#51BDE9#51BDE9

#51BDE9 is a light, moderate cyan. Relative luminance 0.440; OKLCH L 75.3% C 0.116 H 228.2°. Best body text is #000000 at 9.81:1 contrast (WCAG AA passes).

Color values

HEX	#51BDE9
RGB	rgb(81, 189, 233)
HSL	hsl(197, 78%, 62%)
HSV	hsv(197, 65%, 91%)
CMYK	cmyk(65.2%, 18.9%, 0%, 8.6%)
CIE-LAB	lab(72.24, -17.62, -31.04)
CIE-LCH	lch(72.24, 35.69, 240.41°)
OKLab	oklab(75.33% -0.0775 -0.0868)
OKLCH	oklch(75.33% 0.116 228.2)
XYZ	xyz(36.2931, 44.0238, 83.6597)
Luminance	0.4403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDE9 #E97D51

analogous

#51E9C9 #51BDE9 #5171E9

triadic

#51BDE9 #E951BD #BDE951

tetradic

#51BDE9 #C951E9 #E97D51 #71E951

square

#51BDE9 #C951E9 #E97D51 #71E951

split-complementary

#51BDE9 #E95171 #E9C951

monochromatic

#167FAA #1CA8E0 #51BDE9 #87D2F0 #BEE6F7

Accessibility & contrast

On white

2.14

#51BDE9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.81

#51BDE9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDE9

9.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDE9	#FFFFFF	#000000	##000000
##51BDE9	1.00	2.14	9.81	9.81
#FFFFFF	2.14	1.00	21.00	21.00
#000000	9.81	21.00	1.00	1.00
##000000	9.81	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A6BAEB

Deuteranopia (green-blind)

#91AAE8

Tritanopia (blue-blind)

#00CACB

Achromatopsia (no color)

#B1B1B1

Design tokens & code

CSS

--color: #51bde9;
/* rgb */ color: rgb(81, 189, 233);
/* oklch */ color: oklch(75.3% 0.116 228.2);

Tailwind

colors: {
  custom: {
    50: '#91d1f0',
    500: '#51bde9',
    950: '#000000',
  },
}

SCSS

$custom: #51bde9;
$custom-light: #91d1f0;
$custom-dark: #000000;

JSON

{
  "hex": "#51bde9",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 233
  },
  "hsl": {
    "h": 197.368,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.75335,
    "c": 0.11636,
    "h": 228.2
  },
  "luminance": 0.44028
}

Semantic roles & 50–950 ramp

primary

#51BDE9

secondary

#E7BFAF

accent

#470CDA

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDE9

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

Preview Lab → · Contrast checker → · Palette generator →