#51B7DF#51B7DF

#51B7DF is a light, moderate cyan. Relative luminance 0.409; OKLCH L 73.5% C 0.110 H 227.1°. Best body text is #000000 at 9.19:1 contrast (WCAG AA passes).

Color values

HEX	#51B7DF
RGB	rgb(81, 183, 223)
HSL	hsl(197, 69%, 60%)
HSV	hsv(197, 64%, 87%)
CMYK	cmyk(63.7%, 17.9%, 0%, 12.5%)
CIE-LAB	lab(70.13, -17.59, -28.85)
CIE-LCH	lch(70.13, 33.79, 238.63°)
OKLab	oklab(73.52% -0.075 -0.0806)
OKLCH	oklch(73.52% 0.11 227.1)
XYZ	xyz(33.6408, 40.9405, 75.9271)
Luminance	0.4094 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B7DF #DF7951

analogous

#51DFC0 #51B7DF #5170DF

triadic

#51B7DF #DF51B7 #B7DF51

tetradic

#51B7DF #C051DF #DF7951 #70DF51

square

#51B7DF #C051DF #DF7951 #70DF51

split-complementary

#51B7DF #DF5170 #DFC051

monochromatic

#1C7699 #269ECD #51B7DF #85CCE9 #B8E2F2

Accessibility & contrast

On white

2.29

#51B7DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.19

#51B7DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7DF

9.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B7DF	#FFFFFF	#000000	##000000
##51B7DF	1.00	2.29	9.19	9.19
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.19	21.00	1.00	1.00
##000000	9.19	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A2B4E1

Deuteranopia (green-blind)

#8EA5DF

Tritanopia (blue-blind)

#00C3C4

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b7df;
/* rgb */ color: rgb(81, 183, 223);
/* oklch */ color: oklch(73.5% 0.110 227.1);

Tailwind

colors: {
  custom: {
    50: '#90cce9',
    500: '#51b7df',
    950: '#000000',
  },
}

SCSS

$custom: #51b7df;
$custom-light: #90cce9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b7df",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 223
  },
  "hsl": {
    "h": 196.901,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.73524,
    "c": 0.11007,
    "h": 227.1
  },
  "luminance": 0.40944
}

Semantic roles & 50–950 ramp

primary

#51B7DF

secondary

#E1BAAA

accent

#6E3CEC

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B7DF

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

Preview Lab → · Contrast checker → · Palette generator →