#1B4DA1#1B4DA1

#1B4DA1 is a dark, vivid blue. Relative luminance 0.081; OKLCH L 43.8% C 0.147 H 260.3°. Best body text is #FFFFFF at 8.01:1 contrast (WCAG AA passes).

Color values

HEX	#1B4DA1
RGB	rgb(27, 77, 161)
HSL	hsl(218, 71%, 37%)
HSV	hsv(218, 83%, 63%)
CMYK	cmyk(83.2%, 52.2%, 0%, 36.9%)
CIE-LAB	lab(34.22, 15.89, -50.13)
CIE-LCH	lch(34.22, 52.59, 287.59°)
OKLab	oklab(43.82% -0.0247 -0.1444)
OKLCH	oklch(43.82% 0.147 260.3)
XYZ	xyz(9.5366, 8.1128, 34.7746)
Luminance	0.0811 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4DA1 #A16F1B

analogous

#1B90A1 #1B4DA1 #2C1BA1

triadic

#1B4DA1 #A11B4D #4DA11B

tetradic

#1B4DA1 #A11B90 #A16F1B #1BA12C

square

#1B4DA1 #A11B90 #A16F1B #1BA12C

split-complementary

#1B4DA1 #A12C1B #90A11B

monochromatic

#091B38 #12346D #1B4DA1 #2466D5 #5489E2

Accessibility & contrast

On white

8.01

#1B4DA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#1B4DA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4DA1

8.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4DA1	#FFFFFF	#000000	##FFFFFF
##1B4DA1	1.00	8.01	2.62	8.01
#FFFFFF	8.01	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1457A4

Deuteranopia (green-blind)

#004B9F

Tritanopia (blue-blind)

#00616F

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #1b4da1;
/* rgb */ color: rgb(27, 77, 161);
/* oklch */ color: oklch(43.8% 0.147 260.3);

Tailwind

colors: {
  custom: {
    50: '#6f7ebd',
    500: '#1b4da1',
    950: '#000000',
  },
}

SCSS

$custom: #1b4da1;
$custom-light: #6f7ebd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4da1",
  "rgb": {
    "r": 27,
    "g": 77,
    "b": 161
  },
  "hsl": {
    "h": 217.612,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.43815,
    "c": 0.14655,
    "h": 260.3
  },
  "luminance": 0.08114
}

Semantic roles & 50–950 ramp

primary

#1B4DA1

secondary

#C59A52

accent

#AB3AEE

background

#F7F7FB

surface

#EDEEF7

border

#C8C9D0

text

#090912

muted

#7B7B81

Preview Lab

Preview with #1B4DA1

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

Preview Lab → · Contrast checker → · Palette generator →