#51B7DE#51B7DE

#51B7DE is a light, moderate cyan. Relative luminance 0.409; OKLCH L 73.5% C 0.109 H 226.4°. Best body text is #000000 at 9.18:1 contrast (WCAG AA passes).

Color values

HEX	#51B7DE
RGB	rgb(81, 183, 222)
HSL	hsl(197, 68%, 59%)
HSV	hsv(197, 64%, 87%)
CMYK	cmyk(63.5%, 17.6%, 0%, 12.9%)
CIE-LAB	lab(70.10, -17.90, -28.36)
CIE-LCH	lch(70.10, 33.53, 237.75°)
OKLab	oklab(73.48% -0.0753 -0.0792)
OKLCH	oklch(73.48% 0.109 226.4)
XYZ	xyz(33.5064, 40.8867, 75.2192)
Luminance	0.4089 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B7DE #DE7851

analogous

#51DEBF #51B7DE #5171DE

triadic

#51B7DE #DE51B7 #B7DE51

tetradic

#51B7DE #BF51DE #DE7851 #71DE51

square

#51B7DE #BF51DE #DE7851 #71DE51

split-complementary

#51B7DE #DE5171 #DEBF51

monochromatic

#1D7698 #279ECB #51B7DE #84CCE8 #B8E2F2

Accessibility & contrast

On white

2.29

#51B7DE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.18

#51B7DE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7DE

9.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B7DE	#FFFFFF	#000000	##000000
##51B7DE	1.00	2.29	9.18	9.18
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.18	21.00	1.00	1.00
##000000	9.18	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A2B4E0

Deuteranopia (green-blind)

#8EA5DE

Tritanopia (blue-blind)

#00C2C4

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b7de;
/* rgb */ color: rgb(81, 183, 222);
/* oklch */ color: oklch(73.5% 0.109 226.4);

Tailwind

colors: {
  custom: {
    50: '#90cce8',
    500: '#51b7de',
    950: '#000000',
  },
}

SCSS

$custom: #51b7de;
$custom-light: #90cce8;
$custom-dark: #000000;

JSON

{
  "hex": "#51b7de",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 222
  },
  "hsl": {
    "h": 196.596,
    "s": 68.116,
    "l": 59.412
  },
  "oklch": {
    "l": 0.73482,
    "c": 0.10931,
    "h": 226.4
  },
  "luminance": 0.4089
}

Semantic roles & 50–950 ramp

primary

#51B7DE

secondary

#E1B9AA

accent

#6D3DEB

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B7DE

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

Preview Lab → · Contrast checker → · Palette generator →