#1B2178#1B2178

#1B2178 is a dark, vivid blue. Relative luminance 0.027; OKLCH L 31.1% C 0.145 H 271.5°. Best body text is #FFFFFF at 13.68:1 contrast (WCAG AA passes).

Color values

HEX	#1B2178
RGB	rgb(27, 33, 120)
HSL	hsl(236, 63%, 29%)
HSV	hsv(236, 78%, 47%)
CMYK	cmyk(77.5%, 72.5%, 0%, 52.9%)
CIE-LAB	lab(18.70, 29.77, -50.05)
CIE-LCH	lch(18.70, 58.23, 300.74°)
OKLab	oklab(31.14% 0.0037 -0.1448)
OKLCH	oklch(31.14% 0.145 271.5)
XYZ	xyz(4.3849, 2.6763, 18.0511)
Luminance	0.0268 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2178 #78721B

analogous

#1B5078 #1B2178 #441B78

triadic

#1B2178 #781B21 #21781B

tetradic

#1B2178 #781B50 #78721B #1B7844

square

#1B2178 #781B50 #78721B #1B7844

split-complementary

#1B2178 #78441B #50781B

monochromatic

#060719 #101346 #1B2178 #262FAA #3B44D3

Accessibility & contrast

On white

13.68

#1B2178 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1B2178 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2178

13.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2178	#FFFFFF	#000000	##FFFFFF
##1B2178	1.00	13.68	1.54	13.68
#FFFFFF	13.68	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00327B

Deuteranopia (green-blind)

#002976

Tritanopia (blue-blind)

#00394A

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b2178;
/* rgb */ color: rgb(27, 33, 120);
/* oklch */ color: oklch(31.1% 0.145 271.5);

Tailwind

colors: {
  custom: {
    50: '#685da0',
    500: '#1b2178',
    950: '#000000',
  },
}

SCSS

$custom: #1b2178;
$custom-light: #685da0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2178",
  "rgb": {
    "r": 27,
    "g": 33,
    "b": 120
  },
  "hsl": {
    "h": 236.129,
    "s": 63.265,
    "l": 28.824
  },
  "oklch": {
    "l": 0.3114,
    "c": 0.14486,
    "h": 271.5
  },
  "luminance": 0.02677
}

Semantic roles & 50–950 ramp

primary

#1B2178

secondary

#ACA543

accent

#DC41E6

background

#F6F5F9

surface

#ECE9F2

border

#C7C5CC

text

#07040F

muted

#7A797E

Preview Lab

Preview with #1B2178

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

Preview Lab → · Contrast checker → · Palette generator →