#1B3F9B#1B3F9B

#1B3F9B is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.3% C 0.156 H 264.2°. Best body text is #FFFFFF at 9.41:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F9B
RGB	rgb(27, 63, 155)
HSL	hsl(223, 70%, 36%)
HSV	hsv(223, 83%, 61%)
CMYK	cmyk(82.6%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(29.80, 23.03, -53.68)
CIE-LCH	lch(29.80, 58.41, 293.22°)
OKLab	oklab(40.32% -0.0157 -0.1552)
OKLCH	oklch(40.32% 0.156 264.2)
XYZ	xyz(8.1438, 6.1536, 31.7625)
Luminance	0.0616 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F9B #9B771B

analogous

#1B7F9B #1B3F9B #371B9B

triadic

#1B3F9B #9B1B3F #3F9B1B

tetradic

#1B3F9B #9B1B7F #9B771B #1B9B37

square

#1B3F9B #9B1B7F #9B771B #1B9B37

split-complementary

#1B3F9B #9B371B #7F9B1B

monochromatic

#091533 #122A67 #1B3F9B #2454CF #5079E0

Accessibility & contrast

On white

9.41

#1B3F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1B3F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F9B

9.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F9B	#FFFFFF	#000000	##FFFFFF
##1B3F9B	1.00	9.41	2.23	9.41
#FFFFFF	9.41	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9E

Deuteranopia (green-blind)

#004099

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b3f9b;
/* rgb */ color: rgb(27, 63, 155);
/* oklch */ color: oklch(40.3% 0.156 264.2);

Tailwind

colors: {
  custom: {
    50: '#6f73b9',
    500: '#1b3f9b',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f9b;
$custom-light: #6f73b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f9b",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 223.125,
    "s": 70.33,
    "l": 35.686
  },
  "oklch": {
    "l": 0.40322,
    "c": 0.15596,
    "h": 264.2
  },
  "luminance": 0.06155
}

Semantic roles & 50–950 ramp

primary

#1B3F9B

secondary

#C3A24F

accent

#BB3BED

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3F9B

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

Preview Lab → · Contrast checker → · Palette generator →