#1B1561#1B1561

#1B1561 is a dark, vivid blue. Relative luminance 0.016; OKLCH L 26.6% C 0.127 H 276.8°. Best body text is #FFFFFF at 15.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B1561
RGB	rgb(27, 21, 97)
HSL	hsl(245, 64%, 23%)
HSV	hsv(245, 78%, 38%)
CMYK	cmyk(72.2%, 78.4%, 0%, 62%)
CIE-LAB	lab(13.43, 29.00, -43.72)
CIE-LCH	lch(13.43, 52.47, 303.55°)
OKLab	oklab(26.62% 0.0152 -0.1263)
OKLCH	oklch(26.62% 0.127 276.8)
XYZ	xyz(2.8771, 1.6322, 11.4704)
Luminance	0.0163 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1561 #5B6115

analogous

#153561 #1B1561 #411561

triadic

#1B1561 #611B15 #15611B

tetradic

#1B1561 #611535 #5B6115 #156141

square

#1B1561 #611535 #5B6115 #156141

split-complementary

#1B1561 #614115 #356115

monochromatic

#070519 #0D0A2F #1B1561 #292093 #372BC6

Accessibility & contrast

On white

15.83

#1B1561 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#1B1561 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1561

15.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1561	#FFFFFF	#000000	##FFFFFF
##1B1561	1.00	15.83	1.33	15.83
#FFFFFF	15.83	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002663

Deuteranopia (green-blind)

#001F60

Tritanopia (blue-blind)

#002B39

Achromatopsia (no color)

#222222

Design tokens & code

CSS

--color: #1b1561;
/* rgb */ color: rgb(27, 21, 97);
/* oklch */ color: oklch(26.6% 0.127 276.8);

Tailwind

colors: {
  custom: {
    50: '#63538f',
    500: '#1b1561',
    950: '#000000',
  },
}

SCSS

$custom: #1b1561;
$custom-light: #63538f;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1561",
  "rgb": {
    "r": 27,
    "g": 21,
    "b": 97
  },
  "hsl": {
    "h": 244.737,
    "s": 64.407,
    "l": 23.137
  },
  "oklch": {
    "l": 0.26617,
    "c": 0.12724,
    "h": 276.8
  },
  "luminance": 0.01632
}

Semantic roles & 50–950 ramp

primary

#1B1561

secondary

#91983A

accent

#E740DA

background

#F6F4F8

surface

#EBE7F0

border

#C6C3CB

text

#06020C

muted

#7A787D

Preview Lab

Preview with #1B1561

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

Preview Lab → · Contrast checker → · Palette generator →