#1B3F8E#1B3F8E

#1B3F8E is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.2% C 0.138 H 263.1°. Best body text is #FFFFFF at 9.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F8E
RGB	rgb(27, 63, 142)
HSL	hsl(221, 68%, 33%)
HSV	hsv(221, 81%, 56%)
CMYK	cmyk(81%, 55.6%, 0%, 44.3%)
CIE-LAB	lab(28.75, 17.80, -47.44)
CIE-LCH	lch(28.75, 50.67, 290.57°)
OKLab	oklab(39.2% -0.0165 -0.1368)
OKLCH	oklch(39.2% 0.138 263.1)
XYZ	xyz(7.1102, 5.7402, 26.3192)
Luminance	0.0574 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F8E #8E6A1B

analogous

#1B788E #1B3F8E #301B8E

triadic

#1B3F8E #8E1B3F #3F8E1B

tetradic

#1B3F8E #8E1B78 #8E6A1B #1B8E30

square

#1B3F8E #8E1B78 #8E6A1B #1B8E30

split-complementary

#1B3F8E #8E301B #788E1B

monochromatic

#071127 #11285B #1B3F8E #2556C1 #4776DC

Accessibility & contrast

On white

9.78

#1B3F8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#1B3F8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F8E

9.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F8E	#FFFFFF	#000000	##FFFFFF
##1B3F8E	1.00	9.78	2.15	9.78
#FFFFFF	9.78	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004991

Deuteranopia (green-blind)

#003F8C

Tritanopia (blue-blind)

#005260

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b3f8e;
/* rgb */ color: rgb(27, 63, 142);
/* oklch */ color: oklch(39.2% 0.138 263.1);

Tailwind

colors: {
  custom: {
    50: '#6b73b0',
    500: '#1b3f8e',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f8e;
$custom-light: #6b73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f8e",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 142
  },
  "hsl": {
    "h": 221.217,
    "s": 68.047,
    "l": 33.137
  },
  "oklch": {
    "l": 0.39202,
    "c": 0.13781,
    "h": 263.1
  },
  "luminance": 0.05741
}

Semantic roles & 50–950 ramp

primary

#1B3F8E

secondary

#BE9947

accent

#B43DEB

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1B3F8E

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

Preview Lab → · Contrast checker → · Palette generator →