#51B4E0#51B4E0

#51B4E0 is a light, moderate cyan. Relative luminance 0.398; OKLCH L 72.9% C 0.112 H 230.2°. Best body text is #000000 at 8.95:1 contrast (WCAG AA passes).

Color values

HEX	#51B4E0
RGB	rgb(81, 180, 224)
HSL	hsl(198, 70%, 60%)
HSV	hsv(198, 64%, 88%)
CMYK	cmyk(63.8%, 19.6%, 0%, 12.2%)
CIE-LAB	lab(69.31, -15.69, -30.67)
CIE-LCH	lch(69.31, 34.45, 242.90°)
OKLab	oklab(72.88% -0.0715 -0.0858)
OKLCH	oklch(72.88% 0.112 230.2)
XYZ	xyz(33.1639, 39.7702, 76.4352)
Luminance	0.3977 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4E0 #E07D51

analogous

#51E0C5 #51B4E0 #516CE0

triadic

#51B4E0 #E051B4 #B4E051

tetradic

#51B4E0 #C551E0 #E07D51 #6CE051

square

#51B4E0 #C551E0 #E07D51 #6CE051

split-complementary

#51B4E0 #E0516C #E0C551

monochromatic

#1C749B #259BCF #51B4E0 #85CAE9 #B9E1F3

Accessibility & contrast

On white

2.35

#51B4E0 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.95

#51B4E0 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4E0

8.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4E0	#FFFFFF	#000000	##000000
##51B4E0	1.00	2.35	8.95	8.95
#FFFFFF	2.35	1.00	21.00	21.00
#000000	8.95	21.00	1.00	1.00
##000000	8.95	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB1E2

Deuteranopia (green-blind)

#8AA3DF

Tritanopia (blue-blind)

#00C0C2

Achromatopsia (no color)

#A9A9A9

Design tokens & code

CSS

--color: #51b4e0;
/* rgb */ color: rgb(81, 180, 224);
/* oklch */ color: oklch(72.9% 0.112 230.2);

Tailwind

colors: {
  custom: {
    50: '#90cae9',
    500: '#51b4e0',
    950: '#000000',
  },
}

SCSS

$custom: #51b4e0;
$custom-light: #90cae9;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4e0",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 224
  },
  "hsl": {
    "h": 198.462,
    "s": 69.756,
    "l": 59.804
  },
  "oklch": {
    "l": 0.72876,
    "c": 0.11171,
    "h": 230.2
  },
  "luminance": 0.39774
}

Semantic roles & 50–950 ramp

primary

#51B4E0

secondary

#E2BCAB

accent

#723BED

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4E0

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

Preview Lab → · Contrast checker → · Palette generator →