#1F3689#1F3689

#1F3689 is a dark, vivid blue. Relative luminance 0.047; OKLCH L 37.0% C 0.141 H 267.2°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#1F3689
RGB	rgb(31, 54, 137)
HSL	hsl(227, 63%, 33%)
HSV	hsv(227, 77%, 54%)
CMYK	cmyk(77.4%, 60.6%, 0%, 46.3%)
CIE-LAB	lab(25.97, 22.50, -48.86)
CIE-LCH	lch(25.97, 53.79, 294.73°)
OKLab	oklab(37.03% -0.0069 -0.1411)
OKLCH	oklch(37.03% 0.141 267.2)
XYZ	xyz(6.3980, 4.7351, 24.2388)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3689 #89721F

analogous

#1F6B89 #1F3689 #3D1F89

triadic

#1F3689 #891F36 #36891F

tetradic

#1F3689 #891F6B #89721F #1F893D

square

#1F3689 #891F6B #89721F #1F893D

split-complementary

#1F3689 #893D1F #6B891F

monochromatic

#080F25 #142257 #1F3689 #2A4ABB #4C6AD6

Accessibility & contrast

On white

10.78

#1F3689 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1F3689 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3689

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3689	#FFFFFF	#000000	##FFFFFF
##1F3689	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438C

Deuteranopia (green-blind)

#003987

Tritanopia (blue-blind)

#004B5A

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1f3689;
/* rgb */ color: rgb(31, 54, 137);
/* oklch */ color: oklch(37.0% 0.141 267.2);

Tailwind

colors: {
  custom: {
    50: '#6c6cac',
    500: '#1f3689',
    950: '#000000',
  },
}

SCSS

$custom: #1f3689;
$custom-light: #6c6cac;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3689",
  "rgb": {
    "r": 31,
    "g": 54,
    "b": 137
  },
  "hsl": {
    "h": 226.981,
    "s": 63.095,
    "l": 32.941
  },
  "oklch": {
    "l": 0.37028,
    "c": 0.14124,
    "h": 267.2
  },
  "luminance": 0.04736
}

Semantic roles & 50–950 ramp

primary

#1F3689

secondary

#B9A14B

accent

#C242E6

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F3689

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

Preview Lab → · Contrast checker → · Palette generator →