#1F3AA8#1F3AA8

#1F3AA8 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.7% C 0.179 H 266.9°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F3AA8
RGB	rgb(31, 58, 168)
HSL	hsl(228, 69%, 39%)
HSV	hsv(228, 82%, 66%)
CMYK	cmyk(81.5%, 65.5%, 0%, 34.1%)
CIE-LAB	lab(29.77, 31.81, -61.58)
CIE-LCH	lch(29.77, 69.31, 297.32°)
OKLab	oklab(40.7% -0.0097 -0.1783)
OKLCH	oklch(40.7% 0.179 266.9)
XYZ	xyz(9.1435, 6.1435, 37.7421)
Luminance	0.0614 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3AA8 #A88D1F

analogous

#1F7FA8 #1F3AA8 #491FA8

triadic

#1F3AA8 #A81F3A #3AA81F

tetradic

#1F3AA8 #A81F7F #A88D1F #1FA849

square

#1F3AA8 #A81F7F #A88D1F #1FA849

split-complementary

#1F3AA8 #A8491F #7FA81F

monochromatic

#0C1641 #152874 #1F3AA8 #2C4ED8 #6079E2

Accessibility & contrast

On white

9.42

#1F3AA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F3AA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3AA8

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3AA8	#FFFFFF	#000000	##FFFFFF
##1F3AA8	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DAB

Deuteranopia (green-blind)

#0040A6

Tritanopia (blue-blind)

#00576B

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f3aa8;
/* rgb */ color: rgb(31, 58, 168);
/* oklch */ color: oklch(40.7% 0.179 266.9);

Tailwind

colors: {
  custom: {
    50: '#7470c3',
    500: '#1f3aa8',
    950: '#000000',
  },
}

SCSS

$custom: #1f3aa8;
$custom-light: #7470c3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3aa8",
  "rgb": {
    "r": 31,
    "g": 58,
    "b": 168
  },
  "hsl": {
    "h": 228.175,
    "s": 68.844,
    "l": 39.02
  },
  "oklch": {
    "l": 0.40697,
    "c": 0.17855,
    "h": 266.9
  },
  "luminance": 0.06145
}

Semantic roles & 50–950 ramp

primary

#1F3AA8

secondary

#C6B15D

accent

#C93CEC

background

#F7F6FC

surface

#EEECF8

border

#C9C7D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #1F3AA8

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

Preview Lab → · Contrast checker → · Palette generator →