#1B3F8F#1B3F8F

#1B3F8F is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.3% C 0.139 H 263.2°. Best body text is #FFFFFF at 9.75:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F8F
RGB	rgb(27, 63, 143)
HSL	hsl(221, 68%, 33%)
HSV	hsv(221, 81%, 56%)
CMYK	cmyk(81.1%, 55.9%, 0%, 43.9%)
CIE-LAB	lab(28.83, 18.21, -47.92)
CIE-LCH	lch(28.83, 51.27, 290.80°)
OKLab	oklab(39.29% -0.0165 -0.1383)
OKLCH	oklch(39.29% 0.139 263.2)
XYZ	xyz(7.1857, 5.7704, 26.7164)
Luminance	0.0577 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F8F #8F6B1B

analogous

#1B798F #1B3F8F #311B8F

triadic

#1B3F8F #8F1B3F #3F8F1B

tetradic

#1B3F8F #8F1B79 #8F6B1B #1B8F31

square

#1B3F8F #8F1B79 #8F6B1B #1B8F31

split-complementary

#1B3F8F #8F311B #798F1B

monochromatic

#081228 #11285C #1B3F8F #2556C2 #4876DC

Accessibility & contrast

On white

9.75

#1B3F8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#1B3F8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F8F

9.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F8F	#FFFFFF	#000000	##FFFFFF
##1B3F8F	1.00	9.75	2.15	9.75
#FFFFFF	9.75	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A92

Deuteranopia (green-blind)

#003F8D

Tritanopia (blue-blind)

#005360

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b3f8f;
/* rgb */ color: rgb(27, 63, 143);
/* oklch */ color: oklch(39.3% 0.139 263.2);

Tailwind

colors: {
  custom: {
    50: '#6b73b0',
    500: '#1b3f8f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f8f;
$custom-light: #6b73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f8f",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 143
  },
  "hsl": {
    "h": 221.379,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.39286,
    "c": 0.13923,
    "h": 263.2
  },
  "luminance": 0.05771
}

Semantic roles & 50–950 ramp

primary

#1B3F8F

secondary

#BE9948

accent

#B53DEB

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1B3F8F

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

Preview Lab → · Contrast checker → · Palette generator →