#4273EA#4273EA

#4273EA is a mid, vivid blue. Relative luminance 0.194; OKLCH L 58.7% C 0.188 H 264.5°. Best body text is #000000 at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#4273EA
RGB	rgb(66, 115, 234)
HSL	hsl(223, 80%, 59%)
HSV	hsv(223, 72%, 92%)
CMYK	cmyk(71.8%, 50.9%, 0%, 8.2%)
CIE-LAB	lab(51.10, 23.35, -65.03)
CIE-LCH	lch(51.10, 69.09, 289.75°)
OKLab	oklab(58.67% -0.0181 -0.187)
OKLCH	oklch(58.67% 0.188 264.5)
XYZ	xyz(23.2235, 19.3578, 80.3384)
Luminance	0.1936 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273EA #EAB942

analogous

#42C7EA #4273EA #6542EA

triadic

#4273EA #EA4273 #73EA42

tetradic

#4273EA #EA42C7 #EAB942 #42EA65

square

#4273EA #EA42C7 #EAB942 #42EA65

split-complementary

#4273EA #EA6542 #C7EA42

monochromatic

#123BA0 #1850D7 #4273EA #799CF0 #B0C5F6

Accessibility & contrast

On white

4.31

#4273EA on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.87

#4273EA on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4273EA

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273EA	#FFFFFF	#000000	##000000
##4273EA	1.00	4.31	4.87	4.87
#FFFFFF	4.31	1.00	21.00	21.00
#000000	4.87	21.00	1.00	1.00
##000000	4.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2782EE

Deuteranopia (green-blind)

#0072E8

Tritanopia (blue-blind)

#008FA4

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #4273ea;
/* rgb */ color: rgb(66, 115, 234);
/* oklch */ color: oklch(58.7% 0.188 264.5);

Tailwind

colors: {
  custom: {
    50: '#8b9af1',
    500: '#4273ea',
    950: '#000000',
  },
}

SCSS

$custom: #4273ea;
$custom-light: #8b9af1;
$custom-dark: #000000;

JSON

{
  "hex": "#4273ea",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 234
  },
  "hsl": {
    "h": 222.5,
    "s": 80,
    "l": 58.824
  },
  "oklch": {
    "l": 0.58671,
    "c": 0.18788,
    "h": 264.5
  },
  "luminance": 0.1936
}

Semantic roles & 50–950 ramp

primary

#4273EA

secondary

#E5D2A3

accent

#BD31F6

background

#F9F9FE

surface

#F2F2FD

border

#CCCCD5

text

#0D0E17

muted

#7E7E85

Preview Lab

Preview with #4273EA

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

Preview Lab → · Contrast checker → · Palette generator →