#1B4281#1B4281

#1B4281 is a dark, moderate blue. Relative luminance 0.057; OKLCH L 38.8% C 0.115 H 259.6°. Best body text is #FFFFFF at 9.80:1 contrast (WCAG AA passes).

Color values

HEX	#1B4281
RGB	rgb(27, 66, 129)
HSL	hsl(217, 65%, 31%)
HSV	hsv(217, 79%, 51%)
CMYK	cmyk(79.1%, 48.8%, 0%, 49.4%)
CIE-LAB	lab(28.68, 10.42, -39.49)
CIE-LCH	lch(28.68, 40.84, 284.79°)
OKLab	oklab(38.85% -0.0207 -0.1134)
OKLCH	oklch(38.85% 0.115 259.6)
XYZ	xyz(6.3612, 5.7137, 21.5322)
Luminance	0.0571 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4281 #815A1B

analogous

#1B7581 #1B4281 #271B81

triadic

#1B4281 #811B42 #42811B

tetradic

#1B4281 #811B75 #815A1B #1B8127

square

#1B4281 #811B75 #815A1B #1B8127

split-complementary

#1B4281 #81271B #75811B

monochromatic

#060E1C #10284E #1B4281 #265CB4 #3F79D7

Accessibility & contrast

On white

9.80

#1B4281 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1B4281 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4281

9.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4281	#FFFFFF	#000000	##FFFFFF
##1B4281	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)

#1F4983

Deuteranopia (green-blind)

#033F80

Tritanopia (blue-blind)

#00515B

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b4281;
/* rgb */ color: rgb(27, 66, 129);
/* oklch */ color: oklch(38.8% 0.115 259.6);

Tailwind

colors: {
  custom: {
    50: '#6875a6',
    500: '#1b4281',
    950: '#000000',
  },
}

SCSS

$custom: #1b4281;
$custom-light: #6875a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4281",
  "rgb": {
    "r": 27,
    "g": 66,
    "b": 129
  },
  "hsl": {
    "h": 217.059,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.38845,
    "c": 0.11525,
    "h": 259.6
  },
  "luminance": 0.05714
}

Semantic roles & 50–950 ramp

primary

#1B4281

secondary

#B58943

accent

#A83FE8

background

#F6F7FA

surface

#EBEDF4

border

#C6C8CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B4281

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

Preview Lab → · Contrast checker → · Palette generator →