#283B63#283B63

#283B63 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.7% C 0.074 H 263.8°. Best body text is #FFFFFF at 11.08:1 contrast (WCAG AA passes).

Color values

HEX	#283B63
RGB	rgb(40, 59, 99)
HSL	hsl(221, 42%, 27%)
HSV	hsv(221, 60%, 39%)
CMYK	cmyk(59.6%, 40.4%, 0%, 61.2%)
CIE-LAB	lab(25.20, 5.82, -25.96)
CIE-LCH	lch(25.20, 26.61, 282.64°)
OKLab	oklab(35.71% -0.0079 -0.0735)
OKLCH	oklch(35.71% 0.074 263.8)
XYZ	xyz(4.6904, 4.4795, 12.4194)
Luminance	0.0448 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B63 #635028

analogous

#285963 #283B63 #332863

triadic

#283B63 #63283B #3B6328

tetradic

#283B63 #632859 #635028 #286333

square

#283B63 #632859 #635028 #286333

split-complementary

#283B63 #633328 #596328

monochromatic

#090D16 #162137 #283B63 #3A558F #4E70B7

Accessibility & contrast

On white

11.08

#283B63 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#283B63 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B63

11.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B63	#FFFFFF	#000000	##FFFFFF
##283B63	1.00	11.08	1.90	11.08
#FFFFFF	11.08	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3F65

Deuteranopia (green-blind)

#233962

Tritanopia (blue-blind)

#03444A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #283b63;
/* rgb */ color: rgb(40, 59, 99);
/* oklch */ color: oklch(35.7% 0.074 263.8);

Tailwind

colors: {
  custom: {
    50: '#67708f',
    500: '#283b63',
    950: '#000000',
  },
}

SCSS

$custom: #283b63;
$custom-light: #67708f;
$custom-dark: #000000;

JSON

{
  "hex": "#283b63",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 99
  },
  "hsl": {
    "h": 220.678,
    "s": 42.446,
    "l": 27.255
  },
  "oklch": {
    "l": 0.35705,
    "c": 0.07397,
    "h": 263.8
  },
  "luminance": 0.0448
}

Semantic roles & 50–950 ramp

primary

#283B63

secondary

#968051

accent

#AA56D2

background

#F6F6F8

surface

#EBECF0

border

#C6C7CB

text

#06070C

muted

#7A7A7D

Preview Lab

Preview with #283B63

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

Preview Lab → · Contrast checker → · Palette generator →