#51BBE4#51BBE4

#51BBE4 is a light, moderate cyan. Relative luminance 0.429; OKLCH L 74.7% C 0.113 H 226.9°. Best body text is #000000 at 9.58:1 contrast (WCAG AA passes).

Color values

HEX	#51BBE4
RGB	rgb(81, 187, 228)
HSL	hsl(197, 73%, 61%)
HSV	hsv(197, 64%, 89%)
CMYK	cmyk(64.5%, 18%, 0%, 10.6%)
CIE-LAB	lab(71.48, -18.13, -29.50)
CIE-LCH	lch(71.48, 34.63, 238.43°)
OKLab	oklab(74.66% -0.0773 -0.0824)
OKLCH	oklch(74.66% 0.113 226.9)
XYZ	xyz(35.1617, 42.8877, 79.8088)
Luminance	0.4289 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BBE4 #E47A51

analogous

#51E4C4 #51BBE4 #5171E4

triadic

#51BBE4 #E451BB #BBE451

tetradic

#51BBE4 #C451E4 #E47A51 #71E451

square

#51BBE4 #C451E4 #E47A51 #71E451

split-complementary

#51BBE4 #E45171 #E4C451

monochromatic

#197BA2 #21A4D7 #51BBE4 #86D0EC #BBE4F4

Accessibility & contrast

On white

2.19

#51BBE4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.58

#51BBE4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BBE4

9.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BBE4	#FFFFFF	#000000	##000000
##51BBE4	1.00	2.19	9.58	9.58
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.58	21.00	1.00	1.00
##000000	9.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A5B8E6

Deuteranopia (green-blind)

#91A8E4

Tritanopia (blue-blind)

#00C7C8

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #51bbe4;
/* rgb */ color: rgb(81, 187, 228);
/* oklch */ color: oklch(74.7% 0.113 226.9);

Tailwind

colors: {
  custom: {
    50: '#91cfec',
    500: '#51bbe4',
    950: '#000000',
  },
}

SCSS

$custom: #51bbe4;
$custom-light: #91cfec;
$custom-dark: #000000;

JSON

{
  "hex": "#51bbe4",
  "rgb": {
    "r": 81,
    "g": 187,
    "b": 228
  },
  "hsl": {
    "h": 196.735,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.74661,
    "c": 0.11298,
    "h": 226.9
  },
  "luminance": 0.42891
}

Semantic roles & 50–950 ramp

primary

#51BBE4

secondary

#E4BCAC

accent

#4710D5

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51BBE4

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

Preview Lab → · Contrast checker → · Palette generator →