#1F3181#1F3181

#1F3181 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.136 H 268.6°. Best body text is #FFFFFF at 11.57:1 contrast (WCAG AA passes).

Color values

HEX	#1F3181
RGB	rgb(31, 49, 129)
HSL	hsl(229, 61%, 31%)
HSV	hsv(229, 76%, 51%)
CMYK	cmyk(76%, 62%, 0%, 49.4%)
CIE-LAB	lab(23.91, 22.82, -47.21)
CIE-LCH	lch(23.91, 52.44, 295.80°)
OKLab	oklab(35.28% -0.0033 -0.1363)
OKLCH	oklch(35.28% 0.136 268.6)
XYZ	xyz(5.6245, 4.0723, 21.2542)
Luminance	0.0407 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3181 #816F1F

analogous

#1F6281 #1F3181 #3E1F81

triadic

#1F3181 #811F31 #31811F

tetradic

#1F3181 #811F62 #816F1F #1F813E

square

#1F3181 #811F62 #816F1F #1F813E

split-complementary

#1F3181 #813E1F #62811F

monochromatic

#070C1E #131E50 #1F3181 #2B44B2 #4761D3

Accessibility & contrast

On white

11.57

#1F3181 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1F3181 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3181

11.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3181	#FFFFFF	#000000	##FFFFFF
##1F3181	1.00	11.57	1.81	11.57
#FFFFFF	11.57	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E84

Deuteranopia (green-blind)

#00347F

Tritanopia (blue-blind)

#004554

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f3181;
/* rgb */ color: rgb(31, 49, 129);
/* oklch */ color: oklch(35.3% 0.136 268.6);

Tailwind

colors: {
  custom: {
    50: '#6a68a6',
    500: '#1f3181',
    950: '#000000',
  },
}

SCSS

$custom: #1f3181;
$custom-light: #6a68a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3181",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 129
  },
  "hsl": {
    "h": 228.98,
    "s": 61.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.35282,
    "c": 0.13634,
    "h": 268.6
  },
  "luminance": 0.04073
}

Semantic roles & 50–950 ramp

primary

#1F3181

secondary

#B4A048

accent

#C743E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F3181

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

Preview Lab → · Contrast checker → · Palette generator →