#428AE3#428AE3

#428AE3 is a light, vivid cyan. Relative luminance 0.249; OKLCH L 63.0% C 0.153 H 255.2°. Best body text is #000000 at 5.98:1 contrast (WCAG AA passes).

Color values

HEX	#428AE3
RGB	rgb(66, 138, 227)
HSL	hsl(213, 74%, 57%)
HSV	hsv(213, 71%, 89%)
CMYK	cmyk(70.9%, 39.2%, 0%, 11%)
CIE-LAB	lab(56.96, 6.72, -51.73)
CIE-LCH	lch(56.96, 52.16, 277.40°)
OKLab	oklab(63.04% -0.039 -0.1475)
OKLCH	oklch(63.04% 0.153 255.2)
XYZ	xyz(25.1953, 24.8785, 76.1323)
Luminance	0.2488 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428AE3 #E39B42

analogous

#42DAE3 #428AE3 #4B42E3

triadic

#428AE3 #E3428A #8AE342

tetradic

#428AE3 #E342DA #E39B42 #42E34B

square

#428AE3 #E342DA #E39B42 #42E34B

split-complementary

#428AE3 #E34B42 #DAE342

monochromatic

#164F95 #1E6BCA #428AE3 #77ABEB #ADCCF3

Accessibility & contrast

On white

3.51

#428AE3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.98

#428AE3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428AE3

5.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428AE3	#FFFFFF	#000000	##000000
##428AE3	1.00	3.51	5.98	5.98
#FFFFFF	3.51	1.00	21.00	21.00
#000000	5.98	21.00	1.00	1.00
##000000	5.98	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6191E7

Deuteranopia (green-blind)

#4782E1

Tritanopia (blue-blind)

#009FAB

Achromatopsia (no color)

#898989

Design tokens & code

CSS

--color: #428ae3;
/* rgb */ color: rgb(66, 138, 227);
/* oklch */ color: oklch(63.0% 0.153 255.2);

Tailwind

colors: {
  custom: {
    50: '#89abec',
    500: '#428ae3',
    950: '#000000',
  },
}

SCSS

$custom: #428ae3;
$custom-light: #89abec;
$custom-dark: #000000;

JSON

{
  "hex": "#428ae3",
  "rgb": {
    "r": 66,
    "g": 138,
    "b": 227
  },
  "hsl": {
    "h": 213.168,
    "s": 74.194,
    "l": 57.451
  },
  "oklch": {
    "l": 0.63042,
    "c": 0.15258,
    "h": 255.2
  },
  "luminance": 0.24881
}

Semantic roles & 50–950 ramp

primary

#428AE3

secondary

#E1C4A0

accent

#9E37F1

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #428AE3

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

Preview Lab → · Contrast checker → · Palette generator →