#3721BB#3721BB

#3721BB is a dark, highly saturated blue. Relative luminance 0.055; OKLCH L 40.4% C 0.220 H 276.5°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#3721BB
RGB	rgb(55, 33, 187)
HSL	hsl(249, 70%, 43%)
HSV	hsv(249, 82%, 73%)
CMYK	cmyk(70.6%, 82.4%, 0%, 26.7%)
CIE-LAB	lab(28.08, 54.30, -75.66)
CIE-LCH	lch(28.08, 93.13, 305.67°)
OKLab	oklab(40.44% 0.0251 -0.2187)
OKLCH	oklch(40.44% 0.22 276.5)
XYZ	xyz(11.0861, 5.4868, 47.4789)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3721BB #A5BB21

analogous

#2158BB #3721BB #8421BB

triadic

#3721BB #BB3721 #21BB37

tetradic

#3721BB #BB2158 #A5BB21 #21BB84

square

#3721BB #BB2158 #A5BB21 #21BB84

split-complementary

#3721BB #BB8421 #58BB21

monochromatic

#180F53 #281887 #3721BB #533DDD #8171E6

Accessibility & contrast

On white

10.01

#3721BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#3721BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3721BB

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3721BB	#FFFFFF	#000000	##FFFFFF
##3721BB	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0048BF

Deuteranopia (green-blind)

#003CB8

Tritanopia (blue-blind)

#005270

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #3721bb;
/* rgb */ color: rgb(55, 33, 187);
/* oklch */ color: oklch(40.4% 0.220 276.5);

Tailwind

colors: {
  custom: {
    50: '#8262d1',
    500: '#3721bb',
    950: '#000000',
  },
}

SCSS

$custom: #3721bb;
$custom-light: #8262d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3721bb",
  "rgb": {
    "r": 55,
    "g": 33,
    "b": 187
  },
  "hsl": {
    "h": 248.571,
    "s": 70,
    "l": 43.137
  },
  "oklch": {
    "l": 0.40435,
    "c": 0.22009,
    "h": 276.5
  },
  "luminance": 0.05488
}

Semantic roles & 50–950 ramp

primary

#3721BB

secondary

#BFCC6B

accent

#ED3BD3

background

#F8F6FD

surface

#F0EBFA

border

#CBC6D3

text

#0C0514

muted

#7D7A83

Preview Lab

Preview with #3721BB

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

Preview Lab → · Contrast checker → · Palette generator →