#1B3C8B#1B3C8B

#1B3C8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.137 H 263.9°. Best body text is #FFFFFF at 10.17:1 contrast (WCAG AA passes).

Color values

HEX	#1B3C8B
RGB	rgb(27, 60, 139)
HSL	hsl(222, 67%, 33%)
HSV	hsv(222, 81%, 55%)
CMYK	cmyk(80.6%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(27.65, 18.67, -47.37)
CIE-LCH	lch(27.65, 50.91, 291.51°)
OKLab	oklab(38.3% -0.0146 -0.1367)
OKLCH	oklch(38.3% 0.137 263.9)
XYZ	xyz(6.7264, 5.3280, 25.0950)
Luminance	0.0533 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3C8B #8B6A1B

analogous

#1B748B #1B3C8B #321B8B

triadic

#1B3C8B #8B1B3C #3C8B1B

tetradic

#1B3C8B #8B1B74 #8B6A1B #1B8B32

square

#1B3C8B #8B1B74 #8B6A1B #1B8B32

split-complementary

#1B3C8B #8B321B #748B1B

monochromatic

#071025 #112658 #1B3C8B #2552BE #4571DB

Accessibility & contrast

On white

10.17

#1B3C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#1B3C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3C8B

10.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3C8B	#FFFFFF	#000000	##FFFFFF
##1B3C8B	1.00	10.17	2.07	10.17
#FFFFFF	10.17	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003C89

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3c8b;
/* rgb */ color: rgb(27, 60, 139);
/* oklch */ color: oklch(38.3% 0.137 263.9);

Tailwind

colors: {
  custom: {
    50: '#6b71ae',
    500: '#1b3c8b',
    950: '#000000',
  },
}

SCSS

$custom: #1b3c8b;
$custom-light: #6b71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3c8b",
  "rgb": {
    "r": 27,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 222.321,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38297,
    "c": 0.13744,
    "h": 263.9
  },
  "luminance": 0.05329
}

Semantic roles & 50–950 ramp

primary

#1B3C8B

secondary

#BC9945

accent

#B73DEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3C8B

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

Preview Lab → · Contrast checker → · Palette generator →