#51B4DF#51B4DF

#51B4DF is a light, moderate cyan. Relative luminance 0.397; OKLCH L 72.8% C 0.111 H 229.6°. Best body text is #000000 at 8.94:1 contrast (WCAG AA passes).

Color values

HEX	#51B4DF
RGB	rgb(81, 180, 223)
HSL	hsl(198, 69%, 60%)
HSV	hsv(198, 64%, 87%)
CMYK	cmyk(63.7%, 19.3%, 0%, 12.5%)
CIE-LAB	lab(69.27, -16.01, -30.18)
CIE-LCH	lch(69.27, 34.17, 242.06°)
OKLab	oklab(72.83% -0.0719 -0.0844)
OKLCH	oklch(72.83% 0.111 229.6)
XYZ	xyz(33.0286, 39.7161, 75.7231)
Luminance	0.3972 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4DF #DF7C51

analogous

#51DFC3 #51B4DF #516DDF

triadic

#51B4DF #DF51B4 #B4DF51

tetradic

#51B4DF #C351DF #DF7C51 #6DDF51

square

#51B4DF #C351DF #DF7C51 #6DDF51

split-complementary

#51B4DF #DF516D #DFC351

monochromatic

#1C7399 #269ACD #51B4DF #85CAE9 #B8E1F2

Accessibility & contrast

On white

2.35

#51B4DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.94

#51B4DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4DF

8.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4DF	#FFFFFF	#000000	##000000
##51B4DF	1.00	2.35	8.94	8.94
#FFFFFF	2.35	1.00	21.00	21.00
#000000	8.94	21.00	1.00	1.00
##000000	8.94	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB1E1

Deuteranopia (green-blind)

#8AA3DE

Tritanopia (blue-blind)

#00C0C2

Achromatopsia (no color)

#A9A9A9

Design tokens & code

CSS

--color: #51b4df;
/* rgb */ color: rgb(81, 180, 223);
/* oklch */ color: oklch(72.8% 0.111 229.6);

Tailwind

colors: {
  custom: {
    50: '#90cae9',
    500: '#51b4df',
    950: '#000000',
  },
}

SCSS

$custom: #51b4df;
$custom-light: #90cae9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4df",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 223
  },
  "hsl": {
    "h": 198.169,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.72832,
    "c": 0.11088,
    "h": 229.6
  },
  "luminance": 0.3972
}

Semantic roles & 50–950 ramp

primary

#51B4DF

secondary

#E1BBAA

accent

#713CEC

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4DF

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

Preview Lab → · Contrast checker → · Palette generator →