#1B1F8B#1B1F8B

#1B1F8B is a dark, vivid blue. Relative luminance 0.031; OKLCH L 32.9% C 0.172 H 270.6°. Best body text is #FFFFFF at 13.00:1 contrast (WCAG AA passes).

Color values

HEX	#1B1F8B
RGB	rgb(27, 31, 139)
HSL	hsl(238, 67%, 33%)
HSV	hsv(238, 81%, 55%)
CMYK	cmyk(80.6%, 77.7%, 0%, 45.5%)
CIE-LAB	lab(20.35, 37.90, -59.34)
CIE-LCH	lch(20.35, 70.41, 302.56°)
OKLab	oklab(32.94% 0.0017 -0.1718)
OKLCH	oklch(32.94% 0.172 270.6)
XYZ	xyz(5.6006, 3.0764, 24.7197)
Luminance	0.0308 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1F8B #8B871B

analogous

#1B578B #1B1F8B #4F1B8B

triadic

#1B1F8B #8B1B1F #1F8B1B

tetradic

#1B1F8B #8B1B57 #8B871B #1B8B4F

square

#1B1F8B #8B1B57 #8B871B #1B8B4F

split-complementary

#1B1F8B #8B4F1B #578B1B

monochromatic

#070825 #111458 #1B1F8B #252ABE #454BDB

Accessibility & contrast

On white

13.00

#1B1F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.62

#1B1F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1F8B

13.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1F8B	#FFFFFF	#000000	##FFFFFF
##1B1F8B	1.00	13.00	1.62	13.00
#FFFFFF	13.00	1.00	21.00	1.00
#000000	1.62	21.00	1.00	21.00
##FFFFFF	13.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00378E

Deuteranopia (green-blind)

#002B89

Tritanopia (blue-blind)

#003F54

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b1f8b;
/* rgb */ color: rgb(27, 31, 139);
/* oklch */ color: oklch(32.9% 0.172 270.6);

Tailwind

colors: {
  custom: {
    50: '#6d5cae',
    500: '#1b1f8b',
    950: '#000000',
  },
}

SCSS

$custom: #1b1f8b;
$custom-light: #6d5cae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1f8b",
  "rgb": {
    "r": 27,
    "g": 31,
    "b": 139
  },
  "hsl": {
    "h": 237.857,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.32941,
    "c": 0.17186,
    "h": 270.6
  },
  "luminance": 0.03077
}

Semantic roles & 50–950 ramp

primary

#1B1F8B

secondary

#BCB845

accent

#E43DEA

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B1F8B

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

Preview Lab → · Contrast checker → · Palette generator →