#1F3FA6#1F3FA6

#1F3FA6 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.5% C 0.170 H 265.8°. Best body text is #FFFFFF at 9.05:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FA6
RGB	rgb(31, 63, 166)
HSL	hsl(226, 69%, 39%)
HSV	hsv(226, 81%, 65%)
CMYK	cmyk(81.3%, 62%, 0%, 34.9%)
CIE-LAB	lab(30.87, 27.72, -58.57)
CIE-LCH	lch(30.87, 64.79, 295.33°)
OKLab	oklab(41.46% -0.0124 -0.1694)
OKLCH	oklch(41.46% 0.17 265.8)
XYZ	xyz(9.2231, 6.5984, 36.8565)
Luminance	0.0660 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FA6 #A6861F

analogous

#1F82A6 #1F3FA6 #421FA6

triadic

#1F3FA6 #A61F3F #3FA61F

tetradic

#1F3FA6 #A61F82 #A6861F #1FA642

square

#1F3FA6 #A61F82 #A6861F #1FA642

split-complementary

#1F3FA6 #A6421F #82A61F

monochromatic

#0C183F #152B72 #1F3FA6 #2B54D7 #5E7DE1

Accessibility & contrast

On white

9.05

#1F3FA6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#1F3FA6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FA6

9.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FA6	#FFFFFF	#000000	##FFFFFF
##1F3FA6	1.00	9.05	2.32	9.05
#FFFFFF	9.05	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FA9

Deuteranopia (green-blind)

#0043A4

Tritanopia (blue-blind)

#005A6C

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1f3fa6;
/* rgb */ color: rgb(31, 63, 166);
/* oklch */ color: oklch(41.5% 0.170 265.8);

Tailwind

colors: {
  custom: {
    50: '#7373c1',
    500: '#1f3fa6',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fa6;
$custom-light: #7373c1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fa6",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 166
  },
  "hsl": {
    "h": 225.778,
    "s": 68.528,
    "l": 38.627
  },
  "oklch": {
    "l": 0.41457,
    "c": 0.16989,
    "h": 265.8
  },
  "luminance": 0.06599
}

Semantic roles & 50–950 ramp

primary

#1F3FA6

secondary

#C5AC5B

accent

#C23CEB

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3FA6

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

Preview Lab → · Contrast checker → · Palette generator →