#4273DF#4273DF

#4273DF is a mid, vivid blue. Relative luminance 0.187; OKLCH L 57.9% C 0.173 H 263.6°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#4273DF
RGB	rgb(66, 115, 223)
HSL	hsl(221, 71%, 57%)
HSV	hsv(221, 70%, 87%)
CMYK	cmyk(70.4%, 48.4%, 0%, 12.5%)
CIE-LAB	lab(50.39, 19.40, -60.00)
CIE-LCH	lch(50.39, 63.06, 287.92°)
OKLab	oklab(57.9% -0.0194 -0.1722)
OKLCH	oklch(57.9% 0.173 263.6)
XYZ	xyz(21.6921, 18.7452, 72.2727)
Luminance	0.1875 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273DF #DFAE42

analogous

#42C2DF #4273DF #6042DF

triadic

#4273DF #DF4273 #73DF42

tetradic

#4273DF #DF42C2 #DFAE42 #42DF60

square

#4273DF #DF42C2 #DFAE42 #42DF60

split-complementary

#4273DF #DF6042 #C2DF42

monochromatic

#183D8E #2153C3 #4273DF #769AE8 #ABC1F1

Accessibility & contrast

On white

4.42

#4273DF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#4273DF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4273DF

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273DF	#FFFFFF	#000000	##000000
##4273DF	1.00	4.42	4.75	4.75
#FFFFFF	4.42	1.00	21.00	21.00
#000000	4.75	21.00	1.00	1.00
##000000	4.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3780E3

Deuteranopia (green-blind)

#0071DD

Tritanopia (blue-blind)

#008C9E

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #4273df;
/* rgb */ color: rgb(66, 115, 223);
/* oklch */ color: oklch(57.9% 0.173 263.6);

Tailwind

colors: {
  custom: {
    50: '#899aea',
    500: '#4273df',
    950: '#000000',
  },
}

SCSS

$custom: #4273df;
$custom-light: #899aea;
$custom-dark: #000000;

JSON

{
  "hex": "#4273df",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 223
  },
  "hsl": {
    "h": 221.274,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.57897,
    "c": 0.17329,
    "h": 263.6
  },
  "luminance": 0.18747
}

Semantic roles & 50–950 ramp

primary

#4273DF

secondary

#DFCA9E

accent

#B63AEE

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #4273DF

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

Preview Lab → · Contrast checker → · Palette generator →