#1B256C#1B256C

#1B256C is a dark, vivid blue. Relative luminance 0.026; OKLCH L 30.7% C 0.123 H 271.0°. Best body text is #FFFFFF at 13.75:1 contrast (WCAG AA passes).

Color values

HEX	#1B256C
RGB	rgb(27, 37, 108)
HSL	hsl(233, 60%, 26%)
HSV	hsv(233, 75%, 42%)
CMYK	cmyk(75%, 65.7%, 0%, 57.6%)
CIE-LAB	lab(18.53, 22.41, -42.57)
CIE-LCH	lch(18.53, 48.11, 297.76°)
OKLab	oklab(30.66% 0.0021 -0.1229)
OKLCH	oklch(30.66% 0.123 271)
XYZ	xyz(3.8194, 2.6385, 14.4924)
Luminance	0.0264 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B256C #6C621B

analogous

#1B4E6C #1B256C #3A1B6C

triadic

#1B256C #6C1B25 #256C1B

tetradic

#1B256C #6C1B4E #6C621B #1B6C3A

square

#1B256C #6C1B4E #6C621B #1B6C3A

split-complementary

#1B256C #6C3A1B #4E6C1B

monochromatic

#060818 #0F143B #1B256C #27369D #3548CC

Accessibility & contrast

On white

13.75

#1B256C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#1B256C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B256C

13.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B256C	#FFFFFF	#000000	##FFFFFF
##1B256C	1.00	13.75	1.53	13.75
#FFFFFF	13.75	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00316E

Deuteranopia (green-blind)

#00296B

Tritanopia (blue-blind)

#003744

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b256c;
/* rgb */ color: rgb(27, 37, 108);
/* oklch */ color: oklch(30.7% 0.123 271.0);

Tailwind

colors: {
  custom: {
    50: '#645f97',
    500: '#1b256c',
    950: '#000000',
  },
}

SCSS

$custom: #1b256c;
$custom-light: #645f97;
$custom-dark: #000000;

JSON

{
  "hex": "#1b256c",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 108
  },
  "hsl": {
    "h": 232.593,
    "s": 60,
    "l": 26.471
  },
  "oklch": {
    "l": 0.30658,
    "c": 0.12296,
    "h": 271
  },
  "luminance": 0.02639
}

Semantic roles & 50–950 ramp

primary

#1B256C

secondary

#A19542

accent

#D045E3

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#06040D

muted

#7A797E

Preview Lab

Preview with #1B256C

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

Preview Lab → · Contrast checker → · Palette generator →