#51D9FD#51D9FD

#51D9FD is a very light, vivid cyan. Relative luminance 0.585; OKLCH L 82.6% C 0.126 H 218.9°. Best body text is #000000 at 12.69:1 contrast (WCAG AA passes).

Color values

HEX	#51D9FD
RGB	rgb(81, 217, 253)
HSL	hsl(193, 98%, 65%)
HSV	hsv(193, 68%, 99%)
CMYK	cmyk(68%, 14.2%, 0%, 0.8%)
CIE-LAB	lab(80.99, -25.72, -28.32)
CIE-LCH	lch(80.99, 38.25, 227.75°)
OKLab	oklab(82.58% -0.0978 -0.079)
OKLCH	oklch(82.58% 0.126 218.9)
XYZ	xyz(45.9285, 58.4617, 101.7732)
Luminance	0.5847 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51D9FD #FD7551

analogous

#51FDCB #51D9FD #5183FD

triadic

#51D9FD #FD51D9 #D9FD51

tetradic

#51D9FD #CB51FD #FD7551 #83FD51

square

#51D9FD #CB51FD #FD7551 #83FD51

split-complementary

#51D9FD #FD5183 #FDCB51

monochromatic

#02A6D1 #14CCFC #51D9FD #8EE6FE #CAF3FE

Accessibility & contrast

On white

1.65

#51D9FD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

12.69

#51D9FD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51D9FD

12.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51D9FD	#FFFFFF	#000000	##000000
##51D9FD	1.00	1.65	12.69	12.69
#FFFFFF	1.65	1.00	21.00	21.00
#000000	12.69	21.00	1.00	1.00
##000000	12.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C2D3FF

Deuteranopia (green-blind)

#AAC1FD

Tritanopia (blue-blind)

#00E5E4

Achromatopsia (no color)

#C9C9C9

Design tokens & code

CSS

--color: #51d9fd;
/* rgb */ color: rgb(81, 217, 253);
/* oklch */ color: oklch(82.6% 0.126 218.9);

Tailwind

colors: {
  custom: {
    50: '#95e5fe',
    500: '#51d9fd',
    950: '#000000',
  },
}

SCSS

$custom: #51d9fd;
$custom-light: #95e5fe;
$custom-dark: #000000;

JSON

{
  "hex": "#51d9fd",
  "rgb": {
    "r": 81,
    "g": 217,
    "b": 253
  },
  "hsl": {
    "h": 192.558,
    "s": 97.727,
    "l": 65.49
  },
  "oklch": {
    "l": 0.82583,
    "c": 0.12569,
    "h": 218.9
  },
  "luminance": 0.58467
}

Semantic roles & 50–950 ramp

primary

#51D9FD

secondary

#CC4926

accent

#3000E6

background

#FCFEFF

surface

#F5FCFF

border

#CFD5D7

text

#0F1517

muted

#808485

Preview Lab

Preview with #51D9FD

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

Preview Lab → · Contrast checker → · Palette generator →