#1B358B#1B358B

#1B358B is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.8% C 0.146 H 266.2°. Best body text is #FFFFFF at 10.89:1 contrast (WCAG AA passes).

Color values

HEX	#1B358B
RGB	rgb(27, 53, 139)
HSL	hsl(226, 67%, 33%)
HSV	hsv(226, 81%, 55%)
CMYK	cmyk(80.6%, 61.9%, 0%, 45.5%)
CIE-LAB	lab(25.69, 23.54, -50.56)
CIE-LCH	lch(25.69, 55.77, 294.97°)
OKLab	oklab(36.83% -0.0097 -0.1461)
OKLCH	oklch(36.83% 0.146 266.2)
XYZ	xyz(6.3837, 4.6426, 24.9808)
Luminance	0.0464 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B358B #8B711B

analogous

#1B6D8B #1B358B #391B8B

triadic

#1B358B #8B1B35 #358B1B

tetradic

#1B358B #8B1B6D #8B711B #1B8B39

square

#1B358B #8B1B6D #8B711B #1B8B39

split-complementary

#1B358B #8B391B #6D8B1B

monochromatic

#070E25 #112158 #1B358B #2549BE #4568DB

Accessibility & contrast

On white

10.89

#1B358B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#1B358B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B358B

10.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B358B	#FFFFFF	#000000	##FFFFFF
##1B358B	1.00	10.89	1.93	10.89
#FFFFFF	10.89	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00428E

Deuteranopia (green-blind)

#003889

Tritanopia (blue-blind)

#004B5A

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b358b;
/* rgb */ color: rgb(27, 53, 139);
/* oklch */ color: oklch(36.8% 0.146 266.2);

Tailwind

colors: {
  custom: {
    50: '#6b6bae',
    500: '#1b358b',
    950: '#000000',
  },
}

SCSS

$custom: #1b358b;
$custom-light: #6b6bae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b358b",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 139
  },
  "hsl": {
    "h": 226.071,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36828,
    "c": 0.14647,
    "h": 266.2
  },
  "luminance": 0.04643
}

Semantic roles & 50–950 ramp

primary

#1B358B

secondary

#BCA145

accent

#C23DEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1B358B

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

Preview Lab → · Contrast checker → · Palette generator →