#42B4E1#42B4E1

#42B4E1 is a light, moderate cyan. Relative luminance 0.392; OKLCH L 72.5% C 0.120 H 228.3°. Best body text is #000000 at 8.85:1 contrast (WCAG AA passes).

Color values

HEX	#42B4E1
RGB	rgb(66, 180, 225)
HSL	hsl(197, 73%, 57%)
HSV	hsv(197, 71%, 88%)
CMYK	cmyk(70.7%, 20%, 0%, 11.8%)
CIE-LAB	lab(68.92, -17.64, -31.85)
CIE-LCH	lch(68.92, 36.41, 241.01°)
OKLab	oklab(72.46% -0.0794 -0.0893)
OKLCH	oklch(72.46% 0.12 228.3)
XYZ	xyz(32.1531, 39.2333, 77.0978)
Luminance	0.3924 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42B4E1 #E16F42

analogous

#42E1BF #42B4E1 #4265E1

triadic

#42B4E1 #E142B4 #B4E142

tetradic

#42B4E1 #BF42E1 #E16F42 #65E142

square

#42B4E1 #BF42E1 #E16F42 #65E142

split-complementary

#42B4E1 #E14265 #E1BF42

monochromatic

#176F92 #1F97C6 #42B4E1 #77C9E9 #ACDEF2

Accessibility & contrast

On white

2.37

#42B4E1 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.85

#42B4E1 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42B4E1

8.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42B4E1	#FFFFFF	#000000	##000000
##42B4E1	1.00	2.37	8.85	8.85
#FFFFFF	2.37	1.00	21.00	21.00
#000000	8.85	21.00	1.00	1.00
##000000	8.85	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CB1E3

Deuteranopia (green-blind)

#87A1E0

Tritanopia (blue-blind)

#00C1C3

Achromatopsia (no color)

#A8A8A8

Design tokens & code

CSS

--color: #42b4e1;
/* rgb */ color: rgb(66, 180, 225);
/* oklch */ color: oklch(72.5% 0.120 228.3);

Tailwind

colors: {
  custom: {
    50: '#8acaea',
    500: '#42b4e1',
    950: '#000000',
  },
}

SCSS

$custom: #42b4e1;
$custom-light: #8acaea;
$custom-dark: #000000;

JSON

{
  "hex": "#42b4e1",
  "rgb": {
    "r": 66,
    "g": 180,
    "b": 225
  },
  "hsl": {
    "h": 196.981,
    "s": 72.603,
    "l": 57.059
  },
  "oklch": {
    "l": 0.72461,
    "c": 0.11951,
    "h": 228.3
  },
  "luminance": 0.39237
}

Semantic roles & 50–950 ramp

primary

#42B4E1

secondary

#E0B19F

accent

#6C38EF

background

#F9FCFE

surface

#F1F8FD

border

#CBD1D5

text

#0D1316

muted

#7E8284

Preview Lab

Preview with #42B4E1

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

Preview Lab → · Contrast checker → · Palette generator →