#1B3FA1#1B3FA1

#1B3FA1 is a dark, vivid blue. Relative luminance 0.064; OKLCH L 40.9% C 0.164 H 264.6°. Best body text is #FFFFFF at 9.24:1 contrast (WCAG AA passes).

Color values

HEX	#1B3FA1
RGB	rgb(27, 63, 161)
HSL	hsl(224, 71%, 37%)
HSV	hsv(224, 83%, 63%)
CMYK	cmyk(83.2%, 60.9%, 0%, 36.9%)
CIE-LAB	lab(30.30, 25.41, -56.49)
CIE-LCH	lch(30.30, 61.94, 294.22°)
OKLab	oklab(40.86% -0.0154 -0.1634)
OKLCH	oklch(40.86% 0.164 264.6)
XYZ	xyz(8.6602, 6.3602, 34.4825)
Luminance	0.0636 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3FA1 #A17D1B

analogous

#1B82A1 #1B3FA1 #3A1BA1

triadic

#1B3FA1 #A11B3F #3FA11B

tetradic

#1B3FA1 #A11B82 #A17D1B #1BA13A

square

#1B3FA1 #A11B82 #A17D1B #1BA13A

split-complementary

#1B3FA1 #A13A1B #82A11B

monochromatic

#091638 #122A6D #1B3FA1 #2454D5 #547AE2

Accessibility & contrast

On white

9.24

#1B3FA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#1B3FA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3FA1

9.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3FA1	#FFFFFF	#000000	##FFFFFF
##1B3FA1	1.00	9.24	2.27	9.24
#FFFFFF	9.24	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA4

Deuteranopia (green-blind)

#00419F

Tritanopia (blue-blind)

#00586A

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1b3fa1;
/* rgb */ color: rgb(27, 63, 161);
/* oklch */ color: oklch(40.9% 0.164 264.6);

Tailwind

colors: {
  custom: {
    50: '#7073be',
    500: '#1b3fa1',
    950: '#000000',
  },
}

SCSS

$custom: #1b3fa1;
$custom-light: #7073be;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3fa1",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 161
  },
  "hsl": {
    "h": 223.881,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.40859,
    "c": 0.16414,
    "h": 264.6
  },
  "luminance": 0.06361
}

Semantic roles & 50–950 ramp

primary

#1B3FA1

secondary

#C5A652

accent

#BE3AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3FA1

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

Preview Lab → · Contrast checker → · Palette generator →