#42B5CC#42B5CC

#42B5CC is a light, moderate cyan. Relative luminance 0.386; OKLCH L 71.8% C 0.106 H 213.6°. Best body text is #000000 at 8.71:1 contrast (WCAG AA passes).

Color values

HEX	#42B5CC
RGB	rgb(66, 181, 204)
HSL	hsl(190, 58%, 53%)
HSV	hsv(190, 68%, 80%)
CMYK	cmyk(67.6%, 11.3%, 0%, 20%)
CIE-LAB	lab(68.43, -24.77, -21.08)
CIE-LCH	lch(68.43, 32.53, 220.39°)
OKLab	oklab(71.81% -0.0884 -0.0586)
OKLCH	oklch(71.81% 0.106 213.6)
XYZ	xyz(29.6652, 38.5623, 62.9949)
Luminance	0.3857 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B5CC #CC5942

analogous

#42CC9E #42B5CC #4270CC

triadic

#42B5CC #CC42B5 #B5CC42

tetradic

#42B5CC #9E42CC #CC5942 #70CC42

square

#42B5CC #9E42CC #CC5942 #70CC42

split-complementary

#42B5CC #CC4270 #CC9E42

monochromatic

#1F6674 #2C90A4 #42B5CC #72C8D9 #A2DBE6

Accessibility & contrast

On white

2.41

#42B5CC on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.71

#42B5CC on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B5CC

8.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B5CC	#FFFFFF	#000000	##000000
##42B5CC	1.00	2.41	8.71	8.71
#FFFFFF	2.41	1.00	21.00	21.00
#000000	8.71	21.00	1.00	1.00
##000000	8.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A4AFCD

Deuteranopia (green-blind)

#90A1CC

Tritanopia (blue-blind)

#00BEBC

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #42b5cc;
/* rgb */ color: rgb(66, 181, 204);
/* oklch */ color: oklch(71.8% 0.106 213.6);

Tailwind

colors: {
  custom: {
    50: '#87cbdb',
    500: '#42b5cc',
    950: '#000000',
  },
}

SCSS

$custom: #42b5cc;
$custom-light: #87cbdb;
$custom-dark: #000000;

JSON

{
  "hex": "#42b5cc",
  "rgb": {
    "r": 66,
    "g": 181,
    "b": 204
  },
  "hsl": {
    "h": 190,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.71812,
    "c": 0.10607,
    "h": 213.6
  },
  "luminance": 0.38566
}

Semantic roles & 50–950 ramp

primary

#42B5CC

secondary

#D3A197

accent

#6147E1

background

#F9FCFD

surface

#F1F8FB

border

#CBD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #42B5CC

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

Preview Lab → · Contrast checker → · Palette generator →