#1F3F9F#1F3F9F

#1F3F9F is a dark, vivid blue. Relative luminance 0.064; OKLCH L 40.8% C 0.160 H 265.5°. Best body text is #FFFFFF at 9.25:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F9F
RGB	rgb(31, 63, 159)
HSL	hsl(225, 67%, 37%)
HSV	hsv(225, 81%, 62%)
CMYK	cmyk(80.5%, 60.4%, 0%, 37.6%)
CIE-LAB	lab(30.28, 24.99, -55.32)
CIE-LCH	lch(30.28, 60.71, 294.31°)
OKLab	oklab(40.83% -0.0126 -0.1599)
OKLCH	oklch(40.83% 0.16 265.5)
XYZ	xyz(8.5984, 6.3485, 33.5664)
Luminance	0.0635 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F9F #9F7F1F

analogous

#1F7F9F #1F3F9F #3F1F9F

triadic

#1F3F9F #9F1F3F #3F9F1F

tetradic

#1F3F9F #9F1F7F #9F7F1F #1F9F3F

square

#1F3F9F #9F1F7F #9F7F1F #1F9F3F

split-complementary

#1F3F9F #9F3F1F #7F9F1F

monochromatic

#0B1639 #152B6C #1F3F9F #2953D2 #5A7BDF

Accessibility & contrast

On white

9.25

#1F3F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#1F3F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F9F

9.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F9F	#FFFFFF	#000000	##FFFFFF
##1F3F9F	1.00	9.25	2.27	9.25
#FFFFFF	9.25	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA2

Deuteranopia (green-blind)

#00429D

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f3f9f;
/* rgb */ color: rgb(31, 63, 159);
/* oklch */ color: oklch(40.8% 0.160 265.5);

Tailwind

colors: {
  custom: {
    50: '#7173bc',
    500: '#1f3f9f',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f9f;
$custom-light: #7173bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f9f",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 159
  },
  "hsl": {
    "h": 225,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.40825,
    "c": 0.1604,
    "h": 265.5
  },
  "luminance": 0.0635
}

Semantic roles & 50–950 ramp

primary

#1F3F9F

secondary

#C3A857

accent

#BF3EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3F9F

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

Preview Lab → · Contrast checker → · Palette generator →