#42B5CE#42B5CE

#42B5CE is a light, moderate cyan. Relative luminance 0.387; OKLCH L 71.9% C 0.107 H 215.0°. Best body text is #000000 at 8.73:1 contrast (WCAG AA passes).

Color values

HEX	#42B5CE
RGB	rgb(66, 181, 206)
HSL	hsl(191, 59%, 53%)
HSV	hsv(191, 68%, 81%)
CMYK	cmyk(68%, 12.1%, 0%, 19.2%)
CIE-LAB	lab(68.50, -24.16, -22.07)
CIE-LCH	lch(68.50, 32.72, 222.41°)
OKLab	oklab(71.89% -0.0876 -0.0614)
OKLCH	oklch(71.89% 0.107 215)
XYZ	xyz(29.9066, 38.6589, 64.2663)
Luminance	0.3866 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B5CE #CE5B42

analogous

#42CEA1 #42B5CE #426FCE

triadic

#42B5CE #CE42B5 #B5CE42

tetradic

#42B5CE #A142CE #CE5B42 #6FCE42

square

#42B5CE #A142CE #CE5B42 #6FCE42

split-complementary

#42B5CE #CE426F #CEA142

monochromatic

#1F6777 #2B91A7 #42B5CE #73C8DB #A3DBE7

Accessibility & contrast

On white

2.40

#42B5CE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.73

#42B5CE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B5CE

8.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B5CE	#FFFFFF	#000000	##000000
##42B5CE	1.00	2.40	8.73	8.73
#FFFFFF	2.40	1.00	21.00	21.00
#000000	8.73	21.00	1.00	1.00
##000000	8.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A3AFCF

Deuteranopia (green-blind)

#90A1CE

Tritanopia (blue-blind)

#00BEBD

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #42b5ce;
/* rgb */ color: rgb(66, 181, 206);
/* oklch */ color: oklch(71.9% 0.107 215.0);

Tailwind

colors: {
  custom: {
    50: '#87cbdd',
    500: '#42b5ce',
    950: '#000000',
  },
}

SCSS

$custom: #42b5ce;
$custom-light: #87cbdd;
$custom-dark: #000000;

JSON

{
  "hex": "#42b5ce",
  "rgb": {
    "r": 66,
    "g": 181,
    "b": 206
  },
  "hsl": {
    "h": 190.714,
    "s": 58.824,
    "l": 53.333
  },
  "oklch": {
    "l": 0.71892,
    "c": 0.10699,
    "h": 215
  },
  "luminance": 0.38662
}

Semantic roles & 50–950 ramp

primary

#42B5CE

secondary

#D4A398

accent

#6246E2

background

#F9FCFD

surface

#F1F8FB

border

#CBD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #42B5CE

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

Preview Lab → · Contrast checker → · Palette generator →