#1F3F9B#1F3F9B

#1F3F9B is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.5% C 0.155 H 265.3°. Best body text is #FFFFFF at 9.36:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F9B
RGB	rgb(31, 63, 155)
HSL	hsl(225, 67%, 36%)
HSV	hsv(225, 80%, 61%)
CMYK	cmyk(80%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(29.94, 23.42, -53.44)
CIE-LCH	lch(29.94, 58.35, 293.67°)
OKLab	oklab(40.47% -0.0127 -0.1544)
OKLCH	oklch(40.47% 0.155 265.3)
XYZ	xyz(8.2569, 6.2119, 31.7678)
Luminance	0.0621 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F9B #9B7B1F

analogous

#1F7D9B #1F3F9B #3D1F9B

triadic

#1F3F9B #9B1F3F #3F9B1F

tetradic

#1F3F9B #9B1F7D #9B7B1F #1F9B3D

square

#1F3F9B #9B1F7D #9B7B1F #1F9B3D

split-complementary

#1F3F9B #9B3D1F #7D9B1F

monochromatic

#0B1635 #152A68 #1F3F9B #2954CE #577ADD

Accessibility & contrast

On white

9.36

#1F3F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#1F3F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F9B

9.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F9B	#FFFFFF	#000000	##FFFFFF
##1F3F9B	1.00	9.36	2.24	9.36
#FFFFFF	9.36	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9E

Deuteranopia (green-blind)

#004199

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f3f9b;
/* rgb */ color: rgb(31, 63, 155);
/* oklch */ color: oklch(40.5% 0.155 265.3);

Tailwind

colors: {
  custom: {
    50: '#7073b9',
    500: '#1f3f9b',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f9b;
$custom-light: #7073b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f9b",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 224.516,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.4047,
    "c": 0.15491,
    "h": 265.3
  },
  "luminance": 0.06213
}

Semantic roles & 50–950 ramp

primary

#1F3F9B

secondary

#C1A555

accent

#BD3EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3F9B

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

Preview Lab → · Contrast checker → · Palette generator →