#1F3BB4#1F3BB4

#1F3BB4 is a dark, vivid blue. Relative luminance 0.067; OKLCH L 42.0% C 0.193 H 266.8°. Best body text is #FFFFFF at 8.96:1 contrast (WCAG AA passes).

Color values

HEX	#1F3BB4
RGB	rgb(31, 59, 180)
HSL	hsl(229, 71%, 41%)
HSV	hsv(229, 83%, 71%)
CMYK	cmyk(82.8%, 67.2%, 0%, 29.4%)
CIE-LAB	lab(31.15, 35.66, -66.49)
CIE-LCH	lch(31.15, 75.45, 298.21°)
OKLab	oklab(42.05% -0.0107 -0.1926)
OKLCH	oklch(42.05% 0.193 266.8)
XYZ	xyz(10.3644, 6.7133, 43.9207)
Luminance	0.0672 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3BB4 #B4981F

analogous

#1F86B4 #1F3BB4 #4E1FB4

triadic

#1F3BB4 #B41F3B #3BB41F

tetradic

#1F3BB4 #B41F86 #B4981F #1FB44E

square

#1F3BB4 #B41F86 #B4981F #1FB44E

split-complementary

#1F3BB4 #B44E1F #86B41F

monochromatic

#0D194C #162A80 #1F3BB4 #3454DC #6880E5

Accessibility & contrast

On white

8.96

#1F3BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.34

#1F3BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3BB4

8.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3BB4	#FFFFFF	#000000	##FFFFFF
##1F3BB4	1.00	8.96	2.34	8.96
#FFFFFF	8.96	1.00	21.00	1.00
#000000	2.34	21.00	1.00	21.00
##FFFFFF	8.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B8

Deuteranopia (green-blind)

#0042B2

Tritanopia (blue-blind)

#005C72

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1f3bb4;
/* rgb */ color: rgb(31, 59, 180);
/* oklch */ color: oklch(42.0% 0.193 266.8);

Tailwind

colors: {
  custom: {
    50: '#7771cc',
    500: '#1f3bb4',
    950: '#000000',
  },
}

SCSS

$custom: #1f3bb4;
$custom-light: #7771cc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3bb4",
  "rgb": {
    "r": 31,
    "g": 59,
    "b": 180
  },
  "hsl": {
    "h": 228.725,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.42047,
    "c": 0.19294,
    "h": 266.8
  },
  "luminance": 0.06715
}

Semantic roles & 50–950 ramp

primary

#1F3BB4

secondary

#CBB764

accent

#CC3AED

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #1F3BB4

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

Preview Lab → · Contrast checker → · Palette generator →