#4278DD#4278DD

#4278DD is a mid, vivid blue. Relative luminance 0.198; OKLCH L 58.8% C 0.165 H 261.6°. Best body text is #000000 at 4.96:1 contrast (WCAG AA passes).

Color values

HEX	#4278DD
RGB	rgb(66, 120, 221)
HSL	hsl(219, 70%, 56%)
HSV	hsv(219, 70%, 87%)
CMYK	cmyk(70.1%, 45.7%, 0%, 13.3%)
CIE-LAB	lab(51.62, 15.57, -56.89)
CIE-LCH	lch(51.62, 58.98, 285.31°)
OKLab	oklab(58.8% -0.024 -0.163)
OKLCH	oklch(58.8% 0.165 261.6)
XYZ	xyz(22.0097, 19.8093, 71.0562)
Luminance	0.1981 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278DD #DDA742

analogous

#42C6DD #4278DD #5A42DD

triadic

#4278DD #DD4278 #78DD42

tetradic

#4278DD #DD42C6 #DDA742 #42DD5A

square

#4278DD #DD42C6 #DDA742 #42DD5A

split-complementary

#4278DD #DD5A42 #C6DD42

monochromatic

#19418C #2259BF #4278DD #769DE6 #AAC2F0

Accessibility & contrast

On white

4.23

#4278DD on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.96

#4278DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278DD

4.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278DD	#FFFFFF	#000000	##000000
##4278DD	1.00	4.23	4.96	4.96
#FFFFFF	4.23	1.00	21.00	21.00
#000000	4.96	21.00	1.00	1.00
##000000	4.96	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4483E1

Deuteranopia (green-blind)

#2374DB

Tritanopia (blue-blind)

#0090A0

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #4278dd;
/* rgb */ color: rgb(66, 120, 221);
/* oklch */ color: oklch(58.8% 0.165 261.6);

Tailwind

colors: {
  custom: {
    50: '#889ee8',
    500: '#4278dd',
    950: '#000000',
  },
}

SCSS

$custom: #4278dd;
$custom-light: #889ee8;
$custom-dark: #000000;

JSON

{
  "hex": "#4278dd",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 221
  },
  "hsl": {
    "h": 219.097,
    "s": 69.507,
    "l": 56.275
  },
  "oklch": {
    "l": 0.58802,
    "c": 0.16473,
    "h": 261.6
  },
  "luminance": 0.19812
}

Semantic roles & 50–950 ramp

primary

#4278DD

secondary

#DDC79D

accent

#AF3BEC

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #4278DD

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

Preview Lab → · Contrast checker → · Palette generator →