#1F3FA8#1F3FA8

#1F3FA8 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.6% C 0.173 H 265.9°. Best body text is #FFFFFF at 9.00:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FA8
RGB	rgb(31, 63, 168)
HSL	hsl(226, 69%, 39%)
HSV	hsv(226, 82%, 66%)
CMYK	cmyk(81.5%, 62.5%, 0%, 34.1%)
CIE-LAB	lab(31.05, 28.49, -59.48)
CIE-LCH	lch(31.05, 65.95, 295.59°)
OKLab	oklab(41.64% -0.0124 -0.1721)
OKLCH	oklch(41.64% 0.173 265.9)
XYZ	xyz(9.4080, 6.6724, 37.8302)
Luminance	0.0667 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FA8 #A8881F

analogous

#1F84A8 #1F3FA8 #431FA8

triadic

#1F3FA8 #A81F3F #3FA81F

tetradic

#1F3FA8 #A81F84 #A8881F #1FA843

square

#1F3FA8 #A81F84 #A8881F #1FA843

split-complementary

#1F3FA8 #A8431F #84A81F

monochromatic

#0C1841 #152C74 #1F3FA8 #2C54D8 #607EE2

Accessibility & contrast

On white

9.00

#1F3FA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#1F3FA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FA8

9.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FA8	#FFFFFF	#000000	##FFFFFF
##1F3FA8	1.00	9.00	2.33	9.00
#FFFFFF	9.00	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050AB

Deuteranopia (green-blind)

#0043A6

Tritanopia (blue-blind)

#005A6D

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1f3fa8;
/* rgb */ color: rgb(31, 63, 168);
/* oklch */ color: oklch(41.6% 0.173 265.9);

Tailwind

colors: {
  custom: {
    50: '#7373c3',
    500: '#1f3fa8',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fa8;
$custom-light: #7373c3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fa8",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 168
  },
  "hsl": {
    "h": 225.985,
    "s": 68.844,
    "l": 39.02
  },
  "oklch": {
    "l": 0.4164,
    "c": 0.17256,
    "h": 265.9
  },
  "luminance": 0.06673
}

Semantic roles & 50–950 ramp

primary

#1F3FA8

secondary

#C6AE5D

accent

#C33CEC

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F3FA8

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

Preview Lab → · Contrast checker → · Palette generator →