#1B3A9F#1B3A9F

#1B3A9F is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.7% C 0.168 H 265.7°. Best body text is #FFFFFF at 9.76:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A9F
RGB	rgb(27, 58, 159)
HSL	hsl(226, 71%, 36%)
HSV	hsv(226, 83%, 62%)
CMYK	cmyk(83%, 63.5%, 0%, 37.6%)
CIE-LAB	lab(28.80, 28.01, -57.74)
CIE-LCH	lch(28.80, 64.17, 295.88°)
OKLab	oklab(39.69% -0.0126 -0.1671)
OKLCH	oklch(39.69% 0.168 265.7)
XYZ	xyz(8.2209, 5.7613, 33.4729)
Luminance	0.0576 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A9F #9F801B

analogous

#1B7C9F #1B3A9F #3E1B9F

triadic

#1B3A9F #9F1B3A #3A9F1B

tetradic

#1B3A9F #9F1B7C #9F801B #1B9F3E

square

#1B3A9F #9F1B7C #9F801B #1B9F3E

split-complementary

#1B3A9F #9F3E1B #7C9F1B

monochromatic

#091436 #12276B #1B3A9F #244DD3 #5374E2

Accessibility & contrast

On white

9.76

#1B3A9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#1B3A9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A9F

9.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A9F	#FFFFFF	#000000	##FFFFFF
##1B3A9F	1.00	9.76	2.15	9.76
#FFFFFF	9.76	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA2

Deuteranopia (green-blind)

#003E9D

Tritanopia (blue-blind)

#005467

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b3a9f;
/* rgb */ color: rgb(27, 58, 159);
/* oklch */ color: oklch(39.7% 0.168 265.7);

Tailwind

colors: {
  custom: {
    50: '#706fbc',
    500: '#1b3a9f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a9f;
$custom-light: #706fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a9f",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 159
  },
  "hsl": {
    "h": 225.909,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39688,
    "c": 0.16761,
    "h": 265.7
  },
  "luminance": 0.05762
}

Semantic roles & 50–950 ramp

primary

#1B3A9F

secondary

#C5A951

accent

#C43AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B3A9F

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

Preview Lab → · Contrast checker → · Palette generator →