#1F3687#1F3687

#1F3687 is a dark, vivid blue. Relative luminance 0.047; OKLCH L 36.8% C 0.138 H 267.1°. Best body text is #FFFFFF at 10.85:1 contrast (WCAG AA passes).

Color values

HEX	#1F3687
RGB	rgb(31, 54, 135)
HSL	hsl(227, 63%, 33%)
HSV	hsv(227, 77%, 53%)
CMYK	cmyk(77%, 60%, 0%, 47.1%)
CIE-LAB	lab(25.80, 21.72, -47.89)
CIE-LCH	lch(25.80, 52.58, 294.39°)
OKLab	oklab(36.85% -0.007 -0.1382)
OKLCH	oklch(36.85% 0.138 267.1)
XYZ	xyz(6.2559, 4.6782, 23.4903)
Luminance	0.0468 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3687 #87701F

analogous

#1F6A87 #1F3687 #3C1F87

triadic

#1F3687 #871F36 #36871F

tetradic

#1F3687 #871F6A #87701F #1F873C

square

#1F3687 #871F6A #87701F #1F873C

split-complementary

#1F3687 #873C1F #6A871F

monochromatic

#080E23 #142255 #1F3687 #2A4AB9 #4B69D6

Accessibility & contrast

On white

10.85

#1F3687 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1F3687 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3687

10.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3687	#FFFFFF	#000000	##FFFFFF
##1F3687	1.00	10.85	1.94	10.85
#FFFFFF	10.85	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00428A

Deuteranopia (green-blind)

#003885

Tritanopia (blue-blind)

#004A59

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1f3687;
/* rgb */ color: rgb(31, 54, 135);
/* oklch */ color: oklch(36.8% 0.138 267.1);

Tailwind

colors: {
  custom: {
    50: '#6b6cab',
    500: '#1f3687',
    950: '#000000',
  },
}

SCSS

$custom: #1f3687;
$custom-light: #6b6cab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3687",
  "rgb": {
    "r": 31,
    "g": 54,
    "b": 135
  },
  "hsl": {
    "h": 226.731,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36849,
    "c": 0.1384,
    "h": 267.1
  },
  "luminance": 0.04679
}

Semantic roles & 50–950 ramp

primary

#1F3687

secondary

#B8A04A

accent

#C242E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3687

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

Preview Lab → · Contrast checker → · Palette generator →