#1F40B3#1F40B3

#1F40B3 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.9% C 0.186 H 266.0°. Best body text is #FFFFFF at 8.60:1 contrast (WCAG AA passes).

Color values

HEX	#1F40B3
RGB	rgb(31, 64, 179)
HSL	hsl(227, 70%, 41%)
HSV	hsv(227, 83%, 70%)
CMYK	cmyk(82.7%, 64.2%, 0%, 29.8%)
CIE-LAB	lab(32.28, 32.04, -64.03)
CIE-LCH	lch(32.28, 71.60, 296.58°)
OKLab	oklab(42.86% -0.0131 -0.1854)
OKLCH	oklch(42.86% 0.186 266)
XYZ	xyz(10.5323, 7.2115, 43.4759)
Luminance	0.0721 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F40B3 #B3921F

analogous

#1F8AB3 #1F40B3 #481FB3

triadic

#1F40B3 #B31F40 #40B31F

tetradic

#1F40B3 #B31F8A #B3921F #1FB348

square

#1F40B3 #B31F8A #B3921F #1FB348

split-complementary

#1F40B3 #B3481F #8AB31F

monochromatic

#0D1B4B #162D7F #1F40B3 #3359DC #6884E5

Accessibility & contrast

On white

8.60

#1F40B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#1F40B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F40B3

8.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F40B3	#FFFFFF	#000000	##FFFFFF
##1F40B3	1.00	8.60	2.44	8.60
#FFFFFF	8.60	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B7

Deuteranopia (green-blind)

#0045B1

Tritanopia (blue-blind)

#005F73

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #1f40b3;
/* rgb */ color: rgb(31, 64, 179);
/* oklch */ color: oklch(42.9% 0.186 266.0);

Tailwind

colors: {
  custom: {
    50: '#7674cb',
    500: '#1f40b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f40b3;
$custom-light: #7674cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f40b3",
  "rgb": {
    "r": 31,
    "g": 64,
    "b": 179
  },
  "hsl": {
    "h": 226.622,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.42855,
    "c": 0.18586,
    "h": 266
  },
  "luminance": 0.07213
}

Semantic roles & 50–950 ramp

primary

#1F40B3

secondary

#CAB364

accent

#C53BED

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F40B3

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

Preview Lab → · Contrast checker → · Palette generator →