#51ACE4#51ACE4

#51ACE4 is a light, moderate cyan. Relative luminance 0.369; OKLCH L 71.2% C 0.119 H 238.6°. Best body text is #000000 at 8.37:1 contrast (WCAG AA passes).

Color values

HEX	#51ACE4
RGB	rgb(81, 172, 228)
HSL	hsl(203, 73%, 61%)
HSV	hsv(203, 64%, 89%)
CMYK	cmyk(64.5%, 24.6%, 0%, 10.6%)
CIE-LAB	lab(67.17, -10.12, -36.18)
CIE-LCH	lch(67.17, 37.56, 254.37°)
OKLab	oklab(71.23% -0.062 -0.1017)
OKLCH	oklch(71.23% 0.119 238.6)
XYZ	xyz(32.1441, 36.8525, 78.8030)
Luminance	0.3686 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51ACE4 #E48951

analogous

#51E4D2 #51ACE4 #5162E4

triadic

#51ACE4 #E451AC #ACE451

tetradic

#51ACE4 #D251E4 #E48951 #62E451

square

#51ACE4 #D251E4 #E48951 #62E451

split-complementary

#51ACE4 #E45162 #E4D251

monochromatic

#196EA2 #2191D7 #51ACE4 #86C5EC #BBDFF4

Accessibility & contrast

On white

2.51

#51ACE4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.37

#51ACE4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51ACE4

8.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51ACE4	#FFFFFF	#000000	##000000
##51ACE4	1.00	2.51	8.37	8.37
#FFFFFF	2.51	1.00	21.00	21.00
#000000	8.37	21.00	1.00	1.00
##000000	8.37	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#92ACE7

Deuteranopia (green-blind)

#7E9DE3

Tritanopia (blue-blind)

#00BABF

Achromatopsia (no color)

#A3A3A3

Design tokens & code

CSS

--color: #51ace4;
/* rgb */ color: rgb(81, 172, 228);
/* oklch */ color: oklch(71.2% 0.119 238.6);

Tailwind

colors: {
  custom: {
    50: '#90c4ec',
    500: '#51ace4',
    950: '#000000',
  },
}

SCSS

$custom: #51ace4;
$custom-light: #90c4ec;
$custom-dark: #000000;

JSON

{
  "hex": "#51ace4",
  "rgb": {
    "r": 81,
    "g": 172,
    "b": 228
  },
  "hsl": {
    "h": 202.857,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.71228,
    "c": 0.11909,
    "h": 238.6
  },
  "luminance": 0.36856
}

Semantic roles & 50–950 ramp

primary

#51ACE4

secondary

#E4C2AC

accent

#5B10D5

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1216

muted

#7E8184

Preview Lab

Preview with #51ACE4

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

Preview Lab → · Contrast checker → · Palette generator →