#1F3797#1F3797

#1F3797 is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.5% C 0.159 H 267.3°. Best body text is #FFFFFF at 10.24:1 contrast (WCAG AA passes).

Color values

HEX	#1F3797
RGB	rgb(31, 55, 151)
HSL	hsl(228, 66%, 36%)
HSV	hsv(228, 79%, 59%)
CMYK	cmyk(79.5%, 63.6%, 0%, 40.8%)
CIE-LAB	lab(27.46, 27.30, -55.06)
CIE-LCH	lch(27.46, 61.46, 296.37°)
OKLab	oklab(38.51% -0.0076 -0.1593)
OKLCH	oklch(38.51% 0.159 267.3)
XYZ	xyz(7.5152, 5.2572, 29.8908)
Luminance	0.0526 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3797 #977F1F

analogous

#1F7397 #1F3797 #431F97

triadic

#1F3797 #971F37 #37971F

tetradic

#1F3797 #971F73 #977F1F #1F9743

square

#1F3797 #971F73 #977F1F #1F9743

split-complementary

#1F3797 #97431F #73971F

monochromatic

#0A1231 #152564 #1F3797 #2949CA #5470DC

Accessibility & contrast

On white

10.24

#1F3797 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#1F3797 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3797

10.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3797	#FFFFFF	#000000	##FFFFFF
##1F3797	1.00	10.24	2.05	10.24
#FFFFFF	10.24	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00479A

Deuteranopia (green-blind)

#003B95

Tritanopia (blue-blind)

#005061

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1f3797;
/* rgb */ color: rgb(31, 55, 151);
/* oklch */ color: oklch(38.5% 0.159 267.3);

Tailwind

colors: {
  custom: {
    50: '#6f6db6',
    500: '#1f3797',
    950: '#000000',
  },
}

SCSS

$custom: #1f3797;
$custom-light: #6f6db6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3797",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 151
  },
  "hsl": {
    "h": 228,
    "s": 65.934,
    "l": 35.686
  },
  "oklch": {
    "l": 0.38513,
    "c": 0.15944,
    "h": 267.3
  },
  "luminance": 0.05258
}

Semantic roles & 50–950 ramp

primary

#1F3797

secondary

#BFAA52

accent

#C73FE9

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #1F3797

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

Preview Lab → · Contrast checker → · Palette generator →