#1F3899#1F3899

#1F3899 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.9% C 0.161 H 267.1°. Best body text is #FFFFFF at 10.08:1 contrast (WCAG AA passes).

Color values

HEX	#1F3899
RGB	rgb(31, 56, 153)
HSL	hsl(228, 66%, 36%)
HSV	hsv(228, 80%, 60%)
CMYK	cmyk(79.7%, 63.4%, 0%, 40%)
CIE-LAB	lab(27.90, 27.40, -55.56)
CIE-LCH	lch(27.90, 61.95, 296.25°)
OKLab	oklab(38.89% -0.0082 -0.1607)
OKLCH	oklch(38.89% 0.161 267.1)
XYZ	xyz(7.7270, 5.4187, 30.7695)
Luminance	0.0542 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3899 #99801F

analogous

#1F7599 #1F3899 #431F99

triadic

#1F3899 #991F38 #38991F

tetradic

#1F3899 #991F75 #99801F #1F9943

square

#1F3899 #991F75 #99801F #1F9943

split-complementary

#1F3899 #99431F #75991F

monochromatic

#0A1333 #152566 #1F3899 #294BCC #5671DD

Accessibility & contrast

On white

10.08

#1F3899 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#1F3899 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3899

10.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3899	#FFFFFF	#000000	##FFFFFF
##1F3899	1.00	10.08	2.08	10.08
#FFFFFF	10.08	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00489C

Deuteranopia (green-blind)

#003C97

Tritanopia (blue-blind)

#005163

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f3899;
/* rgb */ color: rgb(31, 56, 153);
/* oklch */ color: oklch(38.9% 0.161 267.1);

Tailwind

colors: {
  custom: {
    50: '#706eb8',
    500: '#1f3899',
    950: '#000000',
  },
}

SCSS

$custom: #1f3899;
$custom-light: #706eb8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3899",
  "rgb": {
    "r": 31,
    "g": 56,
    "b": 153
  },
  "hsl": {
    "h": 227.705,
    "s": 66.304,
    "l": 36.078
  },
  "oklch": {
    "l": 0.38894,
    "c": 0.16092,
    "h": 267.1
  },
  "luminance": 0.0542
}

Semantic roles & 50–950 ramp

primary

#1F3899

secondary

#C0AA54

accent

#C63FE9

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #1F3899

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

Preview Lab → · Contrast checker → · Palette generator →