#1B4FB4#1B4FB4

#1B4FB4 is a mid, vivid blue. Relative luminance 0.091; OKLCH L 45.8% C 0.170 H 261.9°. Best body text is #FFFFFF at 7.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B4FB4
RGB	rgb(27, 79, 180)
HSL	hsl(220, 74%, 41%)
HSV	hsv(220, 85%, 71%)
CMYK	cmyk(85%, 56.1%, 0%, 29.4%)
CIE-LAB	lab(36.21, 22.13, -58.21)
CIE-LCH	lch(36.21, 62.27, 290.81°)
OKLab	oklab(45.78% -0.0241 -0.1682)
OKLCH	oklch(45.78% 0.17 261.9)
XYZ	xyz(11.4832, 9.1188, 44.3260)
Luminance	0.0912 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4FB4 #B4801B

analogous

#1B9BB4 #1B4FB4 #341BB4

triadic

#1B4FB4 #B41B4F #4FB41B

tetradic

#1B4FB4 #B41B9B #B4801B #1BB434

square

#1B4FB4 #B41B9B #B4801B #1BB434

split-complementary

#1B4FB4 #B4341B #9BB41B

monochromatic

#0B204A #13387F #1B4FB4 #2D69DF #628FE7

Accessibility & contrast

On white

7.44

#1B4FB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.82

#1B4FB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4FB4

7.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4FB4	#FFFFFF	#000000	##FFFFFF
##1B4FB4	1.00	7.44	2.82	7.44
#FFFFFF	7.44	1.00	21.00	1.00
#000000	2.82	21.00	1.00	21.00
##FFFFFF	7.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CB7

Deuteranopia (green-blind)

#004FB2

Tritanopia (blue-blind)

#006879

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1b4fb4;
/* rgb */ color: rgb(27, 79, 180);
/* oklch */ color: oklch(45.8% 0.170 261.9);

Tailwind

colors: {
  custom: {
    50: '#747fcb',
    500: '#1b4fb4',
    950: '#000000',
  },
}

SCSS

$custom: #1b4fb4;
$custom-light: #747fcb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4fb4",
  "rgb": {
    "r": 27,
    "g": 79,
    "b": 180
  },
  "hsl": {
    "h": 219.608,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.45783,
    "c": 0.16989,
    "h": 261.9
  },
  "luminance": 0.0912
}

Semantic roles & 50–950 ramp

primary

#1B4FB4

secondary

#CCA75F

accent

#B237F1

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #1B4FB4

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

Preview Lab → · Contrast checker → · Palette generator →