#1F3FA7#1F3FA7

#1F3FA7 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.5% C 0.171 H 265.8°. Best body text is #FFFFFF at 9.02:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FA7
RGB	rgb(31, 63, 167)
HSL	hsl(226, 69%, 39%)
HSV	hsv(226, 81%, 65%)
CMYK	cmyk(81.4%, 62.3%, 0%, 34.5%)
CIE-LAB	lab(30.96, 28.11, -59.03)
CIE-LCH	lch(30.96, 65.38, 295.46°)
OKLab	oklab(41.55% -0.0124 -0.1708)
OKLCH	oklch(41.55% 0.171 265.8)
XYZ	xyz(9.3152, 6.6352, 37.3415)
Luminance	0.0664 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FA7 #A7871F

analogous

#1F83A7 #1F3FA7 #431FA7

triadic

#1F3FA7 #A71F3F #3FA71F

tetradic

#1F3FA7 #A71F83 #A7871F #1FA743

square

#1F3FA7 #A71F83 #A7871F #1FA743

split-complementary

#1F3FA7 #A7431F #83A71F

monochromatic

#0C1840 #152C73 #1F3FA7 #2B54D8 #5F7EE1

Accessibility & contrast

On white

9.02

#1F3FA7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#1F3FA7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FA7

9.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FA7	#FFFFFF	#000000	##FFFFFF
##1F3FA7	1.00	9.02	2.33	9.02
#FFFFFF	9.02	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FAA

Deuteranopia (green-blind)

#0043A5

Tritanopia (blue-blind)

#005A6D

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1f3fa7;
/* rgb */ color: rgb(31, 63, 167);
/* oklch */ color: oklch(41.5% 0.171 265.8);

Tailwind

colors: {
  custom: {
    50: '#7373c2',
    500: '#1f3fa7',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fa7;
$custom-light: #7373c2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fa7",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 167
  },
  "hsl": {
    "h": 225.882,
    "s": 68.687,
    "l": 38.824
  },
  "oklch": {
    "l": 0.41549,
    "c": 0.17122,
    "h": 265.8
  },
  "luminance": 0.06636
}

Semantic roles & 50–950 ramp

primary

#1F3FA7

secondary

#C6AD5C

accent

#C23CEC

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3FA7

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

Preview Lab → · Contrast checker → · Palette generator →