#1B1FA0#1B1FA0

#1B1FA0 is a dark, vivid blue. Relative luminance 0.038; OKLCH L 35.4% C 0.198 H 269.3°. Best body text is #FFFFFF at 12.00:1 contrast (WCAG AA passes).

Color values

HEX	#1B1FA0
RGB	rgb(27, 31, 160)
HSL	hsl(238, 71%, 37%)
HSV	hsv(238, 83%, 63%)
CMYK	cmyk(83.1%, 80.6%, 0%, 37.3%)
CIE-LAB	lab(22.83, 45.03, -68.20)
CIE-LCH	lch(22.83, 81.72, 303.44°)
OKLab	oklab(35.41% -0.0023 -0.1975)
OKLCH	oklch(35.41% 0.198 269.3)
XYZ	xyz(7.2850, 3.7502, 33.5908)
Luminance	0.0375 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1FA0 #A09C1B

analogous

#1B62A0 #1B1FA0 #591BA0

triadic

#1B1FA0 #A01B1F #1FA01B

tetradic

#1B1FA0 #A01B62 #A09C1B #1BA059

square

#1B1FA0 #A01B62 #A09C1B #1BA059

split-complementary

#1B1FA0 #A0591B #62A01B

monochromatic

#090B37 #12156C #1B1FA0 #2429D4 #5358E2

Accessibility & contrast

On white

12.00

#1B1FA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1B1FA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1FA0

12.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1FA0	#FFFFFF	#000000	##FFFFFF
##1B1FA0	1.00	12.00	1.75	12.00
#FFFFFF	12.00	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	12.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003DA4

Deuteranopia (green-blind)

#002F9E

Tritanopia (blue-blind)

#004760

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b1fa0;
/* rgb */ color: rgb(27, 31, 160);
/* oklch */ color: oklch(35.4% 0.198 269.3);

Tailwind

colors: {
  custom: {
    50: '#735ebd',
    500: '#1b1fa0',
    950: '#000000',
  },
}

SCSS

$custom: #1b1fa0;
$custom-light: #735ebd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1fa0",
  "rgb": {
    "r": 27,
    "g": 31,
    "b": 160
  },
  "hsl": {
    "h": 238.195,
    "s": 71.123,
    "l": 36.667
  },
  "oklch": {
    "l": 0.35408,
    "c": 0.19753,
    "h": 269.3
  },
  "luminance": 0.03751
}

Semantic roles & 50–950 ramp

primary

#1B1FA0

secondary

#C5C152

accent

#E83AEE

background

#F7F5FB

surface

#EEE9F7

border

#C9C5D0

text

#0A0412

muted

#7C7981

Preview Lab

Preview with #1B1FA0

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

Preview Lab → · Contrast checker → · Palette generator →