#4271B9#4271B9

#4271B9 is a mid, vivid blue. Relative luminance 0.165; OKLCH L 55.0% C 0.124 H 258.7°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#4271B9
RGB	rgb(66, 113, 185)
HSL	hsl(216, 47%, 49%)
HSV	hsv(216, 64%, 73%)
CMYK	cmyk(64.3%, 38.9%, 0%, 27.5%)
CIE-LAB	lab(47.58, 7.12, -42.77)
CIE-LCH	lch(47.58, 43.36, 279.45°)
OKLab	oklab(55.01% -0.0243 -0.1216)
OKLCH	oklch(55.01% 0.124 258.7)
XYZ	xyz(16.9057, 16.4697, 48.1776)
Luminance	0.1647 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4271B9 #B98A42

analogous

#42ACB9 #4271B9 #4F42B9

triadic

#4271B9 #B94271 #71B942

tetradic

#4271B9 #B942AC #B98A42 #42B94F

square

#4271B9 #B942AC #B98A42 #42B94F

split-complementary

#4271B9 #B94F42 #ACB942

monochromatic

#223A5F #32558C #4271B9 #6D92CB #9AB4DB

Accessibility & contrast

On white

4.89

#4271B9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.29

#4271B9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4271B9

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4271B9	#FFFFFF	#000000	##FFFFFF
##4271B9	1.00	4.89	4.29	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.29	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5177BC

Deuteranopia (green-blind)

#406CB8

Tritanopia (blue-blind)

#00818C

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #4271b9;
/* rgb */ color: rgb(66, 113, 185);
/* oklch */ color: oklch(55.0% 0.124 258.7);

Tailwind

colors: {
  custom: {
    50: '#8299ce',
    500: '#4271b9',
    950: '#000000',
  },
}

SCSS

$custom: #4271b9;
$custom-light: #8299ce;
$custom-dark: #000000;

JSON

{
  "hex": "#4271b9",
  "rgb": {
    "r": 66,
    "g": 113,
    "b": 185
  },
  "hsl": {
    "h": 216.303,
    "s": 47.41,
    "l": 49.216
  },
  "oklch": {
    "l": 0.55013,
    "c": 0.12403,
    "h": 258.7
  },
  "luminance": 0.16471
}

Semantic roles & 50–950 ramp

primary

#4271B9

secondary

#C7B190

accent

#A251D7

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #4271B9

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

Preview Lab → · Contrast checker → · Palette generator →