#1F3F99#1F3F99

#1F3F99 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.3% C 0.152 H 265.2°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F99
RGB	rgb(31, 63, 153)
HSL	hsl(224, 66%, 36%)
HSV	hsv(224, 80%, 60%)
CMYK	cmyk(79.7%, 58.8%, 0%, 40%)
CIE-LAB	lab(29.78, 22.63, -52.49)
CIE-LCH	lch(29.78, 57.16, 293.32°)
OKLab	oklab(40.29% -0.0128 -0.1516)
OKLCH	oklch(40.29% 0.152 265.2)
XYZ	xyz(8.0903, 6.1453, 30.8906)
Luminance	0.0615 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F99 #99791F

analogous

#1F7C99 #1F3F99 #3C1F99

triadic

#1F3F99 #991F3F #3F991F

tetradic

#1F3F99 #991F7C #99791F #1F993C

square

#1F3F99 #991F7C #99791F #1F993C

split-complementary

#1F3F99 #993C1F #7C991F

monochromatic

#0A1533 #152A66 #1F3F99 #2954CC #5679DD

Accessibility & contrast

On white

9.42

#1F3F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F3F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F99

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F99	#FFFFFF	#000000	##FFFFFF
##1F3F99	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9C

Deuteranopia (green-blind)

#004197

Tritanopia (blue-blind)

#005665

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f3f99;
/* rgb */ color: rgb(31, 63, 153);
/* oklch */ color: oklch(40.3% 0.152 265.2);

Tailwind

colors: {
  custom: {
    50: '#6f73b8',
    500: '#1f3f99',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f99;
$custom-light: #6f73b8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f99",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 224.262,
    "s": 66.304,
    "l": 36.078
  },
  "oklch": {
    "l": 0.40295,
    "c": 0.15215,
    "h": 265.2
  },
  "luminance": 0.06146
}

Semantic roles & 50–950 ramp

primary

#1F3F99

secondary

#C0A454

accent

#BC3FE9

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090811

muted

#7B7B80

Preview Lab

Preview with #1F3F99

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

Preview Lab → · Contrast checker → · Palette generator →