#1B37A1#1B37A1

#1B37A1 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 39.3% C 0.174 H 266.3°. Best body text is #FFFFFF at 9.96:1 contrast (WCAG AA passes).

Color values

HEX	#1B37A1
RGB	rgb(27, 55, 161)
HSL	hsl(227, 71%, 37%)
HSV	hsv(227, 83%, 63%)
CMYK	cmyk(83.2%, 65.8%, 0%, 36.9%)
CIE-LAB	lab(28.21, 30.79, -59.91)
CIE-LCH	lch(28.21, 67.36, 297.20°)
OKLab	oklab(39.31% -0.0111 -0.1735)
OKLCH	oklch(39.31% 0.174 266.3)
XYZ	xyz(8.2489, 5.5376, 34.3454)
Luminance	0.0554 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B37A1 #A1851B

analogous

#1B7AA1 #1B37A1 #421BA1

triadic

#1B37A1 #A11B37 #37A11B

tetradic

#1B37A1 #A11B7A #A1851B #1BA142

square

#1B37A1 #A11B7A #A1851B #1BA142

split-complementary

#1B37A1 #A1421B #7AA11B

monochromatic

#091338 #12256D #1B37A1 #2449D5 #5472E2

Accessibility & contrast

On white

9.96

#1B37A1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#1B37A1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B37A1

9.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B37A1	#FFFFFF	#000000	##FFFFFF
##1B37A1	1.00	9.96	2.11	9.96
#FFFFFF	9.96	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049A4

Deuteranopia (green-blind)

#003C9F

Tritanopia (blue-blind)

#005367

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b37a1;
/* rgb */ color: rgb(27, 55, 161);
/* oklch */ color: oklch(39.3% 0.174 266.3);

Tailwind

colors: {
  custom: {
    50: '#716dbe',
    500: '#1b37a1',
    950: '#000000',
  },
}

SCSS

$custom: #1b37a1;
$custom-light: #716dbe;
$custom-dark: #000000;

JSON

{
  "hex": "#1b37a1",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 161
  },
  "hsl": {
    "h": 227.463,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.39311,
    "c": 0.17387,
    "h": 266.3
  },
  "luminance": 0.05539
}

Semantic roles & 50–950 ramp

primary

#1B37A1

secondary

#C5AD52

accent

#C83AEE

background

#F7F6FB

surface

#EDEBF7

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B37A1

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

Preview Lab → · Contrast checker → · Palette generator →