#42B4CB#42B4CB

#42B4CB is a light, moderate cyan. Relative luminance 0.381; OKLCH L 71.5% C 0.105 H 213.7°. Best body text is #000000 at 8.62:1 contrast (WCAG AA passes).

Color values

HEX	#42B4CB
RGB	rgb(66, 180, 203)
HSL	hsl(190, 57%, 53%)
HSV	hsv(190, 67%, 80%)
CMYK	cmyk(67.5%, 11.3%, 0%, 20.4%)
CIE-LAB	lab(68.10, -24.58, -21.03)
CIE-LCH	lch(68.10, 32.35, 220.56°)
OKLab	oklab(71.53% -0.0878 -0.0585)
OKLCH	oklch(71.53% 0.105 213.7)
XYZ	xyz(29.3430, 38.1093, 62.2977)
Luminance	0.3811 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B4CB #CB5942

analogous

#42CB9D #42B4CB #426FCB

triadic

#42B4CB #CB42B4 #B4CB42

tetradic

#42B4CB #9D42CB #CB5942 #6FCB42

square

#42B4CB #9D42CB #CB5942 #6FCB42

split-complementary

#42B4CB #CB426F #CB9D42

monochromatic

#206573 #2D8FA3 #42B4CB #72C7D8 #A2DAE5

Accessibility & contrast

On white

2.44

#42B4CB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.62

#42B4CB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B4CB

8.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B4CB	#FFFFFF	#000000	##000000
##42B4CB	1.00	2.44	8.62	8.62
#FFFFFF	2.44	1.00	21.00	21.00
#000000	8.62	21.00	1.00	1.00
##000000	8.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A3AECC

Deuteranopia (green-blind)

#8FA0CB

Tritanopia (blue-blind)

#00BDBB

Achromatopsia (no color)

#A6A6A6

Design tokens & code

CSS

--color: #42b4cb;
/* rgb */ color: rgb(66, 180, 203);
/* oklch */ color: oklch(71.5% 0.105 213.7);

Tailwind

colors: {
  custom: {
    50: '#87cada',
    500: '#42b4cb',
    950: '#000000',
  },
}

SCSS

$custom: #42b4cb;
$custom-light: #87cada;
$custom-dark: #000000;

JSON

{
  "hex": "#42b4cb",
  "rgb": {
    "r": 66,
    "g": 180,
    "b": 203
  },
  "hsl": {
    "h": 190.073,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.71533,
    "c": 0.10548,
    "h": 213.7
  },
  "luminance": 0.38113
}

Semantic roles & 50–950 ramp

primary

#42B4CB

secondary

#D2A197

accent

#6148E0

background

#F8FCFD

surface

#F0F8FA

border

#CBD1D3

text

#0D1315

muted

#7D8283

Preview Lab

Preview with #42B4CB

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

Preview Lab → · Contrast checker → · Palette generator →