#1F40AB#1F40AB

#1F40AB is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.1% C 0.175 H 265.7°. Best body text is #FFFFFF at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#1F40AB
RGB	rgb(31, 64, 171)
HSL	hsl(226, 69%, 40%)
HSV	hsv(226, 82%, 67%)
CMYK	cmyk(81.9%, 62.6%, 0%, 32.9%)
CIE-LAB	lab(31.57, 28.98, -60.42)
CIE-LCH	lch(31.57, 67.02, 295.62°)
OKLab	oklab(42.11% -0.013 -0.1749)
OKLCH	oklch(42.11% 0.175 265.7)
XYZ	xyz(9.7466, 6.8972, 39.3378)
Luminance	0.0690 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F40AB #AB8A1F

analogous

#1F86AB #1F40AB #441FAB

triadic

#1F40AB #AB1F40 #40AB1F

tetradic

#1F40AB #AB1F86 #AB8A1F #1FAB44

square

#1F40AB #AB1F86 #AB8A1F #1FAB44

split-complementary

#1F40AB #AB441F #86AB1F

monochromatic

#0C1943 #162D77 #1F40AB #2E56D9 #6280E3

Accessibility & contrast

On white

8.83

#1F40AB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#1F40AB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F40AB

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F40AB	#FFFFFF	#000000	##FFFFFF
##1F40AB	1.00	8.83	2.38	8.83
#FFFFFF	8.83	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AE

Deuteranopia (green-blind)

#0044A9

Tritanopia (blue-blind)

#005C6F

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #1f40ab;
/* rgb */ color: rgb(31, 64, 171);
/* oklch */ color: oklch(42.1% 0.175 265.7);

Tailwind

colors: {
  custom: {
    50: '#7474c5',
    500: '#1f40ab',
    950: '#000000',
  },
}

SCSS

$custom: #1f40ab;
$custom-light: #7474c5;
$custom-dark: #000000;

JSON

{
  "hex": "#1f40ab",
  "rgb": {
    "r": 31,
    "g": 64,
    "b": 171
  },
  "hsl": {
    "h": 225.857,
    "s": 69.307,
    "l": 39.608
  },
  "oklch": {
    "l": 0.42109,
    "c": 0.17534,
    "h": 265.7
  },
  "luminance": 0.06898
}

Semantic roles & 50–950 ramp

primary

#1F40AB

secondary

#C7AF5E

accent

#C33CEC

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F40AB

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

Preview Lab → · Contrast checker → · Palette generator →