#1B3F8D#1B3F8D

#1B3F8D is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.1% C 0.136 H 263.0°. Best body text is #FFFFFF at 9.80:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F8D
RGB	rgb(27, 63, 141)
HSL	hsl(221, 68%, 33%)
HSV	hsv(221, 81%, 55%)
CMYK	cmyk(80.9%, 55.3%, 0%, 44.7%)
CIE-LAB	lab(28.67, 17.40, -46.94)
CIE-LCH	lch(28.67, 50.06, 290.33°)
OKLab	oklab(39.12% -0.0166 -0.1354)
OKLCH	oklch(39.12% 0.136 263)
XYZ	xyz(7.0355, 5.7103, 25.9255)
Luminance	0.0571 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F8D #8D691B

analogous

#1B788D #1B3F8D #301B8D

triadic

#1B3F8D #8D1B3F #3F8D1B

tetradic

#1B3F8D #8D1B78 #8D691B #1B8D30

square

#1B3F8D #8D1B78 #8D691B #1B8D30

split-complementary

#1B3F8D #8D301B #788D1B

monochromatic

#071126 #11285A #1B3F8D #2556C0 #4776DC

Accessibility & contrast

On white

9.80

#1B3F8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1B3F8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F8D

9.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F8D	#FFFFFF	#000000	##FFFFFF
##1B3F8D	1.00	9.80	2.14	9.80
#FFFFFF	9.80	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004990

Deuteranopia (green-blind)

#003F8B

Tritanopia (blue-blind)

#00525F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b3f8d;
/* rgb */ color: rgb(27, 63, 141);
/* oklch */ color: oklch(39.1% 0.136 263.0);

Tailwind

colors: {
  custom: {
    50: '#6b73af',
    500: '#1b3f8d',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f8d;
$custom-light: #6b73af;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f8d",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 141
  },
  "hsl": {
    "h": 221.053,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.39118,
    "c": 0.13639,
    "h": 263
  },
  "luminance": 0.05711
}

Semantic roles & 50–950 ramp

primary

#1B3F8D

secondary

#BD9846

accent

#B43DEB

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1B3F8D

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

Preview Lab → · Contrast checker → · Palette generator →