#1B3FA8#1B3FA8

#1B3FA8 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.5% C 0.174 H 264.9°. Best body text is #FFFFFF at 9.04:1 contrast (WCAG AA passes).

Color values

HEX	#1B3FA8
RGB	rgb(27, 63, 168)
HSL	hsl(225, 72%, 38%)
HSV	hsv(225, 84%, 66%)
CMYK	cmyk(83.9%, 62.5%, 0%, 34.1%)
CIE-LAB	lab(30.91, 28.15, -59.71)
CIE-LCH	lch(30.91, 66.02, 295.24°)
OKLab	oklab(41.5% -0.0153 -0.1728)
OKLCH	oklch(41.5% 0.174 264.9)
XYZ	xyz(9.2949, 6.6140, 37.8249)
Luminance	0.0662 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3FA8 #A8841B

analogous

#1B85A8 #1B3FA8 #3D1BA8

triadic

#1B3FA8 #A81B3F #3FA81B

tetradic

#1B3FA8 #A81B85 #A8841B #1BA83D

square

#1B3FA8 #A81B85 #A8841B #1BA83D

split-complementary

#1B3FA8 #A83D1B #85A81B

monochromatic

#0A173F #132B73 #1B3FA8 #2453DC #597DE4

Accessibility & contrast

On white

9.04

#1B3FA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#1B3FA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3FA8

9.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3FA8	#FFFFFF	#000000	##FFFFFF
##1B3FA8	1.00	9.04	2.32	9.04
#FFFFFF	9.04	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FAB

Deuteranopia (green-blind)

#0042A6

Tritanopia (blue-blind)

#005A6D

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1b3fa8;
/* rgb */ color: rgb(27, 63, 168);
/* oklch */ color: oklch(41.5% 0.174 264.9);

Tailwind

colors: {
  custom: {
    50: '#7273c3',
    500: '#1b3fa8',
    950: '#000000',
  },
}

SCSS

$custom: #1b3fa8;
$custom-light: #7273c3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3fa8",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 168
  },
  "hsl": {
    "h": 224.681,
    "s": 72.308,
    "l": 38.235
  },
  "oklch": {
    "l": 0.415,
    "c": 0.17353,
    "h": 264.9
  },
  "luminance": 0.06615
}

Semantic roles & 50–950 ramp

primary

#1B3FA8

secondary

#C8AB57

accent

#C039EF

background

#F7F6FC

surface

#EEECF8

border

#C9C7D1

text

#090813

muted

#7B7B82

Preview Lab

Preview with #1B3FA8

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

Preview Lab → · Contrast checker → · Palette generator →