#1B2F81#1B2F81

#1B2F81 is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.7% C 0.140 H 267.7°. Best body text is #FFFFFF at 11.86:1 contrast (WCAG AA passes).

Color values

HEX	#1B2F81
RGB	rgb(27, 47, 129)
HSL	hsl(228, 65%, 31%)
HSV	hsv(228, 79%, 51%)
CMYK	cmyk(79.1%, 63.6%, 0%, 49.4%)
CIE-LAB	lab(23.17, 23.73, -48.42)
CIE-LCH	lch(23.17, 53.92, 296.10°)
OKLab	oklab(34.68% -0.0057 -0.14)
OKLCH	oklch(34.68% 0.14 267.7)
XYZ	xyz(5.4296, 3.8504, 21.2217)
Luminance	0.0385 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2F81 #816D1B

analogous

#1B6281 #1B2F81 #3A1B81

triadic

#1B2F81 #811B2F #2F811B

tetradic

#1B2F81 #811B62 #816D1B #1B813A

square

#1B2F81 #811B62 #816D1B #1B813A

split-complementary

#1B2F81 #813A1B #62811B

monochromatic

#060A1C #101D4E #1B2F81 #2641B4 #3F5DD7

Accessibility & contrast

On white

11.86

#1B2F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1B2F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2F81

11.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2F81	#FFFFFF	#000000	##FFFFFF
##1B2F81	1.00	11.86	1.77	11.86
#FFFFFF	11.86	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C84

Deuteranopia (green-blind)

#00337F

Tritanopia (blue-blind)

#004453

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b2f81;
/* rgb */ color: rgb(27, 47, 129);
/* oklch */ color: oklch(34.7% 0.140 267.7);

Tailwind

colors: {
  custom: {
    50: '#6967a6',
    500: '#1b2f81',
    950: '#000000',
  },
}

SCSS

$custom: #1b2f81;
$custom-light: #6967a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2f81",
  "rgb": {
    "r": 27,
    "g": 47,
    "b": 129
  },
  "hsl": {
    "h": 228.235,
    "s": 65.385,
    "l": 30.588
  },
  "oklch": {
    "l": 0.3468,
    "c": 0.1401,
    "h": 267.7
  },
  "luminance": 0.03851
}

Semantic roles & 50–950 ramp

primary

#1B2F81

secondary

#B59E43

accent

#C73FE8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B2F81

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

Preview Lab → · Contrast checker → · Palette generator →