#1F3791#1F3791

#1F3791 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 38.0% C 0.151 H 267.1°. Best body text is #FFFFFF at 10.43:1 contrast (WCAG AA passes).

Color values

HEX	#1F3791
RGB	rgb(31, 55, 145)
HSL	hsl(227, 65%, 35%)
HSV	hsv(227, 79%, 57%)
CMYK	cmyk(78.6%, 62.1%, 0%, 43.1%)
CIE-LAB	lab(26.93, 24.96, -52.24)
CIE-LCH	lch(26.93, 57.90, 295.54°)
OKLab	oklab(37.96% -0.0075 -0.151)
OKLCH	oklch(37.96% 0.151 267.1)
XYZ	xyz(7.0403, 5.0672, 27.3896)
Luminance	0.0507 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3791 #91791F

analogous

#1F7091 #1F3791 #401F91

triadic

#1F3791 #911F37 #37911F

tetradic

#1F3791 #911F70 #91791F #1F9140

square

#1F3791 #911F70 #91791F #1F9140

split-complementary

#1F3791 #91401F #70911F

monochromatic

#09112C #14245F #1F3791 #2A4AC3 #516EDA

Accessibility & contrast

On white

10.43

#1F3791 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1F3791 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3791

10.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3791	#FFFFFF	#000000	##FFFFFF
##1F3791	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)

#004594

Deuteranopia (green-blind)

#003A8F

Tritanopia (blue-blind)

#004E5E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f3791;
/* rgb */ color: rgb(31, 55, 145);
/* oklch */ color: oklch(38.0% 0.151 267.1);

Tailwind

colors: {
  custom: {
    50: '#6e6db2',
    500: '#1f3791',
    950: '#000000',
  },
}

SCSS

$custom: #1f3791;
$custom-light: #6e6db2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3791",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 145
  },
  "hsl": {
    "h": 227.368,
    "s": 64.773,
    "l": 34.51
  },
  "oklch": {
    "l": 0.37956,
    "c": 0.15118,
    "h": 267.1
  },
  "luminance": 0.05068
}

Semantic roles & 50–950 ramp

primary

#1F3791

secondary

#BDA64F

accent

#C440E8

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1F3791

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

Preview Lab → · Contrast checker → · Palette generator →