#3741B9#3741B9

#3741B9 is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.7% C 0.186 H 272.5°. Best body text is #FFFFFF at 8.02:1 contrast (WCAG AA passes).

Color values

HEX	#3741B9
RGB	rgb(55, 65, 185)
HSL	hsl(235, 54%, 47%)
HSV	hsv(235, 70%, 73%)
CMYK	cmyk(70.3%, 64.9%, 0%, 27.5%)
CIE-LAB	lab(34.18, 36.07, -64.43)
CIE-LCH	lch(34.18, 73.84, 299.24°)
OKLab	oklab(44.72% 0.0083 -0.1861)
OKLCH	oklch(44.72% 0.186 272.5)
XYZ	xyz(12.2199, 8.0944, 46.8079)
Luminance	0.0810 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3741B9 #B9AF37

analogous

#3782B9 #3741B9 #6E37B9

triadic

#3741B9 #B93741 #41B937

tetradic

#3741B9 #B93782 #B9AF37 #37B96E

square

#3741B9 #B93782 #B9AF37 #37B96E

split-complementary

#3741B9 #B96E37 #82B937

monochromatic

#1B205B #29308A #3741B9 #5E67CF #8D93DD

Accessibility & contrast

On white

8.02

#3741B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#3741B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3741B9

8.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3741B9	#FFFFFF	#000000	##FFFFFF
##3741B9	1.00	8.02	2.62	8.02
#FFFFFF	8.02	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056BD

Deuteranopia (green-blind)

#004AB7

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3741b9;
/* rgb */ color: rgb(55, 65, 185);
/* oklch */ color: oklch(44.7% 0.186 272.5);

Tailwind

colors: {
  custom: {
    50: '#7f76cf',
    500: '#3741b9',
    950: '#000000',
  },
}

SCSS

$custom: #3741b9;
$custom-light: #7f76cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3741b9",
  "rgb": {
    "r": 55,
    "g": 65,
    "b": 185
  },
  "hsl": {
    "h": 235.385,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.44716,
    "c": 0.18627,
    "h": 272.5
  },
  "luminance": 0.08096
}

Semantic roles & 50–950 ramp

primary

#3741B9

secondary

#C8C284

accent

#D24ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3741B9

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

Preview Lab → · Contrast checker → · Palette generator →