#1B285A#1B285A

#1B285A is a dark, moderate blue. Relative luminance 0.025; OKLCH L 29.7% C 0.091 H 269.2°. Best body text is #FFFFFF at 14.02:1 contrast (WCAG AA passes).

Color values

HEX	#1B285A
RGB	rgb(27, 40, 90)
HSL	hsl(228, 54%, 23%)
HSV	hsv(228, 70%, 35%)
CMYK	cmyk(70%, 55.6%, 0%, 64.7%)
CIE-LAB	lab(17.87, 13.01, -31.82)
CIE-LCH	lch(17.87, 34.37, 292.24°)
OKLab	oklab(29.68% -0.0013 -0.0913)
OKLCH	oklch(29.68% 0.091 269.2)
XYZ	xyz(3.0556, 2.4885, 9.9902)
Luminance	0.0249 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B285A #5A4D1B

analogous

#1B475A #1B285A #2D1B5A

triadic

#1B285A #5A1B28 #285A1B

tetradic

#1B285A #5A1B47 #5A4D1B #1B5A2D

square

#1B285A #5A1B47 #5A4D1B #1B5A2D

split-complementary

#1B285A #5A2D1B #475A1B

monochromatic

#070A18 #0D132B #1B285A #293D89 #3752B8

Accessibility & contrast

On white

14.02

#1B285A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.50

#1B285A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B285A

14.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B285A	#FFFFFF	#000000	##FFFFFF
##1B285A	1.00	14.02	1.50	14.02
#FFFFFF	14.02	1.00	21.00	1.00
#000000	1.50	21.00	1.00	21.00
##FFFFFF	14.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A2F5C

Deuteranopia (green-blind)

#002959

Tritanopia (blue-blind)

#00343C

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #1b285a;
/* rgb */ color: rgb(27, 40, 90);
/* oklch */ color: oklch(29.7% 0.091 269.2);

Tailwind

colors: {
  custom: {
    50: '#5f6189',
    500: '#1b285a',
    950: '#000000',
  },
}

SCSS

$custom: #1b285a;
$custom-light: #5f6189;
$custom-dark: #000000;

JSON

{
  "hex": "#1b285a",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 90
  },
  "hsl": {
    "h": 227.619,
    "s": 53.846,
    "l": 22.941
  },
  "oklch": {
    "l": 0.29678,
    "c": 0.09128,
    "h": 269.2
  },
  "luminance": 0.02489
}

Semantic roles & 50–950 ramp

primary

#1B285A

secondary

#908041

accent

#BF4BDD

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05050B

muted

#79797C

Preview Lab

Preview with #1B285A

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

Preview Lab → · Contrast checker → · Palette generator →