#1B1571#1B1571

#1B1571 is a dark, vivid blue. Relative luminance 0.020; OKLCH L 28.5% C 0.148 H 274.4°. Best body text is #FFFFFF at 15.08:1 contrast (WCAG AA passes).

Color values

HEX	#1B1571
RGB	rgb(27, 21, 113)
HSL	hsl(244, 69%, 26%)
HSV	hsv(244, 81%, 44%)
CMYK	cmyk(76.1%, 81.4%, 0%, 55.7%)
CIE-LAB	lab(15.28, 34.62, -51.17)
CIE-LCH	lch(15.28, 61.78, 304.08°)
OKLab	oklab(28.48% 0.0113 -0.148)
OKLCH	oklch(28.48% 0.148 274.4)
XYZ	xyz(3.6998, 1.9612, 15.8032)
Luminance	0.0196 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1571 #6B7115

analogous

#153D71 #1B1571 #491571

triadic

#1B1571 #711B15 #15711B

tetradic

#1B1571 #71153D #6B7115 #157149

square

#1B1571 #71153D #6B7115 #157149

split-complementary

#1B1571 #714915 #3D7115

monochromatic

#06051A #0F0B3D #1B1571 #271FA5 #3529D7

Accessibility & contrast

On white

15.08

#1B1571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.39

#1B1571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1571

15.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1571	#FFFFFF	#000000	##FFFFFF
##1B1571	1.00	15.08	1.39	15.08
#FFFFFF	15.08	1.00	21.00	1.00
#000000	1.39	21.00	1.00	21.00
##FFFFFF	15.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002A74

Deuteranopia (green-blind)

#00226F

Tritanopia (blue-blind)

#003143

Achromatopsia (no color)

#262626

Design tokens & code

CSS

--color: #1b1571;
/* rgb */ color: rgb(27, 21, 113);
/* oklch */ color: oklch(28.5% 0.148 274.4);

Tailwind

colors: {
  custom: {
    50: '#67549b',
    500: '#1b1571',
    950: '#000000',
  },
}

SCSS

$custom: #1b1571;
$custom-light: #67549b;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1571",
  "rgb": {
    "r": 27,
    "g": 21,
    "b": 113
  },
  "hsl": {
    "h": 243.913,
    "s": 68.657,
    "l": 26.275
  },
  "oklch": {
    "l": 0.28477,
    "c": 0.14844,
    "h": 274.4
  },
  "luminance": 0.01962
}

Semantic roles & 50–950 ramp

primary

#1B1571

secondary

#A0A73B

accent

#EB3CE0

background

#F6F5F9

surface

#EBE8F2

border

#C6C4CC

text

#07030E

muted

#7A787E

Preview Lab

Preview with #1B1571

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

Preview Lab → · Contrast checker → · Palette generator →