#51BDE8#51BDE8

#51BDE8 is a light, moderate cyan. Relative luminance 0.440; OKLCH L 75.3% C 0.116 H 227.7°. Best body text is #000000 at 9.79:1 contrast (WCAG AA passes).

Color values

HEX	#51BDE8
RGB	rgb(81, 189, 232)
HSL	hsl(197, 77%, 61%)
HSV	hsv(197, 65%, 91%)
CMYK	cmyk(65.1%, 18.5%, 0%, 9%)
CIE-LAB	lab(72.21, -17.93, -30.55)
CIE-LCH	lch(72.21, 35.43, 239.59°)
OKLab	oklab(75.29% -0.0778 -0.0854)
OKLCH	oklch(75.29% 0.116 227.7)
XYZ	xyz(36.1506, 43.9669, 82.9095)
Luminance	0.4397 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDE8 #E87C51

analogous

#51E8C8 #51BDE8 #5172E8

triadic

#51BDE8 #E851BD #BDE851

tetradic

#51BDE8 #C851E8 #E87C51 #72E851

square

#51BDE8 #C851E8 #E87C51 #72E851

split-complementary

#51BDE8 #E85172 #E8C851

monochromatic

#167FA8 #1DA7DE #51BDE8 #87D2EF #BDE6F6

Accessibility & contrast

On white

2.14

#51BDE8 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.79

#51BDE8 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDE8

9.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDE8	#FFFFFF	#000000	##000000
##51BDE8	1.00	2.14	9.79	9.79
#FFFFFF	2.14	1.00	21.00	21.00
#000000	9.79	21.00	1.00	1.00
##000000	9.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A6BAEA

Deuteranopia (green-blind)

#91AAE7

Tritanopia (blue-blind)

#00C9CB

Achromatopsia (no color)

#B1B1B1

Design tokens & code

CSS

--color: #51bde8;
/* rgb */ color: rgb(81, 189, 232);
/* oklch */ color: oklch(75.3% 0.116 227.7);

Tailwind

colors: {
  custom: {
    50: '#91d1ef',
    500: '#51bde8',
    950: '#000000',
  },
}

SCSS

$custom: #51bde8;
$custom-light: #91d1ef;
$custom-dark: #000000;

JSON

{
  "hex": "#51bde8",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 232
  },
  "hsl": {
    "h": 197.086,
    "s": 76.65,
    "l": 61.373
  },
  "oklch": {
    "l": 0.75292,
    "c": 0.11558,
    "h": 227.7
  },
  "luminance": 0.43971
}

Semantic roles & 50–950 ramp

primary

#51BDE8

secondary

#E7BEAE

accent

#470DD9

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDE8

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

Preview Lab → · Contrast checker → · Palette generator →