#1F3A87#1F3A87

#1F3A87 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.133 H 265.7°. Best body text is #FFFFFF at 10.43:1 contrast (WCAG AA passes).

Color values

HEX	#1F3A87
RGB	rgb(31, 58, 135)
HSL	hsl(224, 63%, 33%)
HSV	hsv(224, 77%, 53%)
CMYK	cmyk(77%, 57%, 0%, 47.1%)
CIE-LAB	lab(26.92, 18.93, -46.06)
CIE-LCH	lch(26.92, 49.80, 292.35°)
OKLab	oklab(37.69% -0.0101 -0.1328)
OKLCH	oklch(37.69% 0.133 265.7)
XYZ	xyz(6.4498, 5.0660, 23.5549)
Luminance	0.0507 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3A87 #876C1F

analogous

#1F6E87 #1F3A87 #381F87

triadic

#1F3A87 #871F3A #3A871F

tetradic

#1F3A87 #871F6E #876C1F #1F8738

square

#1F3A87 #871F6E #876C1F #1F8738

split-complementary

#1F3A87 #87381F #6E871F

monochromatic

#080F23 #142555 #1F3A87 #2A4FB9 #4B6FD6

Accessibility & contrast

On white

10.43

#1F3A87 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1F3A87 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3A87

10.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3A87	#FFFFFF	#000000	##FFFFFF
##1F3A87	1.00	10.43	2.01	10.43
#FFFFFF	10.43	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458A

Deuteranopia (green-blind)

#003B85

Tritanopia (blue-blind)

#004D5A

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f3a87;
/* rgb */ color: rgb(31, 58, 135);
/* oklch */ color: oklch(37.7% 0.133 265.7);

Tailwind

colors: {
  custom: {
    50: '#6b6fab',
    500: '#1f3a87',
    950: '#000000',
  },
}

SCSS

$custom: #1f3a87;
$custom-light: #6b6fab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3a87",
  "rgb": {
    "r": 31,
    "g": 58,
    "b": 135
  },
  "hsl": {
    "h": 224.423,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.37693,
    "c": 0.13316,
    "h": 265.7
  },
  "luminance": 0.05067
}

Semantic roles & 50–950 ramp

primary

#1F3A87

secondary

#B89B4A

accent

#BB42E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3A87

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

Preview Lab → · Contrast checker → · Palette generator →