#1B428F#1B428F

#1B428F is a dark, vivid blue. Relative luminance 0.061; OKLCH L 39.9% C 0.135 H 262.1°. Best body text is #FFFFFF at 9.45:1 contrast (WCAG AA passes).

Color values

HEX	#1B428F
RGB	rgb(27, 66, 143)
HSL	hsl(220, 68%, 33%)
HSV	hsv(220, 81%, 56%)
CMYK	cmyk(81.1%, 53.8%, 0%, 43.9%)
CIE-LAB	lab(29.69, 16.13, -46.52)
CIE-LCH	lch(29.69, 49.23, 289.12°)
OKLab	oklab(39.94% -0.0187 -0.134)
OKLCH	oklch(39.94% 0.135 262.1)
XYZ	xyz(7.3563, 6.1117, 26.7732)
Luminance	0.0611 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B428F #8F681B

analogous

#1B7C8F #1B428F #2E1B8F

triadic

#1B428F #8F1B42 #428F1B

tetradic

#1B428F #8F1B7C #8F681B #1B8F2E

square

#1B428F #8F1B7C #8F681B #1B8F2E

split-complementary

#1B428F #8F2E1B #7C8F1B

monochromatic

#081228 #112A5C #1B428F #255AC2 #487ADC

Accessibility & contrast

On white

9.45

#1B428F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#1B428F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B428F

9.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B428F	#FFFFFF	#000000	##FFFFFF
##1B428F	1.00	9.45	2.22	9.45
#FFFFFF	9.45	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#094C92

Deuteranopia (green-blind)

#00418D

Tritanopia (blue-blind)

#005562

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b428f;
/* rgb */ color: rgb(27, 66, 143);
/* oklch */ color: oklch(39.9% 0.135 262.1);

Tailwind

colors: {
  custom: {
    50: '#6b75b0',
    500: '#1b428f',
    950: '#000000',
  },
}

SCSS

$custom: #1b428f;
$custom-light: #6b75b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b428f",
  "rgb": {
    "r": 27,
    "g": 66,
    "b": 143
  },
  "hsl": {
    "h": 219.828,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.39944,
    "c": 0.13535,
    "h": 262.1
  },
  "luminance": 0.06113
}

Semantic roles & 50–950 ramp

primary

#1B428F

secondary

#BE9648

accent

#B03DEB

background

#F6F7FA

surface

#ECEDF5

border

#C7C8CF

text

#080811

muted

#7A7B80

Preview Lab

Preview with #1B428F

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

Preview Lab → · Contrast checker → · Palette generator →