#1F3FA0#1F3FA0

#1F3FA0 is a dark, vivid blue. Relative luminance 0.064; OKLCH L 40.9% C 0.162 H 265.6°. Best body text is #FFFFFF at 9.22:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FA0
RGB	rgb(31, 63, 160)
HSL	hsl(225, 68%, 37%)
HSV	hsv(225, 81%, 63%)
CMYK	cmyk(80.6%, 60.6%, 0%, 37.3%)
CIE-LAB	lab(30.36, 25.38, -55.79)
CIE-LCH	lch(30.36, 61.29, 294.47°)
OKLab	oklab(40.91% -0.0125 -0.1613)
OKLCH	oklch(40.91% 0.162 265.6)
XYZ	xyz(8.6855, 6.3834, 34.0252)
Luminance	0.0638 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FA0 #A0801F

analogous

#1F80A0 #1F3FA0 #3F1FA0

triadic

#1F3FA0 #A01F3F #3FA01F

tetradic

#1F3FA0 #A01F80 #A0801F #1FA03F

square

#1F3FA0 #A01F80 #A0801F #1FA03F

split-complementary

#1F3FA0 #A03F1F #80A01F

monochromatic

#0B1739 #152B6D #1F3FA0 #2953D3 #5A7BDF

Accessibility & contrast

On white

9.22

#1F3FA0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#1F3FA0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FA0

9.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FA0	#FFFFFF	#000000	##FFFFFF
##1F3FA0	1.00	9.22	2.28	9.22
#FFFFFF	9.22	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA3

Deuteranopia (green-blind)

#00429E

Tritanopia (blue-blind)

#005869

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f3fa0;
/* rgb */ color: rgb(31, 63, 160);
/* oklch */ color: oklch(40.9% 0.162 265.6);

Tailwind

colors: {
  custom: {
    50: '#7173bd',
    500: '#1f3fa0',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fa0;
$custom-light: #7173bd;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fa0",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 160
  },
  "hsl": {
    "h": 225.116,
    "s": 67.539,
    "l": 37.451
  },
  "oklch": {
    "l": 0.40914,
    "c": 0.16178,
    "h": 265.6
  },
  "luminance": 0.06384
}

Semantic roles & 50–950 ramp

primary

#1F3FA0

secondary

#C3A858

accent

#BF3DEA

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3FA0

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

Preview Lab → · Contrast checker → · Palette generator →