#3870CB#3870CB

#3870CB is a mid, vivid blue. Relative luminance 0.167; OKLCH L 55.5% C 0.153 H 259.7°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#3870CB
RGB	rgb(56, 112, 203)
HSL	hsl(217, 59%, 51%)
HSV	hsv(217, 72%, 80%)
CMYK	cmyk(72.4%, 44.8%, 0%, 20.4%)
CIE-LAB	lab(47.93, 12.64, -52.61)
CIE-LCH	lch(47.93, 54.10, 283.51°)
OKLab	oklab(55.5% -0.0275 -0.1507)
OKLCH	oklch(55.5% 0.153 259.7)
XYZ	xyz(18.2007, 16.7389, 58.7600)
Luminance	0.1674 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3870CB #CB9338

analogous

#38B9CB #3870CB #4938CB

triadic

#3870CB #CB3870 #70CB38

tetradic

#3870CB #CB38B9 #CB9338 #38CB49

square

#3870CB #CB38B9 #CB9338 #38CB49

split-complementary

#3870CB #CB4938 #B9CB38

monochromatic

#1C3B6C #29559D #3870CB #6993D8 #99B6E4

Accessibility & contrast

On white

4.83

#3870CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.35

#3870CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3870CB

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3870CB	#FFFFFF	#000000	##FFFFFF
##3870CB	1.00	4.83	4.35	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.35	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4279CE

Deuteranopia (green-blind)

#246BC9

Tritanopia (blue-blind)

#008593

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3870cb;
/* rgb */ color: rgb(56, 112, 203);
/* oklch */ color: oklch(55.5% 0.153 259.7);

Tailwind

colors: {
  custom: {
    50: '#8198db',
    500: '#3870cb',
    950: '#000000',
  },
}

SCSS

$custom: #3870cb;
$custom-light: #8198db;
$custom-dark: #000000;

JSON

{
  "hex": "#3870cb",
  "rgb": {
    "r": 56,
    "g": 112,
    "b": 203
  },
  "hsl": {
    "h": 217.143,
    "s": 58.566,
    "l": 50.784
  },
  "oklch": {
    "l": 0.55503,
    "c": 0.15314,
    "h": 259.7
  },
  "luminance": 0.16741
}

Semantic roles & 50–950 ramp

primary

#3870CB

secondary

#D0B78F

accent

#A646E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3870CB

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

Preview Lab → · Contrast checker → · Palette generator →