#51B6DF#51B6DF

#51B6DF is a light, moderate cyan. Relative luminance 0.405; OKLCH L 73.3% C 0.110 H 227.9°. Best body text is #000000 at 9.11:1 contrast (WCAG AA passes).

Color values

HEX	#51B6DF
RGB	rgb(81, 182, 223)
HSL	hsl(197, 69%, 60%)
HSV	hsv(197, 64%, 87%)
CMYK	cmyk(63.7%, 18.4%, 0%, 12.5%)
CIE-LAB	lab(69.84, -17.06, -29.29)
CIE-LCH	lch(69.84, 33.90, 239.78°)
OKLab	oklab(73.29% -0.074 -0.0819)
OKLCH	oklch(73.29% 0.11 227.9)
XYZ	xyz(33.4353, 40.5295, 75.8586)
Luminance	0.4053 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B6DF #DF7A51

analogous

#51DFC1 #51B6DF #516FDF

triadic

#51B6DF #DF51B6 #B6DF51

tetradic

#51B6DF #C151DF #DF7A51 #6FDF51

square

#51B6DF #C151DF #DF7A51 #6FDF51

split-complementary

#51B6DF #DF516F #DFC151

monochromatic

#1C7599 #269DCD #51B6DF #85CCE9 #B8E1F2

Accessibility & contrast

On white

2.31

#51B6DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.11

#51B6DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B6DF

9.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B6DF	#FFFFFF	#000000	##000000
##51B6DF	1.00	2.31	9.11	9.11
#FFFFFF	2.31	1.00	21.00	21.00
#000000	9.11	21.00	1.00	1.00
##000000	9.11	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B3E1

Deuteranopia (green-blind)

#8DA4DE

Tritanopia (blue-blind)

#00C2C3

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b6df;
/* rgb */ color: rgb(81, 182, 223);
/* oklch */ color: oklch(73.3% 0.110 227.9);

Tailwind

colors: {
  custom: {
    50: '#90cce9',
    500: '#51b6df',
    950: '#000000',
  },
}

SCSS

$custom: #51b6df;
$custom-light: #90cce9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b6df",
  "rgb": {
    "r": 81,
    "g": 182,
    "b": 223
  },
  "hsl": {
    "h": 197.324,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.73293,
    "c": 0.11032,
    "h": 227.9
  },
  "luminance": 0.40533
}

Semantic roles & 50–950 ramp

primary

#51B6DF

secondary

#E1BAAA

accent

#6F3CEC

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B6DF

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

Preview Lab → · Contrast checker → · Palette generator →