#1D3F8B#1D3F8B

#1D3F8B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.0% C 0.133 H 263.4°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#1D3F8B
RGB	rgb(29, 63, 139)
HSL	hsl(221, 65%, 33%)
HSV	hsv(221, 79%, 55%)
CMYK	cmyk(79.1%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(28.59, 16.82, -45.84)
CIE-LCH	lch(28.59, 48.82, 290.15°)
OKLab	oklab(39.03% -0.0153 -0.1321)
OKLCH	oklch(39.03% 0.133 263.4)
XYZ	xyz(6.9427, 5.6795, 25.1514)
Luminance	0.0568 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D3F8B #8B691D

analogous

#1D768B #1D3F8B #321D8B

triadic

#1D3F8B #8B1D3F #3F8B1D

tetradic

#1D3F8B #8B1D76 #8B691D #1D8B32

square

#1D3F8B #8B1D76 #8B691D #1D8B32

split-complementary

#1D3F8B #8B321D #768B1D

monochromatic

#081126 #122858 #1D3F8B #2856BE #4976D9

Accessibility & contrast

On white

9.83

#1D3F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1D3F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D3F8B

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D3F8B	#FFFFFF	#000000	##FFFFFF
##1D3F8B	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#04498E

Deuteranopia (green-blind)

#003F89

Tritanopia (blue-blind)

#00525E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1d3f8b;
/* rgb */ color: rgb(29, 63, 139);
/* oklch */ color: oklch(39.0% 0.133 263.4);

Tailwind

colors: {
  custom: {
    50: '#6b73ad',
    500: '#1d3f8b',
    950: '#000000',
  },
}

SCSS

$custom: #1d3f8b;
$custom-light: #6b73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1d3f8b",
  "rgb": {
    "r": 29,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 221.455,
    "s": 65.476,
    "l": 32.941
  },
  "oklch": {
    "l": 0.39029,
    "c": 0.13297,
    "h": 263.4
  },
  "luminance": 0.0568
}

Semantic roles & 50–950 ramp

primary

#1D3F8B

secondary

#BB9849

accent

#B43FE8

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1D3F8B

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

Preview Lab → · Contrast checker → · Palette generator →