#1B4B9B#1B4B9B

#1B4B9B is a dark, vivid blue. Relative luminance 0.076; OKLCH L 42.9% C 0.141 H 260.2°. Best body text is #FFFFFF at 8.31:1 contrast (WCAG AA passes).

Color values

HEX	#1B4B9B
RGB	rgb(27, 75, 155)
HSL	hsl(218, 70%, 36%)
HSV	hsv(218, 83%, 61%)
CMYK	cmyk(82.6%, 51.6%, 0%, 39.2%)
CIE-LAB	lab(33.20, 14.82, -48.15)
CIE-LCH	lch(33.20, 50.38, 287.11°)
OKLab	oklab(42.9% -0.024 -0.1387)
OKLCH	oklch(42.9% 0.141 260.2)
XYZ	xyz(8.8823, 7.6306, 32.0087)
Luminance	0.0763 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4B9B #9B6B1B

analogous

#1B8B9B #1B4B9B #2B1B9B

triadic

#1B4B9B #9B1B4B #4B9B1B

tetradic

#1B4B9B #9B1B8B #9B6B1B #1B9B2B

square

#1B4B9B #9B1B8B #9B6B1B #1B9B2B

split-complementary

#1B4B9B #9B2B1B #8B9B1B

monochromatic

#091933 #123267 #1B4B9B #2464CF #5086E0

Accessibility & contrast

On white

8.31

#1B4B9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.53

#1B4B9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4B9B

8.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4B9B	#FFFFFF	#000000	##FFFFFF
##1B4B9B	1.00	8.31	2.53	8.31
#FFFFFF	8.31	1.00	21.00	1.00
#000000	2.53	21.00	1.00	21.00
##FFFFFF	8.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#17549E

Deuteranopia (green-blind)

#004999

Tritanopia (blue-blind)

#005E6B

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #1b4b9b;
/* rgb */ color: rgb(27, 75, 155);
/* oklch */ color: oklch(42.9% 0.141 260.2);

Tailwind

colors: {
  custom: {
    50: '#6e7cb9',
    500: '#1b4b9b',
    950: '#000000',
  },
}

SCSS

$custom: #1b4b9b;
$custom-light: #6e7cb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4b9b",
  "rgb": {
    "r": 27,
    "g": 75,
    "b": 155
  },
  "hsl": {
    "h": 217.5,
    "s": 70.33,
    "l": 35.686
  },
  "oklch": {
    "l": 0.42901,
    "c": 0.14075,
    "h": 260.2
  },
  "luminance": 0.07632
}

Semantic roles & 50–950 ramp

primary

#1B4B9B

secondary

#C3974F

accent

#AA3BED

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#080911

muted

#7B7B80

Preview Lab

Preview with #1B4B9B

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

Preview Lab → · Contrast checker → · Palette generator →