#42D5F3#42D5F3

#42D5F3 is a light, vivid cyan. Relative luminance 0.552; OKLCH L 80.9% C 0.127 H 214.6°. Best body text is #000000 at 12.04:1 contrast (WCAG AA passes).

Color values

HEX	#42D5F3
RGB	rgb(66, 213, 243)
HSL	hsl(190, 88%, 61%)
HSV	hsv(190, 73%, 95%)
CMYK	cmyk(72.8%, 12.3%, 0%, 4.7%)
CIE-LAB	lab(79.16, -28.71, -25.83)
CIE-LCH	lch(79.16, 38.62, 221.97°)
OKLab	oklab(80.9% -0.1043 -0.072)
OKLCH	oklch(80.9% 0.127 214.6)
XYZ	xyz(42.2118, 55.2128, 93.2091)
Luminance	0.5522 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42D5F3 #F36042

analogous

#42F3B8 #42D5F3 #427DF3

triadic

#42D5F3 #F342D5 #D5F342

tetradic

#42D5F3 #B842F3 #F36042 #7DF342

square

#42D5F3 #B842F3 #F36042 #7DF342

split-complementary

#42D5F3 #F3427D #F3B842

monochromatic

#0B94AF #0FC4E9 #42D5F3 #7CE2F7 #B5EFFA

Accessibility & contrast

On white

1.74

#42D5F3 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

12.04

#42D5F3 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42D5F3

12.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42D5F3	#FFFFFF	#000000	##000000
##42D5F3	1.00	1.74	12.04	12.04
#FFFFFF	1.74	1.00	21.00	21.00
#000000	12.04	21.00	1.00	1.00
##000000	12.04	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#C0CEF5

Deuteranopia (green-blind)

#A7BCF3

Tritanopia (blue-blind)

#00E0DE

Achromatopsia (no color)

#C4C4C4

Design tokens & code

CSS

--color: #42d5f3;
/* rgb */ color: rgb(66, 213, 243);
/* oklch */ color: oklch(80.9% 0.127 214.6);

Tailwind

colors: {
  custom: {
    50: '#8fe2f7',
    500: '#42d5f3',
    950: '#000000',
  },
}

SCSS

$custom: #42d5f3;
$custom-light: #8fe2f7;
$custom-dark: #000000;

JSON

{
  "hex": "#42d5f3",
  "rgb": {
    "r": 66,
    "g": 213,
    "b": 243
  },
  "hsl": {
    "h": 190.169,
    "s": 88.06,
    "l": 60.588
  },
  "oklch": {
    "l": 0.809,
    "c": 0.12678,
    "h": 214.6
  },
  "luminance": 0.55218
}

Semantic roles & 50–950 ramp

primary

#42D5F3

secondary

#B0402A

accent

#2701E5

background

#FCFEFF

surface

#F5FCFE

border

#CFD5D6

text

#0E1517

muted

#7F8485

Preview Lab

Preview with #42D5F3

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

Preview Lab → · Contrast checker → · Palette generator →