#1B3979#1B3979

#1B3979 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 36.1% C 0.115 H 263.0°. Best body text is #FFFFFF at 11.01:1 contrast (WCAG AA passes).

Color values

HEX	#1B3979
RGB	rgb(27, 57, 121)
HSL	hsl(221, 64%, 29%)
HSV	hsv(221, 78%, 47%)
CMYK	cmyk(77.7%, 52.9%, 0%, 52.5%)
CIE-LAB	lab(25.38, 13.44, -39.79)
CIE-LCH	lch(25.38, 41.99, 288.67°)
OKLab	oklab(36.14% -0.014 -0.1144)
OKLCH	oklch(36.14% 0.115 263)
XYZ	xyz(5.3651, 4.5391, 18.6788)
Luminance	0.0454 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3979 #795B1B

analogous

#1B6879 #1B3979 #2C1B79

triadic

#1B3979 #791B39 #39791B

tetradic

#1B3979 #791B68 #795B1B #1B792C

square

#1B3979 #791B68 #795B1B #1B792C

split-complementary

#1B3979 #792C1B #68791B

monochromatic

#060C19 #102147 #1B3979 #2651AB #3B6CD3

Accessibility & contrast

On white

11.01

#1B3979 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#1B3979 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3979

11.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3979	#FFFFFF	#000000	##FFFFFF
##1B3979	1.00	11.01	1.91	11.01
#FFFFFF	11.01	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#11417B

Deuteranopia (green-blind)

#003878

Tritanopia (blue-blind)

#004853

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b3979;
/* rgb */ color: rgb(27, 57, 121);
/* oklch */ color: oklch(36.1% 0.115 263.0);

Tailwind

colors: {
  custom: {
    50: '#666ea0',
    500: '#1b3979',
    950: '#000000',
  },
}

SCSS

$custom: #1b3979;
$custom-light: #666ea0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3979",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 121
  },
  "hsl": {
    "h": 220.851,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.36135,
    "c": 0.11527,
    "h": 263
  },
  "luminance": 0.0454
}

Semantic roles & 50–950 ramp

primary

#1B3979

secondary

#AD8B43

accent

#B241E7

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3979

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

Preview Lab → · Contrast checker → · Palette generator →