#3970CB#3970CB

#3970CB is a mid, vivid blue. Relative luminance 0.168; OKLCH L 55.5% C 0.153 H 259.9°. Best body text is #FFFFFF at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#3970CB
RGB	rgb(57, 112, 203)
HSL	hsl(217, 58%, 51%)
HSV	hsv(217, 72%, 80%)
CMYK	cmyk(71.9%, 44.8%, 0%, 20.4%)
CIE-LAB	lab(47.97, 12.78, -52.55)
CIE-LCH	lch(47.97, 54.08, 283.66°)
OKLab	oklab(55.54% -0.0267 -0.1505)
OKLCH	oklch(55.54% 0.153 259.9)
XYZ	xyz(18.2571, 16.7680, 58.7627)
Luminance	0.1677 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3970CB #CB9439

analogous

#39B9CB #3970CB #4B39CB

triadic

#3970CB #CB3970 #70CB39

tetradic

#3970CB #CB39B9 #CB9439 #39CB4B

square

#3970CB #CB39B9 #CB9439 #39CB4B

split-complementary

#3970CB #CB4B39 #B9CB39

monochromatic

#1D3B6D #29559D #3970CB #6993D8 #9AB6E4

Accessibility & contrast

On white

4.82

#3970CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.35

#3970CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3970CB

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3970CB	#FFFFFF	#000000	##FFFFFF
##3970CB	1.00	4.82	4.35	4.82
#FFFFFF	4.82	1.00	21.00	1.00
#000000	4.35	21.00	1.00	21.00
##FFFFFF	4.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4279CE

Deuteranopia (green-blind)

#256CC9

Tritanopia (blue-blind)

#008593

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3970cb;
/* rgb */ color: rgb(57, 112, 203);
/* oklch */ color: oklch(55.5% 0.153 259.9);

Tailwind

colors: {
  custom: {
    50: '#8198db',
    500: '#3970cb',
    950: '#000000',
  },
}

SCSS

$custom: #3970cb;
$custom-light: #8198db;
$custom-dark: #000000;

JSON

{
  "hex": "#3970cb",
  "rgb": {
    "r": 57,
    "g": 112,
    "b": 203
  },
  "hsl": {
    "h": 217.397,
    "s": 58.4,
    "l": 50.98
  },
  "oklch": {
    "l": 0.55542,
    "c": 0.15283,
    "h": 259.9
  },
  "luminance": 0.1677
}

Semantic roles & 50–950 ramp

primary

#3970CB

secondary

#D0B890

accent

#A746E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3970CB

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

Preview Lab → · Contrast checker → · Palette generator →