#1B40A1#1B40A1

#1B40A1 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.1% C 0.163 H 264.3°. Best body text is #FFFFFF at 9.15:1 contrast (WCAG AA passes).

Color values

HEX	#1B40A1
RGB	rgb(27, 64, 161)
HSL	hsl(223, 71%, 37%)
HSV	hsv(223, 83%, 63%)
CMYK	cmyk(83.2%, 60.2%, 0%, 36.9%)
CIE-LAB	lab(30.57, 24.73, -56.05)
CIE-LCH	lch(30.57, 61.26, 293.81°)
OKLab	oklab(41.06% -0.016 -0.1621)
OKLCH	oklch(41.06% 0.163 264.3)
XYZ	xyz(8.7161, 6.4720, 34.5011)
Luminance	0.0647 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B40A1 #A17C1B

analogous

#1B83A1 #1B40A1 #391BA1

triadic

#1B40A1 #A11B40 #40A11B

tetradic

#1B40A1 #A11B83 #A17C1B #1BA139

square

#1B40A1 #A11B83 #A17C1B #1BA139

split-complementary

#1B40A1 #A1391B #83A11B

monochromatic

#091638 #122B6D #1B40A1 #2455D5 #547BE2

Accessibility & contrast

On white

9.15

#1B40A1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#1B40A1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B40A1

9.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B40A1	#FFFFFF	#000000	##FFFFFF
##1B40A1	1.00	9.15	2.29	9.15
#FFFFFF	9.15	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA4

Deuteranopia (green-blind)

#00429F

Tritanopia (blue-blind)

#00596A

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #1b40a1;
/* rgb */ color: rgb(27, 64, 161);
/* oklch */ color: oklch(41.1% 0.163 264.3);

Tailwind

colors: {
  custom: {
    50: '#7074be',
    500: '#1b40a1',
    950: '#000000',
  },
}

SCSS

$custom: #1b40a1;
$custom-light: #7074be;
$custom-dark: #000000;

JSON

{
  "hex": "#1b40a1",
  "rgb": {
    "r": 27,
    "g": 64,
    "b": 161
  },
  "hsl": {
    "h": 223.433,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.4106,
    "c": 0.16289,
    "h": 264.3
  },
  "luminance": 0.06473
}

Semantic roles & 50–950 ramp

primary

#1B40A1

secondary

#C5A652

accent

#BC3AEE

background

#F7F7FB

surface

#EDEDF7

border

#C8C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B40A1

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

Preview Lab → · Contrast checker → · Palette generator →