#1F31A5#1F31A5

#1F31A5 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.8% C 0.185 H 268.4°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F31A5
RGB	rgb(31, 49, 165)
HSL	hsl(232, 68%, 38%)
HSV	hsv(232, 81%, 65%)
CMYK	cmyk(81.2%, 70.3%, 0%, 35.3%)
CIE-LAB	lab(27.31, 36.51, -63.82)
CIE-LCH	lch(27.31, 73.53, 299.77°)
OKLab	oklab(38.81% -0.0052 -0.1849)
OKLCH	oklch(38.81% 0.185 268.4)
XYZ	xyz(8.4526, 5.2036, 36.1489)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F31A5 #A5931F

analogous

#1F74A5 #1F31A5 #501FA5

triadic

#1F31A5 #A51F31 #31A51F

tetradic

#1F31A5 #A51F74 #A5931F #1FA550

square

#1F31A5 #A51F74 #A5931F #1FA550

split-complementary

#1F31A5 #A5501F #74A51F

monochromatic

#0C123E #152271 #1F31A5 #2A41D7 #5E6FE1

Accessibility & contrast

On white

10.29

#1F31A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1F31A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F31A5

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F31A5	#FFFFFF	#000000	##FFFFFF
##1F31A5	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047A9

Deuteranopia (green-blind)

#003AA3

Tritanopia (blue-blind)

#005167

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f31a5;
/* rgb */ color: rgb(31, 49, 165);
/* oklch */ color: oklch(38.8% 0.185 268.4);

Tailwind

colors: {
  custom: {
    50: '#7469c1',
    500: '#1f31a5',
    950: '#000000',
  },
}

SCSS

$custom: #1f31a5;
$custom-light: #7469c1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f31a5",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 165
  },
  "hsl": {
    "h": 231.94,
    "s": 68.367,
    "l": 38.431
  },
  "oklch": {
    "l": 0.38811,
    "c": 0.18496,
    "h": 268.4
  },
  "luminance": 0.05205
}

Semantic roles & 50–950 ramp

primary

#1F31A5

secondary

#C5B75B

accent

#D43DEB

background

#F7F6FC

surface

#EEEBF8

border

#C9C6D1

text

#0A0612

muted

#7C7A81

Preview Lab

Preview with #1F31A5

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

Preview Lab → · Contrast checker → · Palette generator →