#51B9F2#51B9F2

#51B9F2 is a light, vivid cyan. Relative luminance 0.429; OKLCH L 74.8% C 0.126 H 236.0°. Best body text is #000000 at 9.57:1 contrast (WCAG AA passes).

Color values

HEX	#51B9F2
RGB	rgb(81, 185, 242)
HSL	hsl(201, 86%, 63%)
HSV	hsv(201, 67%, 95%)
CMYK	cmyk(66.5%, 23.6%, 0%, 5.1%)
CIE-LAB	lab(71.46, -12.66, -37.13)
CIE-LCH	lch(71.46, 39.23, 251.17°)
OKLab	oklab(74.82% -0.0704 -0.1043)
OKLCH	oklch(74.82% 0.126 236)
XYZ	xyz(36.7631, 42.8541, 90.3214)
Luminance	0.4286 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B9F2 #F28A51

analogous

#51F2DA #51B9F2 #5168F2

triadic

#51B9F2 #F251B9 #B9F251

tetradic

#51B9F2 #DA51F2 #F28A51 #68F251

square

#51B9F2 #DA51F2 #F28A51 #68F251

split-complementary

#51B9F2 #F25168 #F2DA51

monochromatic

#0E7EBB #18A2EE #51B9F2 #8AD0F6 #C3E7FB

Accessibility & contrast

On white

2.19

#51B9F2 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.57

#51B9F2 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9F2

9.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B9F2	#FFFFFF	#000000	##000000
##51B9F2	1.00	2.19	9.57	9.57
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.57	21.00	1.00	1.00
##000000	9.57	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB8F5

Deuteranopia (green-blind)

#88A8F1

Tritanopia (blue-blind)

#00C8CC

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #51b9f2;
/* rgb */ color: rgb(81, 185, 242);
/* oklch */ color: oklch(74.8% 0.126 236.0);

Tailwind

colors: {
  custom: {
    50: '#92cef6',
    500: '#51b9f2',
    950: '#000000',
  },
}

SCSS

$custom: #51b9f2;
$custom-light: #92cef6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b9f2",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 242
  },
  "hsl": {
    "h": 201.242,
    "s": 86.096,
    "l": 63.333
  },
  "oklch": {
    "l": 0.74824,
    "c": 0.12588,
    "h": 236
  },
  "luminance": 0.42858
}

Semantic roles & 50–950 ramp

primary

#51B9F2

secondary

#ECC7B3

accent

#5203E3

background

#F9FCFF

surface

#F2F9FE

border

#CCD2D6

text

#0E1317

muted

#7E8285

Preview Lab

Preview with #51B9F2

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

Preview Lab → · Contrast checker → · Palette generator →