#1B45BB#1B45BB

#1B45BB is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.4% C 0.191 H 264.5°. Best body text is #FFFFFF at 8.03:1 contrast (WCAG AA passes).

Color values

HEX	#1B45BB
RGB	rgb(27, 69, 187)
HSL	hsl(224, 75%, 42%)
HSV	hsv(224, 86%, 73%)
CMYK	cmyk(85.6%, 63.1%, 0%, 26.7%)
CIE-LAB	lab(34.14, 31.51, -65.72)
CIE-LCH	lch(34.14, 72.88, 295.62°)
OKLab	oklab(44.41% -0.0183 -0.1903)
OKLCH	oklch(44.41% 0.191 264.5)
XYZ	xyz(11.5466, 8.0757, 47.9543)
Luminance	0.0808 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B45BB #BB911B

analogous

#1B95BB #1B45BB #411BBB

triadic

#1B45BB #BB1B45 #45BB1B

tetradic

#1B45BB #BB1B95 #BB911B #1BBB41

square

#1B45BB #BB1B95 #BB911B #1BBB41

split-complementary

#1B45BB #BB411B #95BB1B

monochromatic

#0C1E50 #133186 #1B45BB #3260E1 #6789E9

Accessibility & contrast

On white

8.03

#1B45BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#1B45BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B45BB

8.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B45BB	#FFFFFF	#000000	##FFFFFF
##1B45BB	1.00	8.03	2.62	8.03
#FFFFFF	8.03	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058BF

Deuteranopia (green-blind)

#0049B9

Tritanopia (blue-blind)

#006479

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #1b45bb;
/* rgb */ color: rgb(27, 69, 187);
/* oklch */ color: oklch(44.4% 0.191 264.5);

Tailwind

colors: {
  custom: {
    50: '#7778d0',
    500: '#1b45bb',
    950: '#000000',
  },
}

SCSS

$custom: #1b45bb;
$custom-light: #7778d0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b45bb",
  "rgb": {
    "r": 27,
    "g": 69,
    "b": 187
  },
  "hsl": {
    "h": 224.25,
    "s": 74.766,
    "l": 41.961
  },
  "oklch": {
    "l": 0.44412,
    "c": 0.19123,
    "h": 264.5
  },
  "luminance": 0.08077
}

Semantic roles & 50–950 ramp

primary

#1B45BB

secondary

#CEB263

accent

#C036F1

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0A0914

muted

#7C7B82

Preview Lab

Preview with #1B45BB

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

Preview Lab → · Contrast checker → · Palette generator →