#1F3FA1#1F3FA1

#1F3FA1 is a dark, vivid blue. Relative luminance 0.064; OKLCH L 41.0% C 0.163 H 265.6°. Best body text is #FFFFFF at 9.19:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FA1
RGB	rgb(31, 63, 161)
HSL	hsl(225, 68%, 38%)
HSV	hsv(225, 81%, 63%)
CMYK	cmyk(80.7%, 60.9%, 0%, 36.9%)
CIE-LAB	lab(30.44, 25.77, -56.26)
CIE-LCH	lch(30.44, 61.88, 294.62°)
OKLab	oklab(41% -0.0125 -0.1626)
OKLCH	oklch(41% 0.163 265.6)
XYZ	xyz(8.7733, 6.4185, 34.4878)
Luminance	0.0642 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FA1 #A1811F

analogous

#1F80A1 #1F3FA1 #401FA1

triadic

#1F3FA1 #A11F3F #3FA11F

tetradic

#1F3FA1 #A11F80 #A1811F #1FA140

square

#1F3FA1 #A11F80 #A1811F #1FA140

split-complementary

#1F3FA1 #A1401F #80A11F

monochromatic

#0B173A #152B6E #1F3FA1 #2953D4 #5B7CDF

Accessibility & contrast

On white

9.19

#1F3FA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#1F3FA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FA1

9.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FA1	#FFFFFF	#000000	##FFFFFF
##1F3FA1	1.00	9.19	2.28	9.19
#FFFFFF	9.19	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA4

Deuteranopia (green-blind)

#00429F

Tritanopia (blue-blind)

#00586A

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #1f3fa1;
/* rgb */ color: rgb(31, 63, 161);
/* oklch */ color: oklch(41.0% 0.163 265.6);

Tailwind

colors: {
  custom: {
    50: '#7173be',
    500: '#1f3fa1',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fa1;
$custom-light: #7173be;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fa1",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 161
  },
  "hsl": {
    "h": 225.231,
    "s": 67.708,
    "l": 37.647
  },
  "oklch": {
    "l": 0.41004,
    "c": 0.16313,
    "h": 265.6
  },
  "luminance": 0.0642
}

Semantic roles & 50–950 ramp

primary

#1F3FA1

secondary

#C4A958

accent

#C03DEB

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3FA1

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

Preview Lab → · Contrast checker → · Palette generator →