#1B3FA6#1B3FA6

#1B3FA6 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.3% C 0.171 H 264.8°. Best body text is #FFFFFF at 9.10:1 contrast (WCAG AA passes).

Color values

HEX	#1B3FA6
RGB	rgb(27, 63, 166)
HSL	hsl(224, 72%, 38%)
HSV	hsv(224, 84%, 65%)
CMYK	cmyk(83.7%, 62%, 0%, 34.9%)
CIE-LAB	lab(30.74, 27.37, -58.80)
CIE-LCH	lch(30.74, 64.86, 294.96°)
OKLab	oklab(41.32% -0.0153 -0.1702)
OKLCH	oklch(41.32% 0.171 264.8)
XYZ	xyz(9.1100, 6.5401, 36.8512)
Luminance	0.0654 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3FA6 #A6821B

analogous

#1B85A6 #1B3FA6 #3C1BA6

triadic

#1B3FA6 #A61B3F #3FA61B

tetradic

#1B3FA6 #A61B85 #A6821B #1BA63C

square

#1B3FA6 #A61B85 #A6821B #1BA63C

split-complementary

#1B3FA6 #A63C1B #85A61B

monochromatic

#0A173D #122B71 #1B3FA6 #2453DB #587CE4

Accessibility & contrast

On white

9.10

#1B3FA6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#1B3FA6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3FA6

9.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3FA6	#FFFFFF	#000000	##FFFFFF
##1B3FA6	1.00	9.10	2.31	9.10
#FFFFFF	9.10	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FA9

Deuteranopia (green-blind)

#0042A4

Tritanopia (blue-blind)

#005A6C

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #1b3fa6;
/* rgb */ color: rgb(27, 63, 166);
/* oklch */ color: oklch(41.3% 0.171 264.8);

Tailwind

colors: {
  custom: {
    50: '#7273c1',
    500: '#1b3fa6',
    950: '#000000',
  },
}

SCSS

$custom: #1b3fa6;
$custom-light: #7273c1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3fa6",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 166
  },
  "hsl": {
    "h": 224.46,
    "s": 72.021,
    "l": 37.843
  },
  "oklch": {
    "l": 0.41315,
    "c": 0.17086,
    "h": 264.8
  },
  "luminance": 0.06541
}

Semantic roles & 50–950 ramp

primary

#1B3FA6

secondary

#C7AA56

accent

#C039EF

background

#F7F6FC

surface

#EEECF8

border

#C9C7D1

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1B3FA6

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

Preview Lab → · Contrast checker → · Palette generator →