#3729B3#3729B3

#3729B3 is a dark, highly saturated blue. Relative luminance 0.057; OKLCH L 40.5% C 0.204 H 276.7°. Best body text is #FFFFFF at 9.86:1 contrast (WCAG AA passes).

Color values

HEX	#3729B3
RGB	rgb(55, 41, 179)
HSL	hsl(246, 63%, 43%)
HSV	hsv(246, 77%, 70%)
CMYK	cmyk(69.3%, 77.1%, 0%, 29.8%)
CIE-LAB	lab(28.52, 48.05, -70.18)
CIE-LCH	lch(28.52, 85.06, 304.40°)
OKLab	oklab(40.48% 0.0237 -0.2028)
OKLCH	oklch(40.48% 0.204 276.7)
XYZ	xyz(10.5025, 5.6518, 43.1765)
Luminance	0.0565 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3729B3 #A5B329

analogous

#2960B3 #3729B3 #7C29B3

triadic

#3729B3 #B33729 #29B337

tetradic

#3729B3 #B32960 #A5B329 #29B37C

square

#3729B3 #B32960 #A5B329 #29B37C

split-complementary

#3729B3 #B37C29 #60B329

monochromatic

#18124F #281E81 #3729B3 #5345D4 #8177E0

Accessibility & contrast

On white

9.86

#3729B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#3729B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3729B3

9.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3729B3	#FFFFFF	#000000	##FFFFFF
##3729B3	1.00	9.86	2.13	9.86
#FFFFFF	9.86	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049B7

Deuteranopia (green-blind)

#003DB1

Tritanopia (blue-blind)

#00526D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #3729b3;
/* rgb */ color: rgb(55, 41, 179);
/* oklch */ color: oklch(40.5% 0.204 276.7);

Tailwind

colors: {
  custom: {
    50: '#8066cb',
    500: '#3729b3',
    950: '#000000',
  },
}

SCSS

$custom: #3729b3;
$custom-light: #8066cb;
$custom-dark: #000000;

JSON

{
  "hex": "#3729b3",
  "rgb": {
    "r": 55,
    "g": 41,
    "b": 179
  },
  "hsl": {
    "h": 246.087,
    "s": 62.727,
    "l": 43.137
  },
  "oklch": {
    "l": 0.4048,
    "c": 0.20422,
    "h": 276.7
  },
  "luminance": 0.05653
}

Semantic roles & 50–950 ramp

primary

#3729B3

secondary

#BFC770

accent

#E642D5

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0613

muted

#7D7A82

Preview Lab

Preview with #3729B3

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

Preview Lab → · Contrast checker → · Palette generator →