#1D3F8A#1D3F8A

#1D3F8A is a dark, vivid blue. Relative luminance 0.057; OKLCH L 38.9% C 0.132 H 263.3°. Best body text is #FFFFFF at 9.86:1 contrast (WCAG AA passes).

Color values

HEX	#1D3F8A
RGB	rgb(29, 63, 138)
HSL	hsl(221, 65%, 33%)
HSV	hsv(221, 79%, 54%)
CMYK	cmyk(79%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(28.51, 16.41, -45.34)
CIE-LCH	lch(28.51, 48.22, 289.90°)
OKLab	oklab(38.95% -0.0154 -0.1306)
OKLCH	oklch(38.95% 0.132 263.3)
XYZ	xyz(6.8700, 5.6504, 24.7684)
Luminance	0.0565 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D3F8A #8A681D

analogous

#1D768A #1D3F8A #311D8A

triadic

#1D3F8A #8A1D3F #3F8A1D

tetradic

#1D3F8A #8A1D76 #8A681D #1D8A31

square

#1D3F8A #8A1D76 #8A681D #1D8A31

split-complementary

#1D3F8A #8A311D #768A1D

monochromatic

#081125 #122857 #1D3F8A #2856BD #4976D9

Accessibility & contrast

On white

9.86

#1D3F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#1D3F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D3F8A

9.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D3F8A	#FFFFFF	#000000	##FFFFFF
##1D3F8A	1.00	9.86	2.13	9.86
#FFFFFF	9.86	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#07488D

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1d3f8a;
/* rgb */ color: rgb(29, 63, 138);
/* oklch */ color: oklch(38.9% 0.132 263.3);

Tailwind

colors: {
  custom: {
    50: '#6b73ad',
    500: '#1d3f8a',
    950: '#000000',
  },
}

SCSS

$custom: #1d3f8a;
$custom-light: #6b73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1d3f8a",
  "rgb": {
    "r": 29,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 221.284,
    "s": 65.269,
    "l": 32.745
  },
  "oklch": {
    "l": 0.38947,
    "c": 0.13154,
    "h": 263.3
  },
  "luminance": 0.05651
}

Semantic roles & 50–950 ramp

primary

#1D3F8A

secondary

#BB9748

accent

#B440E8

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1D3F8A

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

Preview Lab → · Contrast checker → · Palette generator →