#1B3F9E#1B3F9E

#1B3F9E is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.6% C 0.160 H 264.4°. Best body text is #FFFFFF at 9.33:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F9E
RGB	rgb(27, 63, 158)
HSL	hsl(224, 71%, 36%)
HSV	hsv(224, 83%, 62%)
CMYK	cmyk(82.9%, 60.1%, 0%, 38%)
CIE-LAB	lab(30.05, 24.22, -55.09)
CIE-LCH	lch(30.05, 60.18, 293.73°)
OKLab	oklab(40.59% -0.0155 -0.1593)
OKLCH	oklch(40.59% 0.16 264.4)
XYZ	xyz(8.3989, 6.2556, 33.1059)
Luminance	0.0626 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F9E #9E7A1B

analogous

#1B819E #1B3F9E #381B9E

triadic

#1B3F9E #9E1B3F #3F9E1B

tetradic

#1B3F9E #9E1B81 #9E7A1B #1B9E38

square

#1B3F9E #9E1B81 #9E7A1B #1B9E38

split-complementary

#1B3F9E #9E381B #819E1B

monochromatic

#091535 #122A6A #1B3F9E #2454D2 #5279E1

Accessibility & contrast

On white

9.33

#1B3F9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#1B3F9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F9E

9.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F9E	#FFFFFF	#000000	##FFFFFF
##1B3F9E	1.00	9.33	2.25	9.33
#FFFFFF	9.33	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA1

Deuteranopia (green-blind)

#00419C

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1b3f9e;
/* rgb */ color: rgb(27, 63, 158);
/* oklch */ color: oklch(40.6% 0.160 264.4);

Tailwind

colors: {
  custom: {
    50: '#6f73bb',
    500: '#1b3f9e',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f9e;
$custom-light: #6f73bb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f9e",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 158
  },
  "hsl": {
    "h": 223.511,
    "s": 70.811,
    "l": 36.275
  },
  "oklch": {
    "l": 0.40589,
    "c": 0.16007,
    "h": 264.4
  },
  "luminance": 0.06257
}

Semantic roles & 50–950 ramp

primary

#1B3F9E

secondary

#C4A451

accent

#BC3AEE

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3F9E

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

Preview Lab → · Contrast checker → · Palette generator →