#1B3F79#1B3F79

#1B3F79 is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.5% C 0.107 H 259.6°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F79
RGB	rgb(27, 63, 121)
HSL	hsl(217, 64%, 29%)
HSV	hsv(217, 78%, 47%)
CMYK	cmyk(77.7%, 47.9%, 0%, 52.5%)
CIE-LAB	lab(27.21, 9.23, -36.84)
CIE-LCH	lch(27.21, 37.98, 284.07°)
OKLab	oklab(37.54% -0.0194 -0.1056)
OKLCH	oklch(37.54% 0.107 259.6)
XYZ	xyz(5.6794, 5.1679, 18.7836)
Luminance	0.0517 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F79 #79551B

analogous

#1B6E79 #1B3F79 #261B79

triadic

#1B3F79 #791B3F #3F791B

tetradic

#1B3F79 #791B6E #79551B #1B7926

square

#1B3F79 #791B6E #79551B #1B7926

split-complementary

#1B3F79 #79261B #6E791B

monochromatic

#060D19 #102547 #1B3F79 #2659AB #3B75D3

Accessibility & contrast

On white

10.33

#1B3F79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1B3F79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F79

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F79	#FFFFFF	#000000	##FFFFFF
##1B3F79	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#20457B

Deuteranopia (green-blind)

#0B3C78

Tritanopia (blue-blind)

#004D56

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3f79;
/* rgb */ color: rgb(27, 63, 121);
/* oklch */ color: oklch(37.5% 0.107 259.6);

Tailwind

colors: {
  custom: {
    50: '#6673a0',
    500: '#1b3f79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f79;
$custom-light: #6673a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f79",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 121
  },
  "hsl": {
    "h": 217.021,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.37536,
    "c": 0.10741,
    "h": 259.6
  },
  "luminance": 0.05169
}

Semantic roles & 50–950 ramp

primary

#1B3F79

secondary

#AD8443

accent

#A741E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080F

muted

#7A7B7E

Preview Lab

Preview with #1B3F79

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

Preview Lab → · Contrast checker → · Palette generator →