#1B256B#1B256B

#1B256B is a dark, vivid blue. Relative luminance 0.026; OKLCH L 30.6% C 0.121 H 271.0°. Best body text is #FFFFFF at 13.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B256B
RGB	rgb(27, 37, 107)
HSL	hsl(233, 60%, 26%)
HSV	hsv(233, 75%, 42%)
CMYK	cmyk(74.8%, 65.4%, 0%, 58%)
CIE-LAB	lab(18.44, 22.01, -42.08)
CIE-LCH	lch(18.44, 47.49, 297.62°)
OKLab	oklab(30.56% 0.0021 -0.1215)
OKLCH	oklch(30.56% 0.121 271)
XYZ	xyz(3.7665, 2.6173, 14.2138)
Luminance	0.0262 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B256B #6B611B

analogous

#1B4D6B #1B256B #391B6B

triadic

#1B256B #6B1B25 #256B1B

tetradic

#1B256B #6B1B4D #6B611B #1B6B39

square

#1B256B #6B1B4D #6B611B #1B6B39

split-complementary

#1B256B #6B391B #4D6B1B

monochromatic

#060818 #0F143A #1B256B #27369C #3547CC

Accessibility & contrast

On white

13.78

#1B256B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#1B256B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B256B

13.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B256B	#FFFFFF	#000000	##FFFFFF
##1B256B	1.00	13.78	1.52	13.78
#FFFFFF	13.78	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00316D

Deuteranopia (green-blind)

#00296A

Tritanopia (blue-blind)

#003744

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b256b;
/* rgb */ color: rgb(27, 37, 107);
/* oklch */ color: oklch(30.6% 0.121 271.0);

Tailwind

colors: {
  custom: {
    50: '#645f96',
    500: '#1b256b',
    950: '#000000',
  },
}

SCSS

$custom: #1b256b;
$custom-light: #645f96;
$custom-dark: #000000;

JSON

{
  "hex": "#1b256b",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 107
  },
  "hsl": {
    "h": 232.5,
    "s": 59.701,
    "l": 26.275
  },
  "oklch": {
    "l": 0.30561,
    "c": 0.12149,
    "h": 271
  },
  "luminance": 0.02618
}

Semantic roles & 50–950 ramp

primary

#1B256B

secondary

#A09442

accent

#CF45E3

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#06040D

muted

#7A797E

Preview Lab

Preview with #1B256B

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

Preview Lab → · Contrast checker → · Palette generator →