#1B3C81#1B3C81

#1B3C81 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.5% C 0.123 H 262.7°. Best body text is #FFFFFF at 10.45:1 contrast (WCAG AA passes).

Color values

HEX	#1B3C81
RGB	rgb(27, 60, 129)
HSL	hsl(221, 65%, 31%)
HSV	hsv(221, 79%, 51%)
CMYK	cmyk(79.1%, 53.5%, 0%, 49.4%)
CIE-LAB	lab(26.87, 14.60, -42.40)
CIE-LCH	lch(26.87, 44.85, 289.00°)
OKLab	oklab(37.46% -0.0156 -0.1221)
OKLCH	oklch(37.46% 0.123 262.7)
XYZ	xyz(6.0289, 5.0490, 21.4214)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3C81 #81601B

analogous

#1B6F81 #1B3C81 #2D1B81

triadic

#1B3C81 #811B3C #3C811B

tetradic

#1B3C81 #811B6F #81601B #1B812D

square

#1B3C81 #811B6F #81601B #1B812D

split-complementary

#1B3C81 #812D1B #6F811B

monochromatic

#060D1C #10244E #1B3C81 #2654B4 #3F70D7

Accessibility & contrast

On white

10.45

#1B3C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1B3C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3C81

10.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3C81	#FFFFFF	#000000	##FFFFFF
##1B3C81	1.00	10.45	2.01	10.45
#FFFFFF	10.45	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E4483

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D58

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3c81;
/* rgb */ color: rgb(27, 60, 129);
/* oklch */ color: oklch(37.5% 0.123 262.7);

Tailwind

colors: {
  custom: {
    50: '#6871a6',
    500: '#1b3c81',
    950: '#000000',
  },
}

SCSS

$custom: #1b3c81;
$custom-light: #6871a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3c81",
  "rgb": {
    "r": 27,
    "g": 60,
    "b": 129
  },
  "hsl": {
    "h": 220.588,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.37464,
    "c": 0.12305,
    "h": 262.7
  },
  "luminance": 0.0505
}

Semantic roles & 50–950 ramp

primary

#1B3C81

secondary

#B59043

accent

#B23FE8

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3C81

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

Preview Lab → · Contrast checker → · Palette generator →