#3970CF#3970CF

#3970CF is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.8% C 0.158 H 260.5°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#3970CF
RGB	rgb(57, 112, 207)
HSL	hsl(218, 61%, 52%)
HSV	hsv(218, 72%, 81%)
CMYK	cmyk(72.5%, 45.9%, 0%, 18.8%)
CIE-LAB	lab(48.21, 14.24, -54.44)
CIE-LCH	lch(48.21, 56.27, 284.66°)
OKLab	oklab(55.81% -0.026 -0.156)
OKLCH	oklch(55.81% 0.158 260.5)
XYZ	xyz(18.7399, 16.9612, 61.3056)
Luminance	0.1696 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3970CF #CF9839

analogous

#39BBCF #3970CF #4D39CF

triadic

#3970CF #CF3970 #70CF39

tetradic

#3970CF #CF39BB #CF9839 #39CF4D

square

#3970CF #CF39BB #CF9839 #39CF4D

split-complementary

#3970CF #CF4D39 #BBCF39

monochromatic

#1C3B72 #2855A3 #3970CF #6A94DB #9CB7E7

Accessibility & contrast

On white

4.78

#3970CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#3970CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3970CF

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3970CF	#FFFFFF	#000000	##FFFFFF
##3970CF	1.00	4.78	4.39	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F7AD3

Deuteranopia (green-blind)

#1D6CCD

Tritanopia (blue-blind)

#008695

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3970cf;
/* rgb */ color: rgb(57, 112, 207);
/* oklch */ color: oklch(55.8% 0.158 260.5);

Tailwind

colors: {
  custom: {
    50: '#8298de',
    500: '#3970cf',
    950: '#000000',
  },
}

SCSS

$custom: #3970cf;
$custom-light: #8298de;
$custom-dark: #000000;

JSON

{
  "hex": "#3970cf",
  "rgb": {
    "r": 57,
    "g": 112,
    "b": 207
  },
  "hsl": {
    "h": 218,
    "s": 60.976,
    "l": 51.765
  },
  "oklch": {
    "l": 0.55809,
    "c": 0.1582,
    "h": 260.5
  },
  "luminance": 0.16963
}

Semantic roles & 50–950 ramp

primary

#3970CF

secondary

#D3BB91

accent

#A944E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3970CF

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

Preview Lab → · Contrast checker → · Palette generator →