#4279CB#4279CB

#4279CB is a mid, vivid blue. Relative luminance 0.191; OKLCH L 57.9% C 0.139 H 258.3°. Best body text is #000000 at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#4279CB
RGB	rgb(66, 121, 203)
HSL	hsl(216, 57%, 53%)
HSV	hsv(216, 67%, 80%)
CMYK	cmyk(67.5%, 40.4%, 0%, 20.4%)
CIE-LAB	lab(50.85, 8.53, -47.91)
CIE-LCH	lch(50.85, 48.67, 280.10°)
OKLab	oklab(57.87% -0.0283 -0.1366)
OKLCH	oklch(57.87% 0.139 258.3)
XYZ	xyz(19.8597, 19.1428, 59.1366)
Luminance	0.1915 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4279CB #CB9442

analogous

#42BECB #4279CB #4F42CB

triadic

#4279CB #CB4279 #79CB42

tetradic

#4279CB #CB42BE #CB9442 #42CB4F

square

#4279CB #CB42BE #CB9442 #42CB4F

split-complementary

#4279CB #CB4F42 #BECB42

monochromatic

#204173 #2D5CA3 #4279CB #729BD8 #A2BDE5

Accessibility & contrast

On white

4.35

#4279CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.83

#4279CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4279CB

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4279CB	#FFFFFF	#000000	##000000
##4279CB	1.00	4.35	4.83	4.83
#FFFFFF	4.35	1.00	21.00	21.00
#000000	4.83	21.00	1.00	1.00
##000000	4.83	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5380CE

Deuteranopia (green-blind)

#3E73C9

Tritanopia (blue-blind)

#008C98

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #4279cb;
/* rgb */ color: rgb(66, 121, 203);
/* oklch */ color: oklch(57.9% 0.139 258.3);

Tailwind

colors: {
  custom: {
    50: '#859fdb',
    500: '#4279cb',
    950: '#000000',
  },
}

SCSS

$custom: #4279cb;
$custom-light: #859fdb;
$custom-dark: #000000;

JSON

{
  "hex": "#4279cb",
  "rgb": {
    "r": 66,
    "g": 121,
    "b": 203
  },
  "hsl": {
    "h": 215.912,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.57872,
    "c": 0.13948,
    "h": 258.3
  },
  "luminance": 0.19145
}

Semantic roles & 50–950 ramp

primary

#4279CB

secondary

#D2BA97

accent

#A348E0

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #4279CB

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

Preview Lab → · Contrast checker → · Palette generator →