#42B5D5#42B5D5

#42B5D5 is a light, moderate cyan. Relative luminance 0.390; OKLCH L 72.2% C 0.111 H 220.0°. Best body text is #000000 at 8.80:1 contrast (WCAG AA passes).

Color values

HEX	#42B5D5
RGB	rgb(66, 181, 213)
HSL	hsl(193, 64%, 55%)
HSV	hsv(193, 69%, 84%)
CMYK	cmyk(69%, 15%, 0%, 16.5%)
CIE-LAB	lab(68.76, -21.99, -25.53)
CIE-LCH	lch(68.76, 33.69, 229.26°)
OKLab	oklab(72.18% -0.0849 -0.0712)
OKLCH	oklch(72.18% 0.111 220)
XYZ	xyz(30.7759, 39.0066, 68.8449)
Luminance	0.3901 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B5D5 #D56242

analogous

#42D5AB #42B5D5 #426CD5

triadic

#42B5D5 #D542B5 #B5D542

tetradic

#42B5D5 #AB42D5 #D56242 #6CD542

square

#42B5D5 #AB42D5 #D56242 #6CD542

split-complementary

#42B5D5 #D5426C #D5AB42

monochromatic

#1C6A80 #2894B2 #42B5D5 #74C9E0 #A6DCEB

Accessibility & contrast

On white

2.39

#42B5D5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.80

#42B5D5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B5D5

8.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B5D5	#FFFFFF	#000000	##000000
##42B5D5	1.00	2.39	8.80	8.80
#FFFFFF	2.39	1.00	21.00	21.00
#000000	8.80	21.00	1.00	1.00
##000000	8.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A1B0D7

Deuteranopia (green-blind)

#8DA1D5

Tritanopia (blue-blind)

#00BFBF

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #42b5d5;
/* rgb */ color: rgb(66, 181, 213);
/* oklch */ color: oklch(72.2% 0.111 220.0);

Tailwind

colors: {
  custom: {
    50: '#88cbe2',
    500: '#42b5d5',
    950: '#000000',
  },
}

SCSS

$custom: #42b5d5;
$custom-light: #88cbe2;
$custom-dark: #000000;

JSON

{
  "hex": "#42b5d5",
  "rgb": {
    "r": 66,
    "g": 181,
    "b": 213
  },
  "hsl": {
    "h": 193.061,
    "s": 63.636,
    "l": 54.706
  },
  "oklch": {
    "l": 0.72179,
    "c": 0.11081,
    "h": 220
  },
  "luminance": 0.3901
}

Semantic roles & 50–950 ramp

primary

#42B5D5

secondary

#D8A89A

accent

#6541E7

background

#F9FCFD

surface

#F1F8FB

border

#CBD1D4

text

#0D1315

muted

#7E8283

Preview Lab

Preview with #42B5D5

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

Preview Lab → · Contrast checker → · Palette generator →