#1B439B#1B439B

#1B439B is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.2% C 0.151 H 263.0°. Best body text is #FFFFFF at 9.04:1 contrast (WCAG AA passes).

Color values

HEX	#1B439B
RGB	rgb(27, 67, 155)
HSL	hsl(221, 70%, 36%)
HSV	hsv(221, 83%, 61%)
CMYK	cmyk(82.6%, 56.8%, 0%, 39.2%)
CIE-LAB	lab(30.91, 20.29, -51.87)
CIE-LCH	lch(30.91, 55.70, 291.36°)
OKLab	oklab(41.16% -0.0183 -0.1498)
OKLCH	oklch(41.16% 0.151 263)
XYZ	xyz(8.3734, 6.6129, 31.8391)
Luminance	0.0661 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B439B #9B731B

analogous

#1B839B #1B439B #331B9B

triadic

#1B439B #9B1B43 #439B1B

tetradic

#1B439B #9B1B83 #9B731B #1B9B33

square

#1B439B #9B1B83 #9B731B #1B9B33

split-complementary

#1B439B #9B331B #839B1B

monochromatic

#091633 #122C67 #1B439B #245ACF #507DE0

Accessibility & contrast

On white

9.04

#1B439B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#1B439B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B439B

9.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B439B	#FFFFFF	#000000	##FFFFFF
##1B439B	1.00	9.04	2.32	9.04
#FFFFFF	9.04	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004F9E

Deuteranopia (green-blind)

#004399

Tritanopia (blue-blind)

#005968

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1b439b;
/* rgb */ color: rgb(27, 67, 155);
/* oklch */ color: oklch(41.2% 0.151 263.0);

Tailwind

colors: {
  custom: {
    50: '#6e76b9',
    500: '#1b439b',
    950: '#000000',
  },
}

SCSS

$custom: #1b439b;
$custom-light: #6e76b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b439b",
  "rgb": {
    "r": 27,
    "g": 67,
    "b": 155
  },
  "hsl": {
    "h": 221.25,
    "s": 70.33,
    "l": 35.686
  },
  "oklch": {
    "l": 0.41159,
    "c": 0.15089,
    "h": 263
  },
  "luminance": 0.06614
}

Semantic roles & 50–950 ramp

primary

#1B439B

secondary

#C39F4F

accent

#B53BED

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#080812

muted

#7B7B81

Preview Lab

Preview with #1B439B

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

Preview Lab → · Contrast checker → · Palette generator →