#1F40B4#1F40B4

#1F40B4 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 42.9% C 0.187 H 266.0°. Best body text is #FFFFFF at 8.57:1 contrast (WCAG AA passes).

Color values

HEX	#1F40B4
RGB	rgb(31, 64, 180)
HSL	hsl(227, 71%, 41%)
HSV	hsv(227, 83%, 71%)
CMYK	cmyk(82.8%, 64.4%, 0%, 29.4%)
CIE-LAB	lab(32.37, 32.42, -64.47)
CIE-LCH	lch(32.37, 72.16, 296.69°)
OKLab	oklab(42.95% -0.0131 -0.1867)
OKLCH	oklch(42.95% 0.187 266)
XYZ	xyz(10.6338, 7.2521, 44.0105)
Luminance	0.0725 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F40B4 #B4931F

analogous

#1F8BB4 #1F40B4 #481FB4

triadic

#1F40B4 #B41F40 #40B41F

tetradic

#1F40B4 #B41F8B #B4931F #1FB448

square

#1F40B4 #B41F8B #B4931F #1FB448

split-complementary

#1F40B4 #B4481F #8BB41F

monochromatic

#0D1B4C #162D80 #1F40B4 #3459DC #6884E5

Accessibility & contrast

On white

8.57

#1F40B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#1F40B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F40B4

8.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F40B4	#FFFFFF	#000000	##FFFFFF
##1F40B4	1.00	8.57	2.45	8.57
#FFFFFF	8.57	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B8

Deuteranopia (green-blind)

#0045B2

Tritanopia (blue-blind)

#005F74

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #1f40b4;
/* rgb */ color: rgb(31, 64, 180);
/* oklch */ color: oklch(42.9% 0.187 266.0);

Tailwind

colors: {
  custom: {
    50: '#7674cb',
    500: '#1f40b4',
    950: '#000000',
  },
}

SCSS

$custom: #1f40b4;
$custom-light: #7674cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f40b4",
  "rgb": {
    "r": 31,
    "g": 64,
    "b": 180
  },
  "hsl": {
    "h": 226.711,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.42949,
    "c": 0.18716,
    "h": 266
  },
  "luminance": 0.07253
}

Semantic roles & 50–950 ramp

primary

#1F40B4

secondary

#CBB464

accent

#C63AED

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F40B4

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

Preview Lab → · Contrast checker → · Palette generator →