#1D378F#1D378F

#1D378F is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.7% C 0.149 H 266.4°. Best body text is #FFFFFF at 10.52:1 contrast (WCAG AA passes).

Color values

HEX	#1D378F
RGB	rgb(29, 55, 143)
HSL	hsl(226, 66%, 34%)
HSV	hsv(226, 80%, 56%)
CMYK	cmyk(79.7%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(26.67, 23.96, -51.44)
CIE-LCH	lch(26.67, 56.74, 294.97°)
OKLab	oklab(37.69% -0.0093 -0.1487)
OKLCH	oklch(37.69% 0.149 266.4)
XYZ	xyz(6.8291, 4.9760, 26.5818)
Luminance	0.0498 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D378F #8F751D

analogous

#1D708F #1D378F #3C1D8F

triadic

#1D378F #8F1D37 #378F1D

tetradic

#1D378F #8F1D70 #8F751D #1D8F3C

square

#1D378F #8F1D70 #8F751D #1D8F3C

split-complementary

#1D378F #8F3C1D #708F1D

monochromatic

#081029 #13235C #1D378F #274BC2 #4C6CDB

Accessibility & contrast

On white

10.52

#1D378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1D378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D378F

10.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D378F	#FFFFFF	#000000	##FFFFFF
##1D378F	1.00	10.52	2.00	10.52
#FFFFFF	10.52	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004592

Deuteranopia (green-blind)

#003A8D

Tritanopia (blue-blind)

#004D5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1d378f;
/* rgb */ color: rgb(29, 55, 143);
/* oklch */ color: oklch(37.7% 0.149 266.4);

Tailwind

colors: {
  custom: {
    50: '#6d6db1',
    500: '#1d378f',
    950: '#000000',
  },
}

SCSS

$custom: #1d378f;
$custom-light: #6d6db1;
$custom-dark: #000000;

JSON

{
  "hex": "#1d378f",
  "rgb": {
    "r": 29,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 226.316,
    "s": 66.279,
    "l": 33.725
  },
  "oklch": {
    "l": 0.37686,
    "c": 0.14896,
    "h": 266.4
  },
  "luminance": 0.04977
}

Semantic roles & 50–950 ramp

primary

#1D378F

secondary

#BDA34B

accent

#C23FE9

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1D378F

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

Preview Lab → · Contrast checker → · Palette generator →