#1B3FA0#1B3FA0

#1B3FA0 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.8% C 0.163 H 264.5°. Best body text is #FFFFFF at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#1B3FA0
RGB	rgb(27, 63, 160)
HSL	hsl(224, 71%, 37%)
HSV	hsv(224, 83%, 63%)
CMYK	cmyk(83.1%, 60.6%, 0%, 37.3%)
CIE-LAB	lab(30.22, 25.01, -56.03)
CIE-LCH	lch(30.22, 61.36, 294.06°)
OKLab	oklab(40.77% -0.0155 -0.162)
OKLCH	oklch(40.77% 0.163 264.5)
XYZ	xyz(8.5724, 6.3251, 34.0199)
Luminance	0.0633 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3FA0 #A07C1B

analogous

#1B82A0 #1B3FA0 #391BA0

triadic

#1B3FA0 #A01B3F #3FA01B

tetradic

#1B3FA0 #A01B82 #A07C1B #1BA039

square

#1B3FA0 #A01B82 #A07C1B #1BA039

split-complementary

#1B3FA0 #A0391B #82A01B

monochromatic

#091637 #122A6C #1B3FA0 #2454D4 #537AE2

Accessibility & contrast

On white

9.27

#1B3FA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#1B3FA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3FA0

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3FA0	#FFFFFF	#000000	##FFFFFF
##1B3FA0	1.00	9.27	2.27	9.27
#FFFFFF	9.27	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA3

Deuteranopia (green-blind)

#00419E

Tritanopia (blue-blind)

#005869

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1b3fa0;
/* rgb */ color: rgb(27, 63, 160);
/* oklch */ color: oklch(40.8% 0.163 264.5);

Tailwind

colors: {
  custom: {
    50: '#7073bd',
    500: '#1b3fa0',
    950: '#000000',
  },
}

SCSS

$custom: #1b3fa0;
$custom-light: #7073bd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3fa0",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 160
  },
  "hsl": {
    "h": 223.759,
    "s": 71.123,
    "l": 36.667
  },
  "oklch": {
    "l": 0.40769,
    "c": 0.16279,
    "h": 264.5
  },
  "luminance": 0.06326
}

Semantic roles & 50–950 ramp

primary

#1B3FA0

secondary

#C5A652

accent

#BD3AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3FA0

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

Preview Lab → · Contrast checker → · Palette generator →