#1B3F85#1B3F85

#1B3F85 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.5% C 0.125 H 261.9°. Best body text is #FFFFFF at 10.02:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F85
RGB	rgb(27, 63, 133)
HSL	hsl(220, 66%, 31%)
HSV	hsv(220, 80%, 52%)
CMYK	cmyk(79.7%, 52.6%, 0%, 47.8%)
CIE-LAB	lab(28.06, 14.14, -42.97)
CIE-LCH	lch(28.06, 45.24, 288.21°)
OKLab	oklab(38.46% -0.0175 -0.1237)
OKLCH	oklch(38.46% 0.125 261.9)
XYZ	xyz(6.4616, 5.4807, 22.9031)
Luminance	0.0548 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F85 #85611B

analogous

#1B7485 #1B3F85 #2C1B85

triadic

#1B3F85 #851B3F #3F851B

tetradic

#1B3F85 #851B74 #85611B #1B852C

square

#1B3F85 #851B74 #85611B #1B852C

split-complementary

#1B3F85 #852C1B #74851B

monochromatic

#060F1F #112752 #1B3F85 #2557B8 #4275D9

Accessibility & contrast

On white

10.02

#1B3F85 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#1B3F85 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F85

10.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F85	#FFFFFF	#000000	##FFFFFF
##1B3F85	1.00	10.02	2.10	10.02
#FFFFFF	10.02	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#124788

Deuteranopia (green-blind)

#003E84

Tritanopia (blue-blind)

#00505B

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1b3f85;
/* rgb */ color: rgb(27, 63, 133);
/* oklch */ color: oklch(38.5% 0.125 261.9);

Tailwind

colors: {
  custom: {
    50: '#6973a9',
    500: '#1b3f85',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f85;
$custom-light: #6973a9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f85",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 133
  },
  "hsl": {
    "h": 219.623,
    "s": 66.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.38465,
    "c": 0.12493,
    "h": 261.9
  },
  "luminance": 0.05481
}

Semantic roles & 50–950 ramp

primary

#1B3F85

secondary

#B89144

accent

#AF3FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #1B3F85

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

Preview Lab → · Contrast checker → · Palette generator →