#284FA3#284FA3

#284FA3 is a dark, vivid blue. Relative luminance 0.087; OKLCH L 44.9% C 0.143 H 263.1°. Best body text is #FFFFFF at 7.67:1 contrast (WCAG AA passes).

Color values

HEX	#284FA3
RGB	rgb(40, 79, 163)
HSL	hsl(221, 61%, 40%)
HSV	hsv(221, 75%, 64%)
CMYK	cmyk(75.5%, 51.5%, 0%, 36.1%)
CIE-LAB	lab(35.37, 16.79, -49.44)
CIE-LCH	lch(35.37, 52.21, 288.75°)
OKLab	oklab(44.87% -0.0171 -0.1422)
OKLCH	oklch(44.87% 0.143 263.1)
XYZ	xyz(10.2796, 8.6863, 35.7781)
Luminance	0.0869 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#284FA3 #A37C28

analogous

#288CA3 #284FA3 #3F28A3

triadic

#284FA3 #A3284F #4FA328

tetradic

#284FA3 #A3288C #A37C28 #28A33F

square

#284FA3 #A3288C #A37C28 #28A33F

split-complementary

#284FA3 #A33F28 #8CA328

monochromatic

#101F41 #1C3772 #284FA3 #3A69CF #6B8EDB

Accessibility & contrast

On white

7.67

#284FA3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.74

#284FA3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #284FA3

7.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##284FA3	#FFFFFF	#000000	##FFFFFF
##284FA3	1.00	7.67	2.74	7.67
#FFFFFF	7.67	1.00	21.00	1.00
#000000	2.74	21.00	1.00	21.00
##FFFFFF	7.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A59A6

Deuteranopia (green-blind)

#004EA1

Tritanopia (blue-blind)

#006371

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #284fa3;
/* rgb */ color: rgb(40, 79, 163);
/* oklch */ color: oklch(44.9% 0.143 263.1);

Tailwind

colors: {
  custom: {
    50: '#747fbf',
    500: '#284fa3',
    950: '#000000',
  },
}

SCSS

$custom: #284fa3;
$custom-light: #747fbf;
$custom-dark: #000000;

JSON

{
  "hex": "#284fa3",
  "rgb": {
    "r": 40,
    "g": 79,
    "b": 163
  },
  "hsl": {
    "h": 220.976,
    "s": 60.591,
    "l": 39.804
  },
  "oklch": {
    "l": 0.44867,
    "c": 0.14321,
    "h": 263.1
  },
  "luminance": 0.08687
}

Semantic roles & 50–950 ramp

primary

#284FA3

secondary

#C1A466

accent

#B144E4

background

#F7F7FB

surface

#EEEEF7

border

#C9C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #284FA3

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

Preview Lab → · Contrast checker → · Palette generator →