#1B3D8F#1B3D8F

#1B3D8F is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.9% C 0.142 H 263.9°. Best body text is #FFFFFF at 9.95:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D8F
RGB	rgb(27, 61, 143)
HSL	hsl(222, 68%, 33%)
HSV	hsv(222, 81%, 56%)
CMYK	cmyk(81.1%, 57.3%, 0%, 43.9%)
CIE-LAB	lab(28.25, 19.59, -48.85)
CIE-LCH	lch(28.25, 52.63, 291.86°)
OKLab	oklab(38.86% -0.015 -0.141)
OKLCH	oklch(38.86% 0.142 263.9)
XYZ	xyz(7.0769, 5.5528, 26.6801)
Luminance	0.0555 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D8F #8F6D1B

analogous

#1B778F #1B3D8F #331B8F

triadic

#1B3D8F #8F1B3D #3D8F1B

tetradic

#1B3D8F #8F1B77 #8F6D1B #1B8F33

square

#1B3D8F #8F1B77 #8F6D1B #1B8F33

split-complementary

#1B3D8F #8F331B #778F1B

monochromatic

#081128 #11275C #1B3D8F #2553C2 #4873DC

Accessibility & contrast

On white

9.95

#1B3D8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#1B3D8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D8F

9.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D8F	#FFFFFF	#000000	##FFFFFF
##1B3D8F	1.00	9.95	2.11	9.95
#FFFFFF	9.95	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003E8D

Tritanopia (blue-blind)

#005160

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b3d8f;
/* rgb */ color: rgb(27, 61, 143);
/* oklch */ color: oklch(38.9% 0.142 263.9);

Tailwind

colors: {
  custom: {
    50: '#6c72b0',
    500: '#1b3d8f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d8f;
$custom-light: #6c72b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d8f",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 143
  },
  "hsl": {
    "h": 222.414,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.38855,
    "c": 0.14181,
    "h": 263.9
  },
  "luminance": 0.05554
}

Semantic roles & 50–950 ramp

primary

#1B3D8F

secondary

#BE9B48

accent

#B83DEB

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B3D8F

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

Preview Lab → · Contrast checker → · Palette generator →