#1B3F99#1B3F99

#1B3F99 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.1% C 0.153 H 264.1°. Best body text is #FFFFFF at 9.47:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F99
RGB	rgb(27, 63, 153)
HSL	hsl(223, 70%, 35%)
HSV	hsv(223, 82%, 60%)
CMYK	cmyk(82.4%, 58.8%, 0%, 40%)
CIE-LAB	lab(29.63, 22.23, -52.74)
CIE-LCH	lch(29.63, 57.23, 292.86°)
OKLab	oklab(40.15% -0.0158 -0.1524)
OKLCH	oklch(40.15% 0.153 264.1)
XYZ	xyz(7.9772, 6.0870, 30.8853)
Luminance	0.0609 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F99 #99751B

analogous

#1B7E99 #1B3F99 #361B99

triadic

#1B3F99 #991B3F #3F991B

tetradic

#1B3F99 #991B7E #99751B #1B9936

square

#1B3F99 #991B7E #99751B #1B9936

split-complementary

#1B3F99 #99361B #7E991B

monochromatic

#091431 #122A65 #1B3F99 #2454CD #4F78E0

Accessibility & contrast

On white

9.47

#1B3F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#1B3F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F99

9.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F99	#FFFFFF	#000000	##FFFFFF
##1B3F99	1.00	9.47	2.22	9.47
#FFFFFF	9.47	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9C

Deuteranopia (green-blind)

#004097

Tritanopia (blue-blind)

#005665

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b3f99;
/* rgb */ color: rgb(27, 63, 153);
/* oklch */ color: oklch(40.1% 0.153 264.1);

Tailwind

colors: {
  custom: {
    50: '#6e73b8',
    500: '#1b3f99',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f99;
$custom-light: #6e73b8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f99",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 222.857,
    "s": 70,
    "l": 35.294
  },
  "oklch": {
    "l": 0.40146,
    "c": 0.1532,
    "h": 264.1
  },
  "luminance": 0.06088
}

Semantic roles & 50–950 ramp

primary

#1B3F99

secondary

#C2A14E

accent

#BA3BED

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1B3F99

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

Preview Lab → · Contrast checker → · Palette generator →