#284D8B#284D8B

#284D8B is a dark, moderate blue. Relative luminance 0.076; OKLCH L 42.7% C 0.111 H 260.1°. Best body text is #FFFFFF at 8.32:1 contrast (WCAG AA passes).

Color values

HEX	#284D8B
RGB	rgb(40, 77, 139)
HSL	hsl(218, 55%, 35%)
HSV	hsv(218, 71%, 55%)
CMYK	cmyk(71.2%, 44.6%, 0%, 45.5%)
CIE-LAB	lab(33.18, 8.82, -38.42)
CIE-LCH	lch(33.18, 39.42, 282.94°)
OKLab	oklab(42.67% -0.0192 -0.1098)
OKLCH	oklch(42.67% 0.111 260.1)
XYZ	xyz(8.1875, 7.6221, 25.4608)
Luminance	0.0762 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#284D8B #8B6628

analogous

#287E8B #284D8B #35288B

triadic

#284D8B #8B284D #4D8B28

tetradic

#284D8B #8B287E #8B6628 #288B35

square

#284D8B #8B287E #8B6628 #288B35

split-complementary

#284D8B #8B3528 #7E8B28

monochromatic

#0D182C #1A335B #284D8B #3667BB #5D88D0

Accessibility & contrast

On white

8.32

#284D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.52

#284D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #284D8B

8.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##284D8B	#FFFFFF	#000000	##FFFFFF
##284D8B	1.00	8.32	2.52	8.32
#FFFFFF	8.32	1.00	21.00	1.00
#000000	2.52	21.00	1.00	21.00
##FFFFFF	8.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F538D

Deuteranopia (green-blind)

#1E4A8A

Tritanopia (blue-blind)

#005B65

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #284d8b;
/* rgb */ color: rgb(40, 77, 139);
/* oklch */ color: oklch(42.7% 0.111 260.1);

Tailwind

colors: {
  custom: {
    50: '#6e7ead',
    500: '#284d8b',
    950: '#000000',
  },
}

SCSS

$custom: #284d8b;
$custom-light: #6e7ead;
$custom-dark: #000000;

JSON

{
  "hex": "#284d8b",
  "rgb": {
    "r": 40,
    "g": 77,
    "b": 139
  },
  "hsl": {
    "h": 217.576,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.42672,
    "c": 0.11146,
    "h": 260.1
  },
  "luminance": 0.07623
}

Semantic roles & 50–950 ramp

primary

#284D8B

secondary

#B69359

accent

#A749DF

background

#F7F7FA

surface

#EDEEF4

border

#C8C9CE

text

#080910

muted

#7B7B7F

Preview Lab

Preview with #284D8B

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

Preview Lab → · Contrast checker → · Palette generator →