#1F3A9B#1F3A9B

#1F3A9B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.5% C 0.161 H 266.6°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#1F3A9B
RGB	rgb(31, 58, 155)
HSL	hsl(227, 67%, 36%)
HSV	hsv(227, 80%, 61%)
CMYK	cmyk(80%, 62.6%, 0%, 39.2%)
CIE-LAB	lab(28.60, 26.82, -55.63)
CIE-LCH	lch(28.60, 61.76, 295.74°)
OKLab	oklab(39.47% -0.0094 -0.1609)
OKLCH	oklch(39.47% 0.161 266.6)
XYZ	xyz(7.9925, 5.6831, 31.6797)
Luminance	0.0568 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3A9B #9B801F

analogous

#1F789B #1F3A9B #421F9B

triadic

#1F3A9B #9B1F3A #3A9B1F

tetradic

#1F3A9B #9B1F78 #9B801F #1F9B42

square

#1F3A9B #9B1F78 #9B801F #1F9B42

split-complementary

#1F3A9B #9B421F #789B1F

monochromatic

#0B1435 #152768 #1F3A9B #294DCE #5774DD

Accessibility & contrast

On white

9.83

#1F3A9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1F3A9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3A9B

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3A9B	#FFFFFF	#000000	##FFFFFF
##1F3A9B	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00499E

Deuteranopia (green-blind)

#003E99

Tritanopia (blue-blind)

#005365

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f3a9b;
/* rgb */ color: rgb(31, 58, 155);
/* oklch */ color: oklch(39.5% 0.161 266.6);

Tailwind

colors: {
  custom: {
    50: '#706fb9',
    500: '#1f3a9b',
    950: '#000000',
  },
}

SCSS

$custom: #1f3a9b;
$custom-light: #706fb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3a9b",
  "rgb": {
    "r": 31,
    "g": 58,
    "b": 155
  },
  "hsl": {
    "h": 226.935,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.3947,
    "c": 0.16118,
    "h": 266.6
  },
  "luminance": 0.05684
}

Semantic roles & 50–950 ramp

primary

#1F3A9B

secondary

#C1A955

accent

#C43EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F3A9B

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

Preview Lab → · Contrast checker → · Palette generator →