#1B3AA0#1B3AA0

#1B3AA0 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.8% C 0.169 H 265.7°. Best body text is #FFFFFF at 9.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B3AA0
RGB	rgb(27, 58, 160)
HSL	hsl(226, 71%, 37%)
HSV	hsv(226, 83%, 63%)
CMYK	cmyk(83.1%, 63.8%, 0%, 37.3%)
CIE-LAB	lab(28.89, 28.40, -58.20)
CIE-LCH	lch(28.89, 64.75, 296.01°)
OKLab	oklab(39.78% -0.0126 -0.1685)
OKLCH	oklch(39.78% 0.169 265.7)
XYZ	xyz(8.3080, 5.7962, 33.9318)
Luminance	0.0580 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3AA0 #A0811B

analogous

#1B7DA0 #1B3AA0 #3F1BA0

triadic

#1B3AA0 #A01B3A #3AA01B

tetradic

#1B3AA0 #A01B7D #A0811B #1BA03F

square

#1B3AA0 #A01B7D #A0811B #1BA03F

split-complementary

#1B3AA0 #A03F1B #7DA01B

monochromatic

#091437 #12276C #1B3AA0 #244DD4 #5375E2

Accessibility & contrast

On white

9.72

#1B3AA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1B3AA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3AA0

9.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3AA0	#FFFFFF	#000000	##FFFFFF
##1B3AA0	1.00	9.72	2.16	9.72
#FFFFFF	9.72	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA3

Deuteranopia (green-blind)

#003E9E

Tritanopia (blue-blind)

#005567

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b3aa0;
/* rgb */ color: rgb(27, 58, 160);
/* oklch */ color: oklch(39.8% 0.169 265.7);

Tailwind

colors: {
  custom: {
    50: '#706fbd',
    500: '#1b3aa0',
    950: '#000000',
  },
}

SCSS

$custom: #1b3aa0;
$custom-light: #706fbd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3aa0",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 160
  },
  "hsl": {
    "h": 226.015,
    "s": 71.123,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39782,
    "c": 0.16894,
    "h": 265.7
  },
  "luminance": 0.05797
}

Semantic roles & 50–950 ramp

primary

#1B3AA0

secondary

#C5AA52

accent

#C43AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B3AA0

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

Preview Lab → · Contrast checker → · Palette generator →