#42B3DF#42B3DF

#42B3DF is a light, moderate cyan. Relative luminance 0.387; OKLCH L 72.1% C 0.118 H 228.0°. Best body text is #000000 at 8.75:1 contrast (WCAG AA passes).

Color values

HEX	#42B3DF
RGB	rgb(66, 179, 223)
HSL	hsl(197, 71%, 57%)
HSV	hsv(197, 70%, 87%)
CMYK	cmyk(70.4%, 19.7%, 0%, 12.5%)
CIE-LAB	lab(68.55, -17.76, -31.33)
CIE-LCH	lch(68.55, 36.01, 240.44°)
OKLab	oklab(72.14% -0.0792 -0.0878)
OKLCH	oklch(72.14% 0.118 228)
XYZ	xyz(31.6808, 38.7226, 75.6023)
Luminance	0.3873 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B3DF #DF6E42

analogous

#42DFBC #42B3DF #4265DF

triadic

#42B3DF #DF42B3 #B3DF42

tetradic

#42B3DF #BC42DF #DF6E42 #65DF42

square

#42B3DF #BC42DF #DF6E42 #65DF42

split-complementary

#42B3DF #DF4265 #DFBC42

monochromatic

#186D8E #2195C3 #42B3DF #76C8E8 #ABDDF1

Accessibility & contrast

On white

2.40

#42B3DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.75

#42B3DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B3DF

8.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B3DF	#FFFFFF	#000000	##000000
##42B3DF	1.00	2.40	8.75	8.75
#FFFFFF	2.40	1.00	21.00	21.00
#000000	8.75	21.00	1.00	1.00
##000000	8.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB0E1

Deuteranopia (green-blind)

#86A0DE

Tritanopia (blue-blind)

#00C0C1

Achromatopsia (no color)

#A7A7A7

Design tokens & code

CSS

--color: #42b3df;
/* rgb */ color: rgb(66, 179, 223);
/* oklch */ color: oklch(72.1% 0.118 228.0);

Tailwind

colors: {
  custom: {
    50: '#89c9e9',
    500: '#42b3df',
    950: '#000000',
  },
}

SCSS

$custom: #42b3df;
$custom-light: #89c9e9;
$custom-dark: #000000;

JSON

{
  "hex": "#42b3df",
  "rgb": {
    "r": 66,
    "g": 179,
    "b": 223
  },
  "hsl": {
    "h": 196.815,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.72139,
    "c": 0.11824,
    "h": 228
  },
  "luminance": 0.38726
}

Semantic roles & 50–950 ramp

primary

#42B3DF

secondary

#DFB09E

accent

#6C3AEE

background

#F9FCFE

surface

#F1F8FC

border

#CBD1D5

text

#0D1316

muted

#7E8284

Preview Lab

Preview with #42B3DF

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

Preview Lab → · Contrast checker → · Palette generator →