#42B5DF#42B5DF

#42B5DF is a light, moderate cyan. Relative luminance 0.395; OKLCH L 72.6% C 0.118 H 226.4°. Best body text is #000000 at 8.91:1 contrast (WCAG AA passes).

Color values

HEX	#42B5DF
RGB	rgb(66, 181, 223)
HSL	hsl(196, 71%, 57%)
HSV	hsv(196, 70%, 87%)
CMYK	cmyk(70.4%, 18.8%, 0%, 12.5%)
CIE-LAB	lab(69.13, -18.81, -30.42)
CIE-LCH	lch(69.13, 35.77, 238.27°)
OKLab	oklab(72.61% -0.0811 -0.0852)
OKLCH	oklch(72.61% 0.118 226.4)
XYZ	xyz(32.0845, 39.5301, 75.7368)
Luminance	0.3953 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B5DF #DF6C42

analogous

#42DFBB #42B5DF #4267DF

triadic

#42B5DF #DF42B5 #B5DF42

tetradic

#42B5DF #BB42DF #DF6C42 #67DF42

square

#42B5DF #BB42DF #DF6C42 #67DF42

split-complementary

#42B5DF #DF4267 #DFBB42

monochromatic

#186F8E #2198C3 #42B5DF #76C9E8 #ABDEF1

Accessibility & contrast

On white

2.36

#42B5DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.91

#42B5DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B5DF

8.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B5DF	#FFFFFF	#000000	##000000
##42B5DF	1.00	2.36	8.91	8.91
#FFFFFF	2.36	1.00	21.00	21.00
#000000	8.91	21.00	1.00	1.00
##000000	8.91	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9EB2E1

Deuteranopia (green-blind)

#89A2DE

Tritanopia (blue-blind)

#00C1C3

Achromatopsia (no color)

#A9A9A9

Design tokens & code

CSS

--color: #42b5df;
/* rgb */ color: rgb(66, 181, 223);
/* oklch */ color: oklch(72.6% 0.118 226.4);

Tailwind

colors: {
  custom: {
    50: '#8acbe9',
    500: '#42b5df',
    950: '#000000',
  },
}

SCSS

$custom: #42b5df;
$custom-light: #8acbe9;
$custom-dark: #000000;

JSON

{
  "hex": "#42b5df",
  "rgb": {
    "r": 66,
    "g": 181,
    "b": 223
  },
  "hsl": {
    "h": 196.051,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.72606,
    "c": 0.11766,
    "h": 226.4
  },
  "luminance": 0.39534
}

Semantic roles & 50–950 ramp

primary

#42B5DF

secondary

#DFAF9E

accent

#6A3AEE

background

#F9FCFE

surface

#F1F8FC

border

#CBD1D5

text

#0D1316

muted

#7E8284

Preview Lab

Preview with #42B5DF

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

Preview Lab → · Contrast checker → · Palette generator →