#1B4B9F#1B4B9F

#1B4B9F is a dark, vivid blue. Relative luminance 0.078; OKLCH L 43.2% C 0.146 H 260.7°. Best body text is #FFFFFF at 8.22:1 contrast (WCAG AA passes).

Color values

HEX	#1B4B9F
RGB	rgb(27, 75, 159)
HSL	hsl(218, 71%, 36%)
HSV	hsv(218, 83%, 62%)
CMYK	cmyk(83%, 52.8%, 0%, 37.6%)
CIE-LAB	lab(33.49, 16.44, -50.10)
CIE-LCH	lch(33.49, 52.72, 288.17°)
OKLab	oklab(43.22% -0.0235 -0.1444)
OKLCH	oklch(43.22% 0.146 260.7)
XYZ	xyz(9.2238, 7.7672, 33.8073)
Luminance	0.0777 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4B9F #9F6F1B

analogous

#1B8D9F #1B4B9F #2D1B9F

triadic

#1B4B9F #9F1B4B #4B9F1B

tetradic

#1B4B9F #9F1B8D #9F6F1B #1B9F2D

square

#1B4B9F #9F1B8D #9F6F1B #1B9F2D

split-complementary

#1B4B9F #9F2D1B #8D9F1B

monochromatic

#091A36 #12326B #1B4B9F #2464D3 #5387E2

Accessibility & contrast

On white

8.22

#1B4B9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#1B4B9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4B9F

8.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4B9F	#FFFFFF	#000000	##FFFFFF
##1B4B9F	1.00	8.22	2.55	8.22
#FFFFFF	8.22	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F55A2

Deuteranopia (green-blind)

#00499D

Tritanopia (blue-blind)

#00606D

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #1b4b9f;
/* rgb */ color: rgb(27, 75, 159);
/* oklch */ color: oklch(43.2% 0.146 260.7);

Tailwind

colors: {
  custom: {
    50: '#6f7cbc',
    500: '#1b4b9f',
    950: '#000000',
  },
}

SCSS

$custom: #1b4b9f;
$custom-light: #6f7cbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4b9f",
  "rgb": {
    "r": 27,
    "g": 75,
    "b": 159
  },
  "hsl": {
    "h": 218.182,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.43217,
    "c": 0.1463,
    "h": 260.7
  },
  "luminance": 0.07768
}

Semantic roles & 50–950 ramp

primary

#1B4B9F

secondary

#C59B51

accent

#AC3AEE

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090912

muted

#7B7B81

Preview Lab

Preview with #1B4B9F

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

Preview Lab → · Contrast checker → · Palette generator →