#1B1F79#1B1F79

#1B1F79 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 30.9% C 0.148 H 271.8°. Best body text is #FFFFFF at 13.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B1F79
RGB	rgb(27, 31, 121)
HSL	hsl(237, 64%, 29%)
HSV	hsv(237, 78%, 47%)
CMYK	cmyk(77.7%, 74.4%, 0%, 52.5%)
CIE-LAB	lab(18.33, 31.43, -51.29)
CIE-LCH	lch(18.33, 60.15, 301.50°)
OKLab	oklab(30.91% 0.0047 -0.1484)
OKLCH	oklch(30.91% 0.149 271.8)
XYZ	xyz(4.3920, 2.5930, 18.3545)
Luminance	0.0259 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1F79 #79751B

analogous

#1B4E79 #1B1F79 #461B79

triadic

#1B1F79 #791B1F #1F791B

tetradic

#1B1F79 #791B4E #79751B #1B7946

square

#1B1F79 #791B4E #79751B #1B7946

split-complementary

#1B1F79 #79461B #4E791B

monochromatic

#060619 #101247 #1B1F79 #262CAB #3B42D3

Accessibility & contrast

On white

13.83

#1B1F79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#1B1F79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1F79

13.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1F79	#FFFFFF	#000000	##FFFFFF
##1B1F79	1.00	13.83	1.52	13.83
#FFFFFF	13.83	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00317C

Deuteranopia (green-blind)

#002877

Tritanopia (blue-blind)

#00384A

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b1f79;
/* rgb */ color: rgb(27, 31, 121);
/* oklch */ color: oklch(30.9% 0.148 271.8);

Tailwind

colors: {
  custom: {
    50: '#685ba1',
    500: '#1b1f79',
    950: '#000000',
  },
}

SCSS

$custom: #1b1f79;
$custom-light: #685ba1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1f79",
  "rgb": {
    "r": 27,
    "g": 31,
    "b": 121
  },
  "hsl": {
    "h": 237.447,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.30911,
    "c": 0.1485,
    "h": 271.8
  },
  "luminance": 0.02593
}

Semantic roles & 50–950 ramp

primary

#1B1F79

secondary

#ADA943

accent

#E041E7

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B1F79

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

Preview Lab → · Contrast checker → · Palette generator →