#1B3C8F#1B3C8F

#1B3C8F is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.6% C 0.143 H 264.3°. Best body text is #FFFFFF at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#1B3C8F
RGB	rgb(27, 60, 143)
HSL	hsl(223, 68%, 33%)
HSV	hsv(223, 81%, 56%)
CMYK	cmyk(81.1%, 58%, 0%, 43.9%)
CIE-LAB	lab(27.97, 20.29, -49.31)
CIE-LCH	lch(27.97, 53.32, 292.36°)
OKLab	oklab(38.64% -0.0143 -0.1424)
OKLCH	oklch(38.64% 0.143 264.3)
XYZ	xyz(7.0240, 5.4471, 26.6625)
Luminance	0.0545 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3C8F #8F6E1B

analogous

#1B768F #1B3C8F #341B8F

triadic

#1B3C8F #8F1B3C #3C8F1B

tetradic

#1B3C8F #8F1B76 #8F6E1B #1B8F34

square

#1B3C8F #8F1B76 #8F6E1B #1B8F34

split-complementary

#1B3C8F #8F341B #768F1B

monochromatic

#081128 #11265C #1B3C8F #2552C2 #4872DC

Accessibility & contrast

On white

10.05

#1B3C8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#1B3C8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3C8F

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3C8F	#FFFFFF	#000000	##FFFFFF
##1B3C8F	1.00	10.05	2.09	10.05
#FFFFFF	10.05	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003D8D

Tritanopia (blue-blind)

#00515F

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1b3c8f;
/* rgb */ color: rgb(27, 60, 143);
/* oklch */ color: oklch(38.6% 0.143 264.3);

Tailwind

colors: {
  custom: {
    50: '#6c71b0',
    500: '#1b3c8f',
    950: '#000000',
  },
}

SCSS

$custom: #1b3c8f;
$custom-light: #6c71b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3c8f",
  "rgb": {
    "r": 27,
    "g": 60,
    "b": 143
  },
  "hsl": {
    "h": 222.931,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.38642,
    "c": 0.1431,
    "h": 264.3
  },
  "luminance": 0.05448
}

Semantic roles & 50–950 ramp

primary

#1B3C8F

secondary

#BE9C48

accent

#B93DEB

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B3C8F

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

Preview Lab → · Contrast checker → · Palette generator →