#283F8B#283F8B

#283F8B is a dark, vivid blue. Relative luminance 0.059; OKLCH L 39.5% C 0.130 H 267.5°. Best body text is #FFFFFF at 9.66:1 contrast (WCAG AA passes).

Color values

HEX	#283F8B
RGB	rgb(40, 63, 139)
HSL	hsl(226, 55%, 35%)
HSV	hsv(226, 71%, 55%)
CMYK	cmyk(71.2%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(29.08, 18.33, -45.02)
CIE-LCH	lch(29.08, 48.61, 292.16°)
OKLab	oklab(39.54% -0.0058 -0.1295)
OKLCH	oklch(39.54% 0.13 267.5)
XYZ	xyz(7.3112, 5.8695, 25.1687)
Luminance	0.0587 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F8B #8B7428

analogous

#28708B #283F8B #43288B

triadic

#283F8B #8B283F #3F8B28

tetradic

#283F8B #8B2870 #8B7428 #288B43

square

#283F8B #8B2870 #8B7428 #288B43

split-complementary

#283F8B #8B4328 #708B28

monochromatic

#0D142C #1A295B #283F8B #3655BB #5D78D0

Accessibility & contrast

On white

9.66

#283F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#283F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F8B

9.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F8B	#FFFFFF	#000000	##FFFFFF
##283F8B	1.00	9.66	2.17	9.66
#FFFFFF	9.66	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#09498E

Deuteranopia (green-blind)

#004089

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #283f8b;
/* rgb */ color: rgb(40, 63, 139);
/* oklch */ color: oklch(39.5% 0.130 267.5);

Tailwind

colors: {
  custom: {
    50: '#6f73ad',
    500: '#283f8b',
    950: '#000000',
  },
}

SCSS

$custom: #283f8b;
$custom-light: #6f73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283f8b",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 226.061,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.39537,
    "c": 0.12959,
    "h": 267.5
  },
  "luminance": 0.0587
}

Semantic roles & 50–950 ramp

primary

#283F8B

secondary

#B6A059

accent

#BC49DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #283F8B

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

Preview Lab → · Contrast checker → · Palette generator →