)
XYZ	xyz(40.3005, 49.9290, 91.5005)
Luminance	0.4993 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C9F2 #F27A51

analogous

#51F2CB #51C9F2 #5178F2

triadic

#51C9F2 #F251C9 #C9F251

tetradic

#51C9F2 #CB51F2 #F27A51 #78F251

square

#51C9F2 #CB51F2 #F27A51 #78F251

split-complementary

#51C9F2 #F25178 #F2CB51

monochromatic

#0E8FBB #18B7EE #51C9F2 #8ADBF6 #C3ECFB

Accessibility & contrast

On white

1.91

#51C9F2 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.99

#51C9F2 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C9F2

10.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C9F2	#FFFFFF	#000000	##000000
##51C9F2	1.00	1.91	10.99	10.99
#FFFFFF	1.91	1.00	21.00	21.00
#000000	10.99	21.00	1.00	1.00
##000000	10.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B2C5F4

Deuteranopia (green-blind)

#9CB4F2

Tritanopia (blue-blind)

#00D5D6

Achromatopsia (no color)

#BBBBBB

Design tokens & code

CSS

--color: #51c9f2;
/* rgb */ color: rgb(81, 201, 242);
/* oklch */ color: oklch(78.5% 0.120 224.3);

Tailwind

colors: {
  custom: {
    50: '#93d9f6',
    500: '#51c9f2',
    950: '#000000',
  },
}

SCSS

$custom: #51c9f2;
$custom-light: #93d9f6;
$custom-dark: #000000;

JSON

{
  "hex": "#51c9f2",
  "rgb": {
    "r": 81,
    "g": 201,
    "b": 242
  },
  "hsl": {
    "h": 195.28,
    "s": 86.096,
    "l": 63.333
  },
  "oklch": {
    "l": 0.78469,
    "c": 0.12037,
    "h": 224.3
  },
  "luminance": 0.49933
}

Semantic roles & 50–950 ramp

primary

#51C9F2

secondary

#ECC1B3

accent

#3C03E3

background

#F9FDFF

surface

#F2FAFE

border

#CCD3D6

text

#0E1417

muted

#7E8385

Preview Lab

Preview with #51C9F2

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

Preview Lab → · Contrast checker → · Palette generator →