#1B3F8A#1B3F8A

#1B3F8A is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.9% C 0.132 H 262.6°. Best body text is #FFFFFF at 9.88:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F8A
RGB	rgb(27, 63, 138)
HSL	hsl(221, 67%, 32%)
HSV	hsv(221, 80%, 54%)
CMYK	cmyk(80.4%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(28.44, 16.18, -45.47)
CIE-LCH	lch(28.44, 48.26, 289.59°)
OKLab	oklab(38.87% -0.0169 -0.131)
OKLCH	oklch(38.87% 0.132 262.6)
XYZ	xyz(6.8153, 5.6222, 24.7658)
Luminance	0.0562 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F8A #8A661B

analogous

#1B768A #1B3F8A #2F1B8A

triadic

#1B3F8A #8A1B3F #3F8A1B

tetradic

#1B3F8A #8A1B76 #8A661B #1B8A2F

square

#1B3F8A #8A1B76 #8A661B #1B8A2F

split-complementary

#1B3F8A #8A2F1B #768A1B

monochromatic

#071024 #112857 #1B3F8A #2556BD #4575DB

Accessibility & contrast

On white

9.88

#1B3F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#1B3F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F8A

9.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F8A	#FFFFFF	#000000	##FFFFFF
##1B3F8A	1.00	9.88	2.12	9.88
#FFFFFF	9.88	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#06488D

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b3f8a;
/* rgb */ color: rgb(27, 63, 138);
/* oklch */ color: oklch(38.9% 0.132 262.6);

Tailwind

colors: {
  custom: {
    50: '#6a73ad',
    500: '#1b3f8a',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f8a;
$custom-light: #6a73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f8a",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 220.541,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.3887,
    "c": 0.13211,
    "h": 262.6
  },
  "luminance": 0.05623
}

Semantic roles & 50–950 ramp

primary

#1B3F8A

secondary

#BC9545

accent

#B23EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #1B3F8A

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

Preview Lab → · Contrast checker → · Palette generator →