#3743BB#3743BB

#3743BB is a mid, vivid blue. Relative luminance 0.084; OKLCH L 45.2% C 0.187 H 272.1°. Best body text is #FFFFFF at 7.83:1 contrast (WCAG AA passes).

Color values

HEX	#3743BB
RGB	rgb(55, 67, 187)
HSL	hsl(235, 55%, 47%)
HSV	hsv(235, 71%, 73%)
CMYK	cmyk(70.6%, 64.2%, 0%, 26.7%)
CIE-LAB	lab(34.83, 35.51, -64.54)
CIE-LCH	lch(34.83, 73.67, 298.82°)
OKLab	oklab(45.25% 0.0067 -0.1864)
OKLCH	oklch(45.25% 0.187 272.1)
XYZ	xyz(12.5493, 8.4132, 47.9666)
Luminance	0.0841 (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

#3743BB #BBAF37

analogous

#3785BB #3743BB #6D37BB

triadic

#3743BB #BB3743 #43BB37

tetradic

#3743BB #BB3785 #BBAF37 #37BB6D

square

#3743BB #BB3785 #BBAF37 #37BB6D

split-complementary

#3743BB #BB6D37 #85BB37

monochromatic

#1B215C #29328C #3743BB #5F69D0 #8E96DE

Accessibility & contrast

On white

7.83

#3743BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.68

#3743BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3743BB

7.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3743BB	#FFFFFF	#000000	##FFFFFF
##3743BB	1.00	7.83	2.68	7.83
#FFFFFF	7.83	1.00	21.00	1.00
#000000	2.68	21.00	1.00	21.00
##FFFFFF	7.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058BF

Deuteranopia (green-blind)

#004CB9

Tritanopia (blue-blind)

#006279

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #3743bb;
/* rgb */ color: rgb(55, 67, 187);
/* oklch */ color: oklch(45.2% 0.187 272.1);

Tailwind

colors: {
  custom: {
    50: '#8077d0',
    500: '#3743bb',
    950: '#000000',
  },
}

SCSS

$custom: #3743bb;
$custom-light: #8077d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3743bb",
  "rgb": {
    "r": 55,
    "g": 67,
    "b": 187
  },
  "hsl": {
    "h": 234.545,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.45246,
    "c": 0.18653,
    "h": 272.1
  },
  "luminance": 0.08414
}

Semantic roles & 50–950 ramp

primary

#3743BB

secondary

#C9C285

accent

#D04ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3743BB

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

Preview Lab → · Contrast checker → · Palette generator →