#1B3A8F#1B3A8F

#1B3A8F is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.2% C 0.146 H 264.9°. Best body text is #FFFFFF at 10.25:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A8F
RGB	rgb(27, 58, 143)
HSL	hsl(224, 68%, 33%)
HSV	hsv(224, 81%, 56%)
CMYK	cmyk(81.1%, 59.4%, 0%, 43.9%)
CIE-LAB	lab(27.41, 21.67, -50.22)
CIE-LCH	lch(27.41, 54.70, 293.34°)
OKLab	oklab(38.22% -0.0129 -0.1451)
OKLCH	oklch(38.22% 0.146 264.9)
XYZ	xyz(6.9212, 5.2415, 26.6282)
Luminance	0.0524 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A8F #8F701B

analogous

#1B748F #1B3A8F #361B8F

triadic

#1B3A8F #8F1B3A #3A8F1B

tetradic

#1B3A8F #8F1B74 #8F701B #1B8F36

square

#1B3A8F #8F1B74 #8F701B #1B8F36

split-complementary

#1B3A8F #8F361B #748F1B

monochromatic

#081028 #11255C #1B3A8F #254FC2 #4870DC

Accessibility & contrast

On white

10.25

#1B3A8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#1B3A8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A8F

10.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A8F	#FFFFFF	#000000	##FFFFFF
##1B3A8F	1.00	10.25	2.05	10.25
#FFFFFF	10.25	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004692

Deuteranopia (green-blind)

#003C8D

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3a8f;
/* rgb */ color: rgb(27, 58, 143);
/* oklch */ color: oklch(38.2% 0.146 264.9);

Tailwind

colors: {
  custom: {
    50: '#6c6fb1',
    500: '#1b3a8f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a8f;
$custom-light: #6c6fb1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a8f",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 143
  },
  "hsl": {
    "h": 223.966,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.38221,
    "c": 0.14567,
    "h": 264.9
  },
  "luminance": 0.05242
}

Semantic roles & 50–950 ramp

primary

#1B3A8F

secondary

#BE9E48

accent

#BC3DEB

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B3A8F

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

Preview Lab → · Contrast checker → · Palette generator →