#1B2378#1B2378

#1B2378 is a dark, vivid blue. Relative luminance 0.028; OKLCH L 31.5% C 0.142 H 271.0°. Best body text is #FFFFFF at 13.48:1 contrast (WCAG AA passes).

Color values

HEX	#1B2378
RGB	rgb(27, 35, 120)
HSL	hsl(235, 63%, 29%)
HSV	hsv(235, 78%, 47%)
CMYK	cmyk(77.5%, 70.8%, 0%, 52.9%)
CIE-LAB	lab(19.19, 28.44, -49.24)
CIE-LCH	lch(19.19, 56.87, 300.01°)
OKLab	oklab(31.49% 0.0026 -0.1425)
OKLCH	oklch(31.49% 0.142 271)
XYZ	xyz(4.4420, 2.7907, 18.0702)
Luminance	0.0279 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2378 #78701B

analogous

#1B5278 #1B2378 #421B78

triadic

#1B2378 #781B23 #23781B

tetradic

#1B2378 #781B52 #78701B #1B7842

square

#1B2378 #781B52 #78701B #1B7842

split-complementary

#1B2378 #78421B #52781B

monochromatic

#060719 #101446 #1B2378 #2632AA #3B48D3

Accessibility & contrast

On white

13.48

#1B2378 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#1B2378 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2378

13.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2378	#FFFFFF	#000000	##FFFFFF
##1B2378	1.00	13.48	1.56	13.48
#FFFFFF	13.48	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00337B

Deuteranopia (green-blind)

#002A76

Tritanopia (blue-blind)

#003A4A

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b2378;
/* rgb */ color: rgb(27, 35, 120);
/* oklch */ color: oklch(31.5% 0.142 271.0);

Tailwind

colors: {
  custom: {
    50: '#685ea0',
    500: '#1b2378',
    950: '#000000',
  },
}

SCSS

$custom: #1b2378;
$custom-light: #685ea0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2378",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 120
  },
  "hsl": {
    "h": 234.839,
    "s": 63.265,
    "l": 28.824
  },
  "oklch": {
    "l": 0.31492,
    "c": 0.14249,
    "h": 271
  },
  "luminance": 0.02791
}

Semantic roles & 50–950 ramp

primary

#1B2378

secondary

#ACA343

accent

#D841E6

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040F

muted

#7A797E

Preview Lab

Preview with #1B2378

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

Preview Lab → · Contrast checker → · Palette generator →