#1B4399#1B4399

#1B4399 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.0% C 0.148 H 262.8°. Best body text is #FFFFFF at 9.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B4399
RGB	rgb(27, 67, 153)
HSL	hsl(221, 70%, 35%)
HSV	hsv(221, 82%, 60%)
CMYK	cmyk(82.4%, 56.2%, 0%, 40%)
CIE-LAB	lab(30.75, 19.48, -50.91)
CIE-LCH	lch(30.75, 54.51, 290.94°)
OKLab	oklab(40.99% -0.0185 -0.147)
OKLCH	oklch(40.99% 0.148 262.8)
XYZ	xyz(8.2069, 6.5462, 30.9618)
Luminance	0.0655 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4399 #99711B

analogous

#1B8299 #1B4399 #321B99

triadic

#1B4399 #991B43 #43991B

tetradic

#1B4399 #991B82 #99711B #1B9932

square

#1B4399 #991B82 #99711B #1B9932

split-complementary

#1B4399 #99321B #82991B

monochromatic

#091531 #122C65 #1B4399 #245ACD #4F7DE0

Accessibility & contrast

On white

9.09

#1B4399 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#1B4399 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4399

9.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4399	#FFFFFF	#000000	##FFFFFF
##1B4399	1.00	9.09	2.31	9.09
#FFFFFF	9.09	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004E9C

Deuteranopia (green-blind)

#004397

Tritanopia (blue-blind)

#005867

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #1b4399;
/* rgb */ color: rgb(27, 67, 153);
/* oklch */ color: oklch(41.0% 0.148 262.8);

Tailwind

colors: {
  custom: {
    50: '#6e76b8',
    500: '#1b4399',
    950: '#000000',
  },
}

SCSS

$custom: #1b4399;
$custom-light: #6e76b8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4399",
  "rgb": {
    "r": 27,
    "g": 67,
    "b": 153
  },
  "hsl": {
    "h": 220.952,
    "s": 70,
    "l": 35.294
  },
  "oklch": {
    "l": 0.4099,
    "c": 0.14811,
    "h": 262.8
  },
  "luminance": 0.06547
}

Semantic roles & 50–950 ramp

primary

#1B4399

secondary

#C29D4E

accent

#B43BED

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1B4399

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

Preview Lab → · Contrast checker → · Palette generator →