#283B59#283B59

#283B59 is a dark, muted blue. Relative luminance 0.043; OKLCH L 35.1% C 0.058 H 259.3°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#283B59
RGB	rgb(40, 59, 89)
HSL	hsl(217, 38%, 25%)
HSV	hsv(217, 55%, 35%)
CMYK	cmyk(55.1%, 33.7%, 0%, 65.1%)
CIE-LAB	lab(24.64, 2.18, -20.33)
CIE-LCH	lch(24.64, 20.45, 276.12°)
OKLab	oklab(35.09% -0.0108 -0.0572)
OKLCH	oklch(35.09% 0.058 259.3)
XYZ	xyz(4.2416, 4.3000, 10.0557)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B59 #594628

analogous

#285359 #283B59 #2E2859

triadic

#283B59 #59283B #3B5928

tetradic

#283B59 #592853 #594628 #28592E

square

#283B59 #592853 #594628 #28592E

split-complementary

#283B59 #592E28 #535928

monochromatic

#090E15 #151F2F #283B59 #3B5783 #4E73AD

Accessibility & contrast

On white

11.29

#283B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#283B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B59

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B59	#FFFFFF	#000000	##FFFFFF
##283B59	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3D5A

Deuteranopia (green-blind)

#2A3858

Tritanopia (blue-blind)

#114246

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #283b59;
/* rgb */ color: rgb(40, 59, 89);
/* oklch */ color: oklch(35.1% 0.058 259.3);

Tailwind

colors: {
  custom: {
    50: '#657088',
    500: '#283b59',
    950: '#000000',
  },
}

SCSS

$custom: #283b59;
$custom-light: #657088;
$custom-dark: #000000;

JSON

{
  "hex": "#283b59",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 89
  },
  "hsl": {
    "h": 216.735,
    "s": 37.984,
    "l": 25.294
  },
  "oklch": {
    "l": 0.35088,
    "c": 0.05818,
    "h": 259.3
  },
  "luminance": 0.043
}

Semantic roles & 50–950 ramp

primary

#283B59

secondary

#8C7551

accent

#A15ACE

background

#F6F6F8

surface

#EBECEF

border

#C6C7CA

text

#06070B

muted

#7A7A7C

Preview Lab

Preview with #283B59

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

Preview Lab → · Contrast checker → · Palette generator →