#284E8A#284E8A

#284E8A is a dark, moderate blue. Relative luminance 0.077; OKLCH L 42.8% C 0.109 H 259.2°. Best body text is #FFFFFF at 8.24:1 contrast (WCAG AA passes).

Color values

HEX	#284E8A
RGB	rgb(40, 78, 138)
HSL	hsl(217, 55%, 35%)
HSV	hsv(217, 71%, 54%)
CMYK	cmyk(71%, 43.5%, 0%, 45.9%)
CIE-LAB	lab(33.42, 7.77, -37.42)
CIE-LCH	lch(33.42, 38.22, 281.73°)
OKLab	oklab(42.84% -0.0204 -0.1069)
OKLCH	oklch(42.84% 0.109 259.2)
XYZ	xyz(8.1853, 7.7340, 25.1013)
Luminance	0.0774 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#284E8A #8A6428

analogous

#287F8A #284E8A #33288A

triadic

#284E8A #8A284E #4E8A28

tetradic

#284E8A #8A287F #8A6428 #288A33

square

#284E8A #8A287F #8A6428 #288A33

split-complementary

#284E8A #8A3328 #7F8A28

monochromatic

#0C182B #1A335B #284E8A #3669B9 #5D89D0

Accessibility & contrast

On white

8.24

#284E8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#284E8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #284E8A

8.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##284E8A	#FFFFFF	#000000	##FFFFFF
##284E8A	1.00	8.24	2.55	8.24
#FFFFFF	8.24	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#32538C

Deuteranopia (green-blind)

#214A89

Tritanopia (blue-blind)

#005C65

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #284e8a;
/* rgb */ color: rgb(40, 78, 138);
/* oklch */ color: oklch(42.8% 0.109 259.2);

Tailwind

colors: {
  custom: {
    50: '#6e7fac',
    500: '#284e8a',
    950: '#000000',
  },
}

SCSS

$custom: #284e8a;
$custom-light: #6e7fac;
$custom-dark: #000000;

JSON

{
  "hex": "#284e8a",
  "rgb": {
    "r": 40,
    "g": 78,
    "b": 138
  },
  "hsl": {
    "h": 216.735,
    "s": 55.056,
    "l": 34.902
  },
  "oklch": {
    "l": 0.42837,
    "c": 0.10878,
    "h": 259.2
  },
  "luminance": 0.07735
}

Semantic roles & 50–950 ramp

primary

#284E8A

secondary

#B59159

accent

#A549DE

background

#F7F7FA

surface

#EDEEF4

border

#C8C9CE

text

#080A10

muted

#7B7C7F

Preview Lab

Preview with #284E8A

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

Preview Lab → · Contrast checker → · Palette generator →