#42B4E0#42B4E0

#42B4E0 is a light, moderate cyan. Relative luminance 0.392; OKLCH L 72.4% C 0.119 H 227.8°. Best body text is #000000 at 8.84:1 contrast (WCAG AA passes).

Color values

HEX	#42B4E0
RGB	rgb(66, 180, 224)
HSL	hsl(197, 72%, 57%)
HSV	hsv(197, 71%, 88%)
CMYK	cmyk(70.5%, 19.6%, 0%, 12.2%)
CIE-LAB	lab(68.88, -17.97, -31.36)
CIE-LCH	lch(68.88, 36.14, 240.19°)
OKLab	oklab(72.42% -0.0798 -0.0879)
OKLCH	oklch(72.42% 0.119 227.8)
XYZ	xyz(32.0171, 39.1789, 76.3815)
Luminance	0.3918 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B4E0 #E06E42

analogous

#42E0BD #42B4E0 #4265E0

triadic

#42B4E0 #E042B4 #B4E042

tetradic

#42B4E0 #BD42E0 #E06E42 #65E042

square

#42B4E0 #BD42E0 #E06E42 #65E042

split-complementary

#42B4E0 #E04265 #E0BD42

monochromatic

#186E90 #2097C5 #42B4E0 #77C9E9 #ABDEF1

Accessibility & contrast

On white

2.38

#42B4E0 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.84

#42B4E0 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B4E0

8.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B4E0	#FFFFFF	#000000	##000000
##42B4E0	1.00	2.38	8.84	8.84
#FFFFFF	2.38	1.00	21.00	21.00
#000000	8.84	21.00	1.00	1.00
##000000	8.84	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9DB1E2

Deuteranopia (green-blind)

#87A1DF

Tritanopia (blue-blind)

#00C1C2

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #42b4e0;
/* rgb */ color: rgb(66, 180, 224);
/* oklch */ color: oklch(72.4% 0.119 227.8);

Tailwind

colors: {
  custom: {
    50: '#8acae9',
    500: '#42b4e0',
    950: '#000000',
  },
}

SCSS

$custom: #42b4e0;
$custom-light: #8acae9;
$custom-dark: #000000;

JSON

{
  "hex": "#42b4e0",
  "rgb": {
    "r": 66,
    "g": 180,
    "b": 224
  },
  "hsl": {
    "h": 196.709,
    "s": 71.818,
    "l": 56.863
  },
  "oklch": {
    "l": 0.72417,
    "c": 0.11872,
    "h": 227.8
  },
  "luminance": 0.39183
}

Semantic roles & 50–950 ramp

primary

#42B4E0

secondary

#DFB19F

accent

#6C39EF

background

#F9FCFE

surface

#F1F8FD

border

#CBD1D5

text

#0D1316

muted

#7E8284

Preview Lab

Preview with #42B4E0

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

Preview Lab → · Contrast checker → · Palette generator →