#3742BB#3742BB

#3742BB is a mid, vivid blue. Relative luminance 0.083; OKLCH L 45.1% C 0.188 H 272.3°. Best body text is #FFFFFF at 7.90:1 contrast (WCAG AA passes).

Color values

HEX	#3742BB
RGB	rgb(55, 66, 187)
HSL	hsl(235, 55%, 47%)
HSV	hsv(235, 71%, 73%)
CMYK	cmyk(70.6%, 64.7%, 0%, 26.7%)
CIE-LAB	lab(34.59, 36.14, -64.93)
CIE-LCH	lch(34.59, 74.31, 299.10°)
OKLab	oklab(45.07% 0.0074 -0.1876)
OKLCH	oklch(45.07% 0.188 272.3)
XYZ	xyz(12.4904, 8.2953, 47.9470)
Luminance	0.0830 (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

#3742BB #BBB037

analogous

#3784BB #3742BB #6E37BB

triadic

#3742BB #BB3742 #42BB37

tetradic

#3742BB #BB3784 #BBB037 #37BB6E

square

#3742BB #BB3784 #BBB037 #37BB6E

split-complementary

#3742BB #BB6E37 #84BB37

monochromatic

#1B215C #29318C #3742BB #5F69D0 #8E95DE

Accessibility & contrast

On white

7.90

#3742BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.66

#3742BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3742BB

7.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3742BB	#FFFFFF	#000000	##FFFFFF
##3742BB	1.00	7.90	2.66	7.90
#FFFFFF	7.90	1.00	21.00	1.00
#000000	2.66	21.00	1.00	21.00
##FFFFFF	7.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0058BF

Deuteranopia (green-blind)

#004BB9

Tritanopia (blue-blind)

#006278

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3742bb;
/* rgb */ color: rgb(55, 66, 187);
/* oklch */ color: oklch(45.1% 0.188 272.3);

Tailwind

colors: {
  custom: {
    50: '#8076d0',
    500: '#3742bb',
    950: '#000000',
  },
}

SCSS

$custom: #3742bb;
$custom-light: #8076d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3742bb",
  "rgb": {
    "r": 55,
    "g": 66,
    "b": 187
  },
  "hsl": {
    "h": 235,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.45071,
    "c": 0.18771,
    "h": 272.3
  },
  "luminance": 0.08297
}

Semantic roles & 50–950 ramp

primary

#3742BB

secondary

#C9C385

accent

#D24ADE

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3742BB

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

Preview Lab → · Contrast checker → · Palette generator →