#283F5B#283F5B

#283F5B is a dark, muted cyan. Relative luminance 0.048; OKLCH L 36.2% C 0.057 H 254.0°. Best body text is #FFFFFF at 10.76:1 contrast (WCAG AA passes).

Color values

HEX	#283F5B
RGB	rgb(40, 63, 91)
HSL	hsl(213, 39%, 26%)
HSV	hsv(213, 56%, 36%)
CMYK	cmyk(56%, 30.8%, 0%, 64.3%)
CIE-LAB	lab(26.04, 0.20, -19.45)
CIE-LCH	lch(26.04, 19.45, 270.59°)
OKLab	oklab(36.22% -0.0156 -0.0546)
OKLCH	oklch(36.22% 0.057 254)
XYZ	xyz(4.5403, 4.7611, 10.5752)
Luminance	0.0476 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F5B #5B4428

analogous

#28585B #283F5B #2A285B

triadic

#283F5B #5B283F #3F5B28

tetradic

#283F5B #5B2858 #5B4428 #285B2A

square

#283F5B #5B2858 #5B4428 #285B2A

split-complementary

#283F5B #5B2A28 #585B28

monochromatic

#090F15 #152230 #283F5B #3B5C86 #4D7AB0

Accessibility & contrast

On white

10.76

#283F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#283F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F5B

10.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F5B	#FFFFFF	#000000	##FFFFFF
##283F5B	1.00	10.76	1.95	10.76
#FFFFFF	10.76	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#34405C

Deuteranopia (green-blind)

#2D3B5A

Tritanopia (blue-blind)

#0D4549

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #283f5b;
/* rgb */ color: rgb(40, 63, 91);
/* oklch */ color: oklch(36.2% 0.057 254.0);

Tailwind

colors: {
  custom: {
    50: '#667389',
    500: '#283f5b',
    950: '#000000',
  },
}

SCSS

$custom: #283f5b;
$custom-light: #667389;
$custom-dark: #000000;

JSON

{
  "hex": "#283f5b",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 91
  },
  "hsl": {
    "h": 212.941,
    "s": 38.931,
    "l": 25.686
  },
  "oklch": {
    "l": 0.3622,
    "c": 0.05676,
    "h": 254
  },
  "luminance": 0.04761
}

Semantic roles & 50–950 ramp

primary

#283F5B

secondary

#8E7251

accent

#9A59CF

background

#F6F7F8

surface

#EBEDF0

border

#C6C8CB

text

#06080B

muted

#7A7B7C

Preview Lab

Preview with #283F5B

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

Preview Lab → · Contrast checker → · Palette generator →