#51B3DF#51B3DF

#51B3DF is a light, moderate cyan. Relative luminance 0.393; OKLCH L 72.6% C 0.111 H 230.4°. Best body text is #000000 at 8.86:1 contrast (WCAG AA passes).

Color values

HEX	#51B3DF
RGB	rgb(81, 179, 223)
HSL	hsl(199, 69%, 60%)
HSV	hsv(199, 64%, 87%)
CMYK	cmyk(63.7%, 19.7%, 0%, 12.5%)
CIE-LAB	lab(68.98, -15.48, -30.63)
CIE-LCH	lch(68.98, 34.32, 243.19°)
OKLab	oklab(72.6% -0.0709 -0.0857)
OKLCH	oklch(72.6% 0.111 230.4)
XYZ	xyz(32.8275, 39.3138, 75.6560)
Luminance	0.3932 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B3DF #DF7D51

analogous

#51DFC4 #51B3DF #516CDF

triadic

#51B3DF #DF51B3 #B3DF51

tetradic

#51B3DF #C451DF #DF7D51 #6CDF51

square

#51B3DF #C451DF #DF7D51 #6CDF51

split-complementary

#51B3DF #DF516C #DFC451

monochromatic

#1C7399 #2699CD #51B3DF #85CAE9 #B8E0F2

Accessibility & contrast

On white

2.37

#51B3DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.86

#51B3DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B3DF

8.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B3DF	#FFFFFF	#000000	##000000
##51B3DF	1.00	2.37	8.86	8.86
#FFFFFF	2.37	1.00	21.00	21.00
#000000	8.86	21.00	1.00	1.00
##000000	8.86	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB1E1

Deuteranopia (green-blind)

#89A2DE

Tritanopia (blue-blind)

#00BFC1

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #51b3df;
/* rgb */ color: rgb(81, 179, 223);
/* oklch */ color: oklch(72.6% 0.111 230.4);

Tailwind

colors: {
  custom: {
    50: '#90c9e9',
    500: '#51b3df',
    950: '#000000',
  },
}

SCSS

$custom: #51b3df;
$custom-light: #90c9e9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b3df",
  "rgb": {
    "r": 81,
    "g": 179,
    "b": 223
  },
  "hsl": {
    "h": 198.592,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.72602,
    "c": 0.1112,
    "h": 230.4
  },
  "luminance": 0.39317
}

Semantic roles & 50–950 ramp

primary

#51B3DF

secondary

#E1BBAA

accent

#723CEC

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B3DF

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

Preview Lab → · Contrast checker → · Palette generator →