#4273CB#4273CB

#4273CB is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.6% C 0.146 H 261.1°. Best body text is #FFFFFF at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#4273CB
RGB	rgb(66, 115, 203)
HSL	hsl(219, 57%, 53%)
HSV	hsv(219, 67%, 80%)
CMYK	cmyk(67.5%, 43.3%, 0%, 20.4%)
CIE-LAB	lab(49.17, 12.25, -50.61)
CIE-LCH	lch(49.17, 52.07, 283.60°)
OKLab	oklab(56.57% -0.0226 -0.1446)
OKLCH	oklch(56.57% 0.146 261.1)
XYZ	xyz(19.1532, 17.7296, 58.9011)
Luminance	0.1773 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273CB #CB9A42

analogous

#42B7CB #4273CB #5542CB

triadic

#4273CB #CB4273 #73CB42

tetradic

#4273CB #CB42B7 #CB9A42 #42CB55

square

#4273CB #CB42B7 #CB9A42 #42CB55

split-complementary

#4273CB #CB5542 #B7CB42

monochromatic

#203D73 #2D57A3 #4273CB #7297D8 #A2BAE5

Accessibility & contrast

On white

4.62

#4273CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.55

#4273CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #4273CB

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273CB	#FFFFFF	#000000	##FFFFFF
##4273CB	1.00	4.62	4.55	4.62
#FFFFFF	4.62	1.00	21.00	1.00
#000000	4.55	21.00	1.00	21.00
##FFFFFF	4.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#497CCE

Deuteranopia (green-blind)

#326FC9

Tritanopia (blue-blind)

#008795

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #4273cb;
/* rgb */ color: rgb(66, 115, 203);
/* oklch */ color: oklch(56.6% 0.146 261.1);

Tailwind

colors: {
  custom: {
    50: '#859adb',
    500: '#4273cb',
    950: '#000000',
  },
}

SCSS

$custom: #4273cb;
$custom-light: #859adb;
$custom-dark: #000000;

JSON

{
  "hex": "#4273cb",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 203
  },
  "hsl": {
    "h": 218.54,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.56567,
    "c": 0.14632,
    "h": 261.1
  },
  "luminance": 0.17732
}

Semantic roles & 50–950 ramp

primary

#4273CB

secondary

#D2BD97

accent

#AA48E0

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #4273CB

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

Preview Lab → · Contrast checker → · Palette generator →