#4271BB#4271BB

#4271BB is a mid, vivid blue. Relative luminance 0.166; OKLCH L 55.1% C 0.127 H 259.1°. Best body text is #FFFFFF at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#4271BB
RGB	rgb(66, 113, 187)
HSL	hsl(217, 48%, 50%)
HSV	hsv(217, 65%, 73%)
CMYK	cmyk(64.7%, 39.6%, 0%, 26.7%)
CIE-LAB	lab(47.69, 7.82, -43.76)
CIE-LCH	lch(47.69, 44.45, 280.14°)
OKLab	oklab(55.13% -0.0239 -0.1245)
OKLCH	oklch(55.13% 0.127 259.1)
XYZ	xyz(17.1183, 16.5547, 49.2973)
Luminance	0.1656 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4271BB #BB8C42

analogous

#42AEBB #4271BB #4F42BB

triadic

#4271BB #BB4271 #71BB42

tetradic

#4271BB #BB42AE #BB8C42 #42BB4F

square

#4271BB #BB42AE #BB8C42 #42BB4F

split-complementary

#4271BB #BB4F42 #AEBB42

monochromatic

#223A61 #32568E #4271BB #6E93CC #9CB5DC

Accessibility & contrast

On white

4.87

#4271BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.31

#4271BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4271BB

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4271BB	#FFFFFF	#000000	##FFFFFF
##4271BB	1.00	4.87	4.31	4.87
#FFFFFF	4.87	1.00	21.00	1.00
#000000	4.31	21.00	1.00	21.00
##FFFFFF	4.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5077BE

Deuteranopia (green-blind)

#3E6CB9

Tritanopia (blue-blind)

#00828D

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #4271bb;
/* rgb */ color: rgb(66, 113, 187);
/* oklch */ color: oklch(55.1% 0.127 259.1);

Tailwind

colors: {
  custom: {
    50: '#8299d0',
    500: '#4271bb',
    950: '#000000',
  },
}

SCSS

$custom: #4271bb;
$custom-light: #8299d0;
$custom-dark: #000000;

JSON

{
  "hex": "#4271bb",
  "rgb": {
    "r": 66,
    "g": 113,
    "b": 187
  },
  "hsl": {
    "h": 216.694,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.55133,
    "c": 0.12677,
    "h": 259.1
  },
  "luminance": 0.16556
}

Semantic roles & 50–950 ramp

primary

#4271BB

secondary

#C8B391

accent

#A350D7

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #4271BB

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

Preview Lab → · Contrast checker → · Palette generator →