#4273DD#4273DD

#4273DD is a mid, vivid blue. Relative luminance 0.186; OKLCH L 57.8% C 0.171 H 263.4°. Best body text is #000000 at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#4273DD
RGB	rgb(66, 115, 221)
HSL	hsl(221, 70%, 56%)
HSV	hsv(221, 70%, 87%)
CMYK	cmyk(70.1%, 48%, 0%, 13.3%)
CIE-LAB	lab(50.26, 18.68, -59.08)
CIE-LCH	lch(50.26, 61.96, 287.55°)
OKLab	oklab(57.76% -0.0197 -0.1695)
OKLCH	oklch(57.76% 0.171 263.4)
XYZ	xyz(21.4240, 18.6379, 70.8610)
Luminance	0.1864 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273DD #DDAC42

analogous

#42C1DD #4273DD #5F42DD

triadic

#4273DD #DD4273 #73DD42

tetradic

#4273DD #DD42C1 #DDAC42 #42DD5F

square

#4273DD #DD42C1 #DDAC42 #42DD5F

split-complementary

#4273DD #DD5F42 #C1DD42

monochromatic

#193D8C #2254BF #4273DD #7699E6 #AAC0F0

Accessibility & contrast

On white

4.44

#4273DD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.73

#4273DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4273DD

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273DD	#FFFFFF	#000000	##000000
##4273DD	1.00	4.44	4.73	4.73
#FFFFFF	4.44	1.00	21.00	21.00
#000000	4.73	21.00	1.00	1.00
##000000	4.73	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#397FE1

Deuteranopia (green-blind)

#0971DB

Tritanopia (blue-blind)

#008C9D

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #4273dd;
/* rgb */ color: rgb(66, 115, 221);
/* oklch */ color: oklch(57.8% 0.171 263.4);

Tailwind

colors: {
  custom: {
    50: '#889ae8',
    500: '#4273dd',
    950: '#000000',
  },
}

SCSS

$custom: #4273dd;
$custom-light: #889ae8;
$custom-dark: #000000;

JSON

{
  "hex": "#4273dd",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 221
  },
  "hsl": {
    "h": 221.032,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.5776,
    "c": 0.17062,
    "h": 263.4
  },
  "luminance": 0.1864
}

Semantic roles & 50–950 ramp

primary

#4273DD

secondary

#DDC99D

accent

#B43BEC

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #4273DD

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

Preview Lab → · Contrast checker → · Palette generator →