#1B2579#1B2579

#1B2579 is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.0% C 0.141 H 270.5°. Best body text is #FFFFFF at 13.23:1 contrast (WCAG AA passes).

Color values

HEX	#1B2579
RGB	rgb(27, 37, 121)
HSL	hsl(234, 64%, 29%)
HSV	hsv(234, 78%, 47%)
CMYK	cmyk(77.7%, 69.4%, 0%, 52.5%)
CIE-LAB	lab(19.79, 27.48, -48.90)
CIE-LCH	lch(19.79, 56.09, 299.34°)
OKLab	oklab(31.96% 0.0012 -0.1414)
OKLCH	oklch(31.96% 0.141 270.5)
XYZ	xyz(4.5636, 2.9361, 18.4117)
Luminance	0.0294 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2579 #796F1B

analogous

#1B5479 #1B2579 #401B79

triadic

#1B2579 #791B25 #25791B

tetradic

#1B2579 #791B54 #796F1B #1B7940

square

#1B2579 #791B54 #796F1B #1B7940

split-complementary

#1B2579 #79401B #54791B

monochromatic

#060819 #101647 #1B2579 #2634AB #3B4BD3

Accessibility & contrast

On white

13.23

#1B2579 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#1B2579 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2579

13.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2579	#FFFFFF	#000000	##FFFFFF
##1B2579	1.00	13.23	1.59	13.23
#FFFFFF	13.23	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347C

Deuteranopia (green-blind)

#002B77

Tritanopia (blue-blind)

#003C4B

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b2579;
/* rgb */ color: rgb(27, 37, 121);
/* oklch */ color: oklch(32.0% 0.141 270.5);

Tailwind

colors: {
  custom: {
    50: '#685fa1',
    500: '#1b2579',
    950: '#000000',
  },
}

SCSS

$custom: #1b2579;
$custom-light: #685fa1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2579",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 121
  },
  "hsl": {
    "h": 233.617,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.3196,
    "c": 0.14146,
    "h": 270.5
  },
  "luminance": 0.02937
}

Semantic roles & 50–950 ramp

primary

#1B2579

secondary

#ADA243

accent

#D541E7

background

#F6F5FA

surface

#EBE9F3

border

#C6C5CD

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B2579

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

Preview Lab → · Contrast checker → · Palette generator →