#3866B0#3866B0

#3866B0 is a mid, vivid blue. Relative luminance 0.135; OKLCH L 51.5% C 0.128 H 259.5°. Best body text is #FFFFFF at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#3866B0
RGB	rgb(56, 102, 176)
HSL	hsl(217, 52%, 45%)
HSV	hsv(217, 68%, 69%)
CMYK	cmyk(68.2%, 42%, 0%, 31%)
CIE-LAB	lab(43.47, 9.06, -44.10)
CIE-LCH	lch(43.47, 45.02, 281.61°)
OKLab	oklab(51.54% -0.0233 -0.1258)
OKLCH	oklch(51.54% 0.128 259.5)
XYZ	xyz(14.2159, 13.4767, 42.9179)
Luminance	0.1348 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3866B0 #B08238

analogous

#38A2B0 #3866B0 #4638B0

triadic

#3866B0 #B03866 #66B038

tetradic

#3866B0 #B038A2 #B08238 #38B046

square

#3866B0 #B038A2 #B08238 #38B046

split-complementary

#3866B0 #B04638 #A2B038

monochromatic

#1A3053 #294B82 #3866B0 #5B86CB #89A8D9

Accessibility & contrast

On white

5.68

#3866B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.70

#3866B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3866B0

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3866B0	#FFFFFF	#000000	##FFFFFF
##3866B0	1.00	5.68	3.70	5.68
#FFFFFF	5.68	1.00	21.00	1.00
#000000	3.70	21.00	1.00	21.00
##FFFFFF	5.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#436DB3

Deuteranopia (green-blind)

#3062AE

Tritanopia (blue-blind)

#007782

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3866b0;
/* rgb */ color: rgb(56, 102, 176);
/* oklch */ color: oklch(51.5% 0.128 259.5);

Tailwind

colors: {
  custom: {
    50: '#7c91c8',
    500: '#3866b0',
    950: '#000000',
  },
}

SCSS

$custom: #3866b0;
$custom-light: #7c91c8;
$custom-dark: #000000;

JSON

{
  "hex": "#3866b0",
  "rgb": {
    "r": 56,
    "g": 102,
    "b": 176
  },
  "hsl": {
    "h": 217,
    "s": 51.724,
    "l": 45.49
  },
  "oklch": {
    "l": 0.5154,
    "c": 0.12798,
    "h": 259.5
  },
  "luminance": 0.13478
}

Semantic roles & 50–950 ramp

primary

#3866B0

secondary

#C4AA80

accent

#A54DDB

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3866B0

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

Preview Lab → · Contrast checker → · Palette generator →