#1B3A8E#1B3A8E

#1B3A8E is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.1% C 0.144 H 264.8°. Best body text is #FFFFFF at 10.28:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A8E
RGB	rgb(27, 58, 142)
HSL	hsl(224, 68%, 33%)
HSV	hsv(224, 81%, 56%)
CMYK	cmyk(81%, 59.2%, 0%, 44.3%)
CIE-LAB	lab(27.33, 21.27, -49.74)
CIE-LCH	lch(27.33, 54.10, 293.15°)
OKLab	oklab(38.13% -0.013 -0.1437)
OKLCH	oklch(38.13% 0.144 264.8)
XYZ	xyz(6.8458, 5.2113, 26.2310)
Luminance	0.0521 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A8E #8E6F1B

analogous

#1B738E #1B3A8E #351B8E

triadic

#1B3A8E #8E1B3A #3A8E1B

tetradic

#1B3A8E #8E1B73 #8E6F1B #1B8E35

square

#1B3A8E #8E1B73 #8E6F1B #1B8E35

split-complementary

#1B3A8E #8E351B #738E1B

monochromatic

#071027 #11255B #1B3A8E #254FC1 #476FDC

Accessibility & contrast

On white

10.28

#1B3A8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1B3A8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A8E

10.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A8E	#FFFFFF	#000000	##FFFFFF
##1B3A8E	1.00	10.28	2.04	10.28
#FFFFFF	10.28	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004691

Deuteranopia (green-blind)

#003B8C

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3a8e;
/* rgb */ color: rgb(27, 58, 142);
/* oklch */ color: oklch(38.1% 0.144 264.8);

Tailwind

colors: {
  custom: {
    50: '#6b6fb0',
    500: '#1b3a8e',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a8e;
$custom-light: #6b6fb0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a8e",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 142
  },
  "hsl": {
    "h": 223.826,
    "s": 68.047,
    "l": 33.137
  },
  "oklch": {
    "l": 0.38132,
    "c": 0.14426,
    "h": 264.8
  },
  "luminance": 0.05212
}

Semantic roles & 50–950 ramp

primary

#1B3A8E

secondary

#BE9E47

accent

#BC3DEB

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1B3A8E

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

Preview Lab → · Contrast checker → · Palette generator →