#284EA3#284EA3

#284EA3 is a dark, vivid blue. Relative luminance 0.085; OKLCH L 44.6% C 0.144 H 263.5°. Best body text is #FFFFFF at 7.75:1 contrast (WCAG AA passes).

Color values

HEX	#284EA3
RGB	rgb(40, 78, 163)
HSL	hsl(221, 61%, 40%)
HSV	hsv(221, 75%, 64%)
CMYK	cmyk(75.5%, 52.1%, 0%, 36.1%)
CIE-LAB	lab(35.09, 17.46, -49.90)
CIE-LCH	lch(35.09, 52.86, 289.28°)
OKLab	oklab(44.65% -0.0163 -0.1435)
OKLCH	oklch(44.65% 0.144 263.5)
XYZ	xyz(10.2080, 8.5431, 35.7542)
Luminance	0.0854 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#284EA3 #A37D28

analogous

#288CA3 #284EA3 #3F28A3

triadic

#284EA3 #A3284E #4EA328

tetradic

#284EA3 #A3288C #A37D28 #28A33F

square

#284EA3 #A3288C #A37D28 #28A33F

split-complementary

#284EA3 #A33F28 #8CA328

monochromatic

#101F41 #1C3672 #284EA3 #3A68CF #6B8DDB

Accessibility & contrast

On white

7.75

#284EA3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#284EA3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #284EA3

7.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##284EA3	#FFFFFF	#000000	##FFFFFF
##284EA3	1.00	7.75	2.71	7.75
#FFFFFF	7.75	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1758A6

Deuteranopia (green-blind)

#004DA1

Tritanopia (blue-blind)

#006271

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #284ea3;
/* rgb */ color: rgb(40, 78, 163);
/* oklch */ color: oklch(44.6% 0.144 263.5);

Tailwind

colors: {
  custom: {
    50: '#747fbf',
    500: '#284ea3',
    950: '#000000',
  },
}

SCSS

$custom: #284ea3;
$custom-light: #747fbf;
$custom-dark: #000000;

JSON

{
  "hex": "#284ea3",
  "rgb": {
    "r": 40,
    "g": 78,
    "b": 163
  },
  "hsl": {
    "h": 221.463,
    "s": 60.591,
    "l": 39.804
  },
  "oklch": {
    "l": 0.4465,
    "c": 0.14447,
    "h": 263.5
  },
  "luminance": 0.08544
}

Semantic roles & 50–950 ramp

primary

#284EA3

secondary

#C1A566

accent

#B244E4

background

#F7F7FB

surface

#EEEEF7

border

#C9C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #284EA3

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

Preview Lab → · Contrast checker → · Palette generator →