#283B57#283B57

#283B57 is a dark, muted blue. Relative luminance 0.043; OKLCH L 35.0% C 0.055 H 257.9°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#283B57
RGB	rgb(40, 59, 87)
HSL	hsl(216, 37%, 25%)
HSV	hsv(216, 54%, 34%)
CMYK	cmyk(54%, 32.2%, 0%, 65.9%)
CIE-LAB	lab(24.53, 1.47, -19.19)
CIE-LCH	lch(24.53, 19.24, 274.38°)
OKLab	oklab(34.97% -0.0115 -0.0538)
OKLCH	oklch(34.97% 0.055 257.9)
XYZ	xyz(4.1588, 4.2669, 9.6194)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B57 #574428

analogous

#285257 #283B57 #2D2857

triadic

#283B57 #57283B #3B5728

tetradic

#283B57 #572852 #574428 #28572D

square

#283B57 #572852 #574428 #28572D

split-complementary

#283B57 #572D28 #525728

monochromatic

#0A0E15 #151F2D #283B57 #3B5781 #4F74AB

Accessibility & contrast

On white

11.33

#283B57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#283B57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B57

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B57	#FFFFFF	#000000	##FFFFFF
##283B57	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#303D58

Deuteranopia (green-blind)

#2B3856

Tritanopia (blue-blind)

#124145

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #283b57;
/* rgb */ color: rgb(40, 59, 87);
/* oklch */ color: oklch(35.0% 0.055 257.9);

Tailwind

colors: {
  custom: {
    50: '#657086',
    500: '#283b57',
    950: '#000000',
  },
}

SCSS

$custom: #283b57;
$custom-light: #657086;
$custom-dark: #000000;

JSON

{
  "hex": "#283b57",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 87
  },
  "hsl": {
    "h": 215.745,
    "s": 37.008,
    "l": 24.902
  },
  "oklch": {
    "l": 0.34972,
    "c": 0.05506,
    "h": 257.9
  },
  "luminance": 0.04267
}

Semantic roles & 50–950 ramp

primary

#283B57

secondary

#8A7351

accent

#9F5BCD

background

#F6F6F8

surface

#EBECEF

border

#C6C7CA

text

#06070B

muted

#7A7A7C

Preview Lab

Preview with #283B57

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

Preview Lab → · Contrast checker → · Palette generator →