#1F2B81#1F2B81

#1F2B81 is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.1% C 0.144 H 270.4°. Best body text is #FFFFFF at 12.20:1 contrast (WCAG AA passes).

Color values

HEX	#1F2B81
RGB	rgb(31, 43, 129)
HSL	hsl(233, 61%, 31%)
HSV	hsv(233, 76%, 51%)
CMYK	cmyk(76%, 66.7%, 0%, 49.4%)
CIE-LAB	lab(22.31, 26.95, -49.82)
CIE-LCH	lch(22.31, 56.64, 298.41°)
OKLab	oklab(34.11% 0.001 -0.144)
OKLCH	oklch(34.11% 0.144 270.4)
XYZ	xyz(5.3900, 3.6035, 21.1761)
Luminance	0.0360 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F2B81 #81751F

analogous

#1F5C81 #1F2B81 #441F81

triadic

#1F2B81 #811F2B #2B811F

tetradic

#1F2B81 #811F5C #81751F #1F8144

square

#1F2B81 #811F5C #81751F #1F8144

split-complementary

#1F2B81 #81441F #5C811F

monochromatic

#070A1E #131B50 #1F2B81 #2B3BB2 #4759D3

Accessibility & contrast

On white

12.20

#1F2B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#1F2B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F2B81

12.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F2B81	#FFFFFF	#000000	##FFFFFF
##1F2B81	1.00	12.20	1.72	12.20
#FFFFFF	12.20	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A84

Deuteranopia (green-blind)

#00317F

Tritanopia (blue-blind)

#004252

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1f2b81;
/* rgb */ color: rgb(31, 43, 129);
/* oklch */ color: oklch(34.1% 0.144 270.4);

Tailwind

colors: {
  custom: {
    50: '#6b64a6',
    500: '#1f2b81',
    950: '#000000',
  },
}

SCSS

$custom: #1f2b81;
$custom-light: #6b64a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f2b81",
  "rgb": {
    "r": 31,
    "g": 43,
    "b": 129
  },
  "hsl": {
    "h": 232.653,
    "s": 61.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.34105,
    "c": 0.14401,
    "h": 270.4
  },
  "luminance": 0.03604
}

Semantic roles & 50–950 ramp

primary

#1F2B81

secondary

#B4A748

accent

#D143E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#08050F

muted

#7A7A7F

Preview Lab

Preview with #1F2B81

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

Preview Lab → · Contrast checker → · Palette generator →