#1B4FA1#1B4FA1

#1B4FA1 is a dark, vivid blue. Relative luminance 0.084; OKLCH L 44.3% C 0.144 H 259.5°. Best body text is #FFFFFF at 7.84:1 contrast (WCAG AA passes).

Color values

HEX	#1B4FA1
RGB	rgb(27, 79, 161)
HSL	hsl(217, 71%, 37%)
HSV	hsv(217, 83%, 63%)
CMYK	cmyk(83.2%, 50.9%, 0%, 36.9%)
CIE-LAB	lab(34.80, 14.54, -49.19)
CIE-LCH	lch(34.80, 51.29, 286.46°)
OKLab	oklab(44.26% -0.0262 -0.1416)
OKLCH	oklch(44.26% 0.144 259.5)
XYZ	xyz(9.6786, 8.3970, 34.8220)
Luminance	0.0840 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4FA1 #A16D1B

analogous

#1B92A1 #1B4FA1 #2A1BA1

triadic

#1B4FA1 #A11B4F #4FA11B

tetradic

#1B4FA1 #A11B92 #A16D1B #1BA12A

square

#1B4FA1 #A11B92 #A16D1B #1BA12A

split-complementary

#1B4FA1 #A12A1B #92A11B

monochromatic

#091C38 #12356D #1B4FA1 #2469D5 #548BE2

Accessibility & contrast

On white

7.84

#1B4FA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#1B4FA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4FA1

7.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4FA1	#FFFFFF	#000000	##FFFFFF
##1B4FA1	1.00	7.84	2.68	7.84
#FFFFFF	7.84	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B58A4

Deuteranopia (green-blind)

#004C9F

Tritanopia (blue-blind)

#006370

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #1b4fa1;
/* rgb */ color: rgb(27, 79, 161);
/* oklch */ color: oklch(44.3% 0.144 259.5);

Tailwind

colors: {
  custom: {
    50: '#6f7fbd',
    500: '#1b4fa1',
    950: '#000000',
  },
}

SCSS

$custom: #1b4fa1;
$custom-light: #6f7fbd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4fa1",
  "rgb": {
    "r": 27,
    "g": 79,
    "b": 161
  },
  "hsl": {
    "h": 216.716,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.44258,
    "c": 0.14405,
    "h": 259.5
  },
  "luminance": 0.08398
}

Semantic roles & 50–950 ramp

primary

#1B4FA1

secondary

#C59952

accent

#A83AEE

background

#F7F7FB

surface

#EDEEF7

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1B4FA1

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

Preview Lab → · Contrast checker → · Palette generator →