#1B3F9F#1B3F9F

#1B3F9F is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.7% C 0.161 H 264.5°. Best body text is #FFFFFF at 9.30:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F9F
RGB	rgb(27, 63, 159)
HSL	hsl(224, 71%, 36%)
HSV	hsv(224, 83%, 62%)
CMYK	cmyk(83%, 60.4%, 0%, 37.6%)
CIE-LAB	lab(30.13, 24.62, -55.56)
CIE-LCH	lch(30.13, 60.77, 293.90°)
OKLab	oklab(40.68% -0.0155 -0.1607)
OKLCH	oklch(40.68% 0.161 264.5)
XYZ	xyz(8.4853, 6.2902, 33.5611)
Luminance	0.0629 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F9F #9F7B1B

analogous

#1B819F #1B3F9F #391B9F

triadic

#1B3F9F #9F1B3F #3F9F1B

tetradic

#1B3F9F #9F1B81 #9F7B1B #1B9F39

square

#1B3F9F #9F1B81 #9F7B1B #1B9F39

split-complementary

#1B3F9F #9F391B #819F1B

monochromatic

#091636 #122A6B #1B3F9F #2454D3 #537AE2

Accessibility & contrast

On white

9.30

#1B3F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#1B3F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F9F

9.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F9F	#FFFFFF	#000000	##FFFFFF
##1B3F9F	1.00	9.30	2.26	9.30
#FFFFFF	9.30	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA2

Deuteranopia (green-blind)

#00419D

Tritanopia (blue-blind)

#005868

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1b3f9f;
/* rgb */ color: rgb(27, 63, 159);
/* oklch */ color: oklch(40.7% 0.161 264.5);

Tailwind

colors: {
  custom: {
    50: '#7073bc',
    500: '#1b3f9f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f9f;
$custom-light: #7073bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f9f",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 159
  },
  "hsl": {
    "h": 223.636,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.40679,
    "c": 0.16143,
    "h": 264.5
  },
  "luminance": 0.06291
}

Semantic roles & 50–950 ramp

primary

#1B3F9F

secondary

#C5A551

accent

#BD3AEE

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3F9F

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

Preview Lab → · Contrast checker → · Palette generator →