#1B3F9A#1B3F9A

#1B3F9A is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.2% C 0.155 H 264.2°. Best body text is #FFFFFF at 9.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F9A
RGB	rgb(27, 63, 154)
HSL	hsl(223, 70%, 35%)
HSV	hsv(223, 82%, 60%)
CMYK	cmyk(82.5%, 59.1%, 0%, 39.6%)
CIE-LAB	lab(29.71, 22.63, -53.21)
CIE-LCH	lch(29.71, 57.82, 293.04°)
OKLab	oklab(40.23% -0.0157 -0.1538)
OKLCH	oklch(40.23% 0.155 264.2)
XYZ	xyz(8.0602, 6.1202, 31.3221)
Luminance	0.0612 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F9A #9A761B

analogous

#1B7E9A #1B3F9A #361B9A

triadic

#1B3F9A #9A1B3F #3F9A1B

tetradic

#1B3F9A #9A1B7E #9A761B #1B9A36

square

#1B3F9A #9A1B7E #9A761B #1B9A36

split-complementary

#1B3F9A #9A361B #7E9A1B

monochromatic

#091432 #122A66 #1B3F9A #2454CE #4F78E0

Accessibility & contrast

On white

9.44

#1B3F9A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#1B3F9A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F9A

9.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F9A	#FFFFFF	#000000	##FFFFFF
##1B3F9A	1.00	9.44	2.22	9.44
#FFFFFF	9.44	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9D

Deuteranopia (green-blind)

#004098

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b3f9a;
/* rgb */ color: rgb(27, 63, 154);
/* oklch */ color: oklch(40.2% 0.155 264.2);

Tailwind

colors: {
  custom: {
    50: '#6e73b9',
    500: '#1b3f9a',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f9a;
$custom-light: #6e73b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f9a",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 154
  },
  "hsl": {
    "h": 222.992,
    "s": 70.166,
    "l": 35.49
  },
  "oklch": {
    "l": 0.40234,
    "c": 0.15458,
    "h": 264.2
  },
  "luminance": 0.06121
}

Semantic roles & 50–950 ramp

primary

#1B3F9A

secondary

#C3A24E

accent

#BA3BED

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1B3F9A

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

Preview Lab → · Contrast checker → · Palette generator →