#1D178F#1D178F

#1D178F is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.5% C 0.183 H 271.8°. Best body text is #FFFFFF at 13.36:1 contrast (WCAG AA passes).

Color values

HEX	#1D178F
RGB	rgb(29, 23, 143)
HSL	hsl(243, 72%, 33%)
HSV	hsv(243, 84%, 56%)
CMYK	cmyk(79.7%, 83.9%, 0%, 43.9%)
CIE-LAB	lab(19.46, 43.66, -63.30)
CIE-LCH	lch(19.46, 76.90, 304.59°)
OKLab	oklab(32.49% 0.0056 -0.1832)
OKLCH	oklch(32.49% 0.183 271.8)
XYZ	xyz(5.7693, 2.8565, 26.2286)
Luminance	0.0286 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D178F #898F17

analogous

#174D8F #1D178F #59178F

triadic

#1D178F #8F1D17 #178F1D

tetradic

#1D178F #8F174D #898F17 #178F59

square

#1D178F #8F174D #898F17 #178F59

split-complementary

#1D178F #8F5917 #4D8F17

monochromatic

#080626 #120F5A #1D178F #281FC4 #4840E0

Accessibility & contrast

On white

13.36

#1D178F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1D178F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D178F

13.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D178F	#FFFFFF	#000000	##FFFFFF
##1D178F	1.00	13.36	1.57	13.36
#FFFFFF	13.36	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003592

Deuteranopia (green-blind)

#00298D

Tritanopia (blue-blind)

#003E54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1d178f;
/* rgb */ color: rgb(29, 23, 143);
/* oklch */ color: oklch(32.5% 0.183 271.8);

Tailwind

colors: {
  custom: {
    50: '#7058b1',
    500: '#1d178f',
    950: '#000000',
  },
}

SCSS

$custom: #1d178f;
$custom-light: #7058b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1d178f",
  "rgb": {
    "r": 29,
    "g": 23,
    "b": 143
  },
  "hsl": {
    "h": 243,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.32491,
    "c": 0.18327,
    "h": 271.8
  },
  "luminance": 0.02857
}

Semantic roles & 50–950 ramp

primary

#1D178F

secondary

#BAC141

accent

#EF39E6

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1D178F

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

Preview Lab → · Contrast checker → · Palette generator →