#284F8B#284F8B

#284F8B is a dark, moderate blue. Relative luminance 0.079; OKLCH L 43.1% C 0.109 H 258.8°. Best body text is #FFFFFF at 8.14:1 contrast (WCAG AA passes).

Color values

HEX	#284F8B
RGB	rgb(40, 79, 139)
HSL	hsl(216, 55%, 35%)
HSV	hsv(216, 71%, 55%)
CMYK	cmyk(71.2%, 43.2%, 0%, 45.5%)
CIE-LAB	lab(33.79, 7.49, -37.45)
CIE-LCH	lch(33.79, 38.20, 281.31°)
OKLab	oklab(43.14% -0.0212 -0.1069)
OKLCH	oklch(43.14% 0.109 258.8)
XYZ	xyz(8.3296, 7.9063, 25.5082)
Luminance	0.0791 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#284F8B #8B6428

analogous

#28808B #284F8B #33288B

triadic

#284F8B #8B284F #4F8B28

tetradic

#284F8B #8B2880 #8B6428 #288B33

square

#284F8B #8B2880 #8B6428 #288B33

split-complementary

#284F8B #8B3328 #808B28

monochromatic

#0D192C #1A345B #284F8B #366ABB #5D8AD0

Accessibility & contrast

On white

8.14

#284F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.58

#284F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #284F8B

8.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##284F8B	#FFFFFF	#000000	##FFFFFF
##284F8B	1.00	8.14	2.58	8.14
#FFFFFF	8.14	1.00	21.00	1.00
#000000	2.58	21.00	1.00	21.00
##FFFFFF	8.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#33548D

Deuteranopia (green-blind)

#224B8A

Tritanopia (blue-blind)

#005D66

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #284f8b;
/* rgb */ color: rgb(40, 79, 139);
/* oklch */ color: oklch(43.1% 0.109 258.8);

Tailwind

colors: {
  custom: {
    50: '#6e7fad',
    500: '#284f8b',
    950: '#000000',
  },
}

SCSS

$custom: #284f8b;
$custom-light: #6e7fad;
$custom-dark: #000000;

JSON

{
  "hex": "#284f8b",
  "rgb": {
    "r": 40,
    "g": 79,
    "b": 139
  },
  "hsl": {
    "h": 216.364,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.43139,
    "c": 0.10901,
    "h": 258.8
  },
  "luminance": 0.07907
}

Semantic roles & 50–950 ramp

primary

#284F8B

secondary

#B69159

accent

#A449DF

background

#F7F7FA

surface

#EDEEF4

border

#C8C9CE

text

#080A10

muted

#7B7C7F

Preview Lab

Preview with #284F8B

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

Preview Lab → · Contrast checker → · Palette generator →