#1F3487#1F3487

#1F3487 is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.4% C 0.141 H 267.8°. Best body text is #FFFFFF at 11.06:1 contrast (WCAG AA passes).

Color values

HEX	#1F3487
RGB	rgb(31, 52, 135)
HSL	hsl(228, 63%, 33%)
HSV	hsv(228, 77%, 53%)
CMYK	cmyk(77%, 61.5%, 0%, 47.1%)
CIE-LAB	lab(25.25, 23.10, -48.78)
CIE-LCH	lch(25.25, 53.98, 295.34°)
OKLab	oklab(36.44% -0.0055 -0.1409)
OKLCH	oklch(36.44% 0.141 267.8)
XYZ	xyz(6.1647, 4.4959, 23.4599)
Luminance	0.0450 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3487 #87721F

analogous

#1F6887 #1F3487 #3E1F87

triadic

#1F3487 #871F34 #34871F

tetradic

#1F3487 #871F68 #87721F #1F873E

square

#1F3487 #871F68 #87721F #1F873E

split-complementary

#1F3487 #873E1F #68871F

monochromatic

#080E23 #142155 #1F3487 #2A47B9 #4B67D6

Accessibility & contrast

On white

11.06

#1F3487 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#1F3487 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3487

11.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3487	#FFFFFF	#000000	##FFFFFF
##1F3487	1.00	11.06	1.90	11.06
#FFFFFF	11.06	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00418A

Deuteranopia (green-blind)

#003785

Tritanopia (blue-blind)

#004958

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1f3487;
/* rgb */ color: rgb(31, 52, 135);
/* oklch */ color: oklch(36.4% 0.141 267.8);

Tailwind

colors: {
  custom: {
    50: '#6b6bab',
    500: '#1f3487',
    950: '#000000',
  },
}

SCSS

$custom: #1f3487;
$custom-light: #6b6bab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3487",
  "rgb": {
    "r": 31,
    "g": 52,
    "b": 135
  },
  "hsl": {
    "h": 227.885,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36439,
    "c": 0.141,
    "h": 267.8
  },
  "luminance": 0.04497
}

Semantic roles & 50–950 ramp

primary

#1F3487

secondary

#B8A24A

accent

#C542E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1F3487

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

Preview Lab → · Contrast checker → · Palette generator →