#428EFF#428EFF

#428EFF is a light, vivid blue. Relative luminance 0.277; OKLCH L 65.6% C 0.184 H 258.4°. Best body text is #000000 at 6.54:1 contrast (WCAG AA passes).

Color values

HEX	#428EFF
RGB	rgb(66, 142, 255)
HSL	hsl(216, 100%, 63%)
HSV	hsv(216, 74%, 100%)
CMYK	cmyk(74.1%, 44.3%, 0%, 0%)
CIE-LAB	lab(59.64, 14.28, -62.93)
CIE-LCH	lch(59.64, 64.53, 282.78°)
OKLab	oklab(65.63% -0.0369 -0.1804)
OKLCH	oklch(65.63% 0.184 258.4)
XYZ	xyz(29.9632, 27.7209, 98.3599)
Luminance	0.2772 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428EFF #FFB342

analogous

#42ECFF #428EFF #5442FF

triadic

#428EFF #FF428E #8EFF42

tetradic

#428EFF #FF42EC #FFB342 #42FF54

square

#428EFF #FF42EC #FFB342 #42FF54

split-complementary

#428EFF #FF5442 #ECFF42

monochromatic

#0050C7 #0569FF #428EFF #7FB3FF #BCD7FF

Accessibility & contrast

On white

3.21

#428EFF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.54

#428EFF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428EFF

6.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428EFF	#FFFFFF	#000000	##000000
##428EFF	1.00	3.21	6.54	6.54
#FFFFFF	3.21	1.00	21.00	21.00
#000000	6.54	21.00	1.00	1.00
##000000	6.54	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5499FF

Deuteranopia (green-blind)

#2C88FD

Tritanopia (blue-blind)

#00A9BA

Achromatopsia (no color)

#909090

Design tokens & code

CSS

--color: #428eff;
/* rgb */ color: rgb(66, 142, 255);
/* oklch */ color: oklch(65.6% 0.184 258.4);

Tailwind

colors: {
  custom: {
    50: '#8eaeff',
    500: '#428eff',
    950: '#000000',
  },
}

SCSS

$custom: #428eff;
$custom-light: #8eaeff;
$custom-dark: #000000;

JSON

{
  "hex": "#428eff",
  "rgb": {
    "r": 66,
    "g": 142,
    "b": 255
  },
  "hsl": {
    "h": 215.873,
    "s": 100,
    "l": 62.941
  },
  "oklch": {
    "l": 0.6563,
    "c": 0.1841,
    "h": 258.4
  },
  "luminance": 0.27724
}

Semantic roles & 50–950 ramp

primary

#428EFF

secondary

#F0D5AC

accent

#8900E6

background

#F9FAFF

surface

#F2F4FF

border

#CCCED7

text

#0E1018

muted

#7E7F86

Preview Lab

Preview with #428EFF

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

Preview Lab → · Contrast checker → · Palette generator →