#1F178B#1F178B

#1F178B is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.1% C 0.178 H 273.0°. Best body text is #FFFFFF at 13.52:1 contrast (WCAG AA passes).

Color values

HEX	#1F178B
RGB	rgb(31, 23, 139)
HSL	hsl(244, 72%, 32%)
HSV	hsv(244, 83%, 55%)
CMYK	cmyk(77.7%, 83.5%, 0%, 45.5%)
CIE-LAB	lab(19.09, 42.51, -61.42)
CIE-LCH	lch(19.09, 74.69, 304.68°)
OKLab	oklab(32.12% 0.0092 -0.1777)
OKLCH	oklch(32.12% 0.178 273)
XYZ	xyz(5.5301, 2.7676, 24.6638)
Luminance	0.0277 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178B #838B17

analogous

#17498B #1F178B #59178B

triadic

#1F178B #8B1F17 #178B1F

tetradic

#1F178B #8B1749 #838B17 #178B59

square

#1F178B #8B1749 #838B17 #178B59

split-complementary

#1F178B #8B5917 #498B17

monochromatic

#080622 #130E56 #1F178B #2B20C0 #493DDF

Accessibility & contrast

On white

13.52

#1F178B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#1F178B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178B

13.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178B	#FFFFFF	#000000	##FFFFFF
##1F178B	1.00	13.52	1.55	13.52
#FFFFFF	13.52	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00348E

Deuteranopia (green-blind)

#002989

Tritanopia (blue-blind)

#003C52

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1f178b;
/* rgb */ color: rgb(31, 23, 139);
/* oklch */ color: oklch(32.1% 0.178 273.0);

Tailwind

colors: {
  custom: {
    50: '#6f58ae',
    500: '#1f178b',
    950: '#000000',
  },
}

SCSS

$custom: #1f178b;
$custom-light: #6f58ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178b",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 139
  },
  "hsl": {
    "h": 244.138,
    "s": 71.605,
    "l": 31.765
  },
  "oklch": {
    "l": 0.32123,
    "c": 0.17793,
    "h": 273
  },
  "luminance": 0.02768
}

Semantic roles & 50–950 ramp

primary

#1F178B

secondary

#B6BF3F

accent

#EE39E2

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#090310

muted

#7B787F

Preview Lab

Preview with #1F178B

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

Preview Lab → · Contrast checker → · Palette generator →