#1D37A8#1D37A8

#1D37A8 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 40.1% C 0.183 H 266.9°. Best body text is #FFFFFF at 9.70:1 contrast (WCAG AA passes).

Color values

HEX	#1D37A8
RGB	rgb(29, 55, 168)
HSL	hsl(229, 71%, 39%)
HSV	hsv(229, 83%, 66%)
CMYK	cmyk(82.7%, 67.3%, 0%, 34.1%)
CIE-LAB	lab(28.95, 33.61, -62.92)
CIE-LCH	lch(28.95, 71.34, 298.11°)
OKLab	oklab(40.08% -0.0098 -0.1823)
OKLCH	oklch(40.08% 0.183 266.9)
XYZ	xyz(8.9383, 5.8197, 37.6904)
Luminance	0.0582 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D37A8 #A88E1D

analogous

#1D7CA8 #1D37A8 #481DA8

triadic

#1D37A8 #A81D37 #37A81D

tetradic

#1D37A8 #A81D7C #A88E1D #1DA848

square

#1D37A8 #A81D7C #A88E1D #1DA848

split-complementary

#1D37A8 #A8481D #7CA81D

monochromatic

#0B1540 #142674 #1D37A8 #2849DA #5C76E3

Accessibility & contrast

On white

9.70

#1D37A8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1D37A8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D37A8

9.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D37A8	#FFFFFF	#000000	##FFFFFF
##1D37A8	1.00	9.70	2.16	9.70
#FFFFFF	9.70	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BAC

Deuteranopia (green-blind)

#003EA6

Tritanopia (blue-blind)

#00566A

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1d37a8;
/* rgb */ color: rgb(29, 55, 168);
/* oklch */ color: oklch(40.1% 0.183 266.9);

Tailwind

colors: {
  custom: {
    50: '#736dc3',
    500: '#1d37a8',
    950: '#000000',
  },
}

SCSS

$custom: #1d37a8;
$custom-light: #736dc3;
$custom-dark: #000000;

JSON

{
  "hex": "#1d37a8",
  "rgb": {
    "r": 29,
    "g": 55,
    "b": 168
  },
  "hsl": {
    "h": 228.777,
    "s": 70.558,
    "l": 38.627
  },
  "oklch": {
    "l": 0.40075,
    "c": 0.18254,
    "h": 266.9
  },
  "luminance": 0.05821
}

Semantic roles & 50–950 ramp

primary

#1D37A8

secondary

#C7B35A

accent

#CC3AED

background

#F7F6FC

surface

#EEEBF8

border

#C9C6D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #1D37A8

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

Preview Lab → · Contrast checker → · Palette generator →