#42B5CF#42B5CF

#42B5CF is a light, moderate cyan. Relative luminance 0.387; OKLCH L 71.9% C 0.107 H 215.8°. Best body text is #000000 at 8.74:1 contrast (WCAG AA passes).

Color values

HEX	#42B5CF
RGB	rgb(66, 181, 207)
HSL	hsl(191, 59%, 54%)
HSV	hsv(191, 68%, 81%)
CMYK	cmyk(68.1%, 12.6%, 0%, 18.8%)
CIE-LAB	lab(68.54, -23.85, -22.57)
CIE-LCH	lch(68.54, 32.84, 223.41°)
OKLab	oklab(71.93% -0.0872 -0.0628)
OKLCH	oklch(71.93% 0.107 215.8)
XYZ	xyz(30.0284, 38.7076, 64.9081)
Luminance	0.3871 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B5CF #CF5C42

analogous

#42CFA2 #42B5CF #426ECF

triadic

#42B5CF #CF42B5 #B5CF42

tetradic

#42B5CF #A242CF #CF5C42 #6ECF42

square

#42B5CF #A242CF #CF5C42 #6ECF42

split-complementary

#42B5CF #CF426E #CFA242

monochromatic

#1F6878 #2B92A9 #42B5CF #73C8DB #A4DBE8

Accessibility & contrast

On white

2.40

#42B5CF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.74

#42B5CF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B5CF

8.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B5CF	#FFFFFF	#000000	##000000
##42B5CF	1.00	2.40	8.74	8.74
#FFFFFF	2.40	1.00	21.00	21.00
#000000	8.74	21.00	1.00	1.00
##000000	8.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A3B0D0

Deuteranopia (green-blind)

#8FA1CF

Tritanopia (blue-blind)

#00BEBD

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #42b5cf;
/* rgb */ color: rgb(66, 181, 207);
/* oklch */ color: oklch(71.9% 0.107 215.8);

Tailwind

colors: {
  custom: {
    50: '#88cbdd',
    500: '#42b5cf',
    950: '#000000',
  },
}

SCSS

$custom: #42b5cf;
$custom-light: #88cbdd;
$custom-dark: #000000;

JSON

{
  "hex": "#42b5cf",
  "rgb": {
    "r": 66,
    "g": 181,
    "b": 207
  },
  "hsl": {
    "h": 191.064,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.71932,
    "c": 0.10748,
    "h": 215.8
  },
  "luminance": 0.38711
}

Semantic roles & 50–950 ramp

primary

#42B5CF

secondary

#D5A398

accent

#6245E3

background

#F9FCFD

surface

#F1F8FB

border

#CBD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #42B5CF

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

Preview Lab → · Contrast checker → · Palette generator →