#1F3F8F#1F3F8F

#1F3F8F is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.4% C 0.138 H 264.4°. Best body text is #FFFFFF at 9.70:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F8F
RGB	rgb(31, 63, 143)
HSL	hsl(223, 64%, 34%)
HSV	hsv(223, 78%, 56%)
CMYK	cmyk(78.3%, 55.9%, 0%, 43.9%)
CIE-LAB	lab(28.98, 18.66, -47.67)
CIE-LCH	lch(28.98, 51.19, 291.38°)
OKLab	oklab(39.44% -0.0134 -0.1374)
OKLCH	oklch(39.44% 0.138 264.4)
XYZ	xyz(7.2987, 5.8287, 26.7217)
Luminance	0.0583 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F8F #8F6F1F

analogous

#1F778F #1F3F8F #371F8F

triadic

#1F3F8F #8F1F3F #3F8F1F

tetradic

#1F3F8F #8F1F77 #8F6F1F #1F8F37

square

#1F3F8F #8F1F77 #8F6F1F #1F8F37

split-complementary

#1F3F8F #8F371F #778F1F

monochromatic

#09132A #14295D #1F3F8F #2A55C1 #4F77D9

Accessibility & contrast

On white

9.70

#1F3F8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#1F3F8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F8F

9.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F8F	#FFFFFF	#000000	##FFFFFF
##1F3F8F	1.00	9.70	2.17	9.70
#FFFFFF	9.70	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A92

Deuteranopia (green-blind)

#003F8D

Tritanopia (blue-blind)

#005360

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f3f8f;
/* rgb */ color: rgb(31, 63, 143);
/* oklch */ color: oklch(39.4% 0.138 264.4);

Tailwind

colors: {
  custom: {
    50: '#6d73b0',
    500: '#1f3f8f',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f8f;
$custom-light: #6d73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f8f",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 143
  },
  "hsl": {
    "h": 222.857,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.39442,
    "c": 0.13809,
    "h": 264.4
  },
  "luminance": 0.05829
}

Semantic roles & 50–950 ramp

primary

#1F3F8F

secondary

#BC9C4E

accent

#B840E7

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1F3F8F

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

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