#42B4DF#42B4DF

#42B4DF is a light, moderate cyan. Relative luminance 0.391; OKLCH L 72.4% C 0.118 H 227.2°. Best body text is #000000 at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#42B4DF
RGB	rgb(66, 180, 223)
HSL	hsl(196, 71%, 57%)
HSV	hsv(196, 70%, 87%)
CMYK	cmyk(70.4%, 19.3%, 0%, 12.5%)
CIE-LAB	lab(68.84, -18.29, -30.87)
CIE-LCH	lch(68.84, 35.89, 239.36°)
OKLab	oklab(72.37% -0.0802 -0.0865)
OKLCH	oklch(72.37% 0.118 227.2)
XYZ	xyz(31.8819, 39.1249, 75.6693)
Luminance	0.3913 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B4DF #DF6D42

analogous

#42DFBC #42B4DF #4266DF

triadic

#42B4DF #DF42B4 #B4DF42

tetradic

#42B4DF #BC42DF #DF6D42 #66DF42

square

#42B4DF #BC42DF #DF6D42 #66DF42

split-complementary

#42B4DF #DF4266 #DFBC42

monochromatic

#186E8E #2196C3 #42B4DF #76C9E8 #ABDEF1

Accessibility & contrast

On white

2.38

#42B4DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.83

#42B4DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B4DF

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B4DF	#FFFFFF	#000000	##000000
##42B4DF	1.00	2.38	8.83	8.83
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.83	21.00	1.00	1.00
##000000	8.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB1E1

Deuteranopia (green-blind)

#88A1DE

Tritanopia (blue-blind)

#00C0C2

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #42b4df;
/* rgb */ color: rgb(66, 180, 223);
/* oklch */ color: oklch(72.4% 0.118 227.2);

Tailwind

colors: {
  custom: {
    50: '#89cae9',
    500: '#42b4df',
    950: '#000000',
  },
}

SCSS

$custom: #42b4df;
$custom-light: #89cae9;
$custom-dark: #000000;

JSON

{
  "hex": "#42b4df",
  "rgb": {
    "r": 66,
    "g": 180,
    "b": 223
  },
  "hsl": {
    "h": 196.433,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.72372,
    "c": 0.11793,
    "h": 227.2
  },
  "luminance": 0.39128
}

Semantic roles & 50–950 ramp

primary

#42B4DF

secondary

#DFB09E

accent

#6B3AEE

background

#F9FCFE

surface

#F1F8FC

border

#CBD1D5

text

#0D1316

muted

#7E8284

Preview Lab

Preview with #42B4DF

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

Preview Lab → · Contrast checker → · Palette generator →