#51B7E4#51B7E4

#51B7E4 is a light, moderate cyan. Relative luminance 0.412; OKLCH L 73.7% C 0.114 H 230.1°. Best body text is #000000 at 9.24:1 contrast (WCAG AA passes).

Color values

HEX	#51B7E4
RGB	rgb(81, 183, 228)
HSL	hsl(198, 73%, 61%)
HSV	hsv(198, 64%, 89%)
CMYK	cmyk(64.5%, 19.7%, 0%, 10.6%)
CIE-LAB	lab(70.33, -16.03, -31.28)
CIE-LCH	lch(70.33, 35.15, 242.87°)
OKLab	oklab(73.74% -0.0732 -0.0875)
OKLCH	oklch(73.74% 0.114 230.1)
XYZ	xyz(34.3249, 41.2141, 79.5299)
Luminance	0.4122 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B7E4 #E47E51

analogous

#51E4C7 #51B7E4 #516EE4

triadic

#51B7E4 #E451B7 #B7E451

tetradic

#51B7E4 #C751E4 #E47E51 #6EE451

square

#51B7E4 #C751E4 #E47E51 #6EE451

split-complementary

#51B7E4 #E4516E #E4C751

monochromatic

#1978A2 #219FD7 #51B7E4 #86CDEC #BBE3F4

Accessibility & contrast

On white

2.27

#51B7E4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.24

#51B7E4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7E4

9.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B7E4	#FFFFFF	#000000	##000000
##51B7E4	1.00	2.27	9.24	9.24
#FFFFFF	2.27	1.00	21.00	21.00
#000000	9.24	21.00	1.00	1.00
##000000	9.24	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B4E6

Deuteranopia (green-blind)

#8CA5E3

Tritanopia (blue-blind)

#00C3C6

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #51b7e4;
/* rgb */ color: rgb(81, 183, 228);
/* oklch */ color: oklch(73.7% 0.114 230.1);

Tailwind

colors: {
  custom: {
    50: '#90ccec',
    500: '#51b7e4',
    950: '#000000',
  },
}

SCSS

$custom: #51b7e4;
$custom-light: #90ccec;
$custom-dark: #000000;

JSON

{
  "hex": "#51b7e4",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 228
  },
  "hsl": {
    "h": 198.367,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.7374,
    "c": 0.1141,
    "h": 230.1
  },
  "luminance": 0.41218
}

Semantic roles & 50–950 ramp

primary

#51B7E4

secondary

#E4BEAC

accent

#4D10D5

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B7E4

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

Preview Lab → · Contrast checker → · Palette generator →