#3F70DD#3F70DD

#3F70DD is a mid, vivid blue. Relative luminance 0.179; OKLCH L 57.0% C 0.175 H 263.6°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#3F70DD
RGB	rgb(63, 112, 221)
HSL	hsl(221, 70%, 56%)
HSV	hsv(221, 71%, 87%)
CMYK	cmyk(71.5%, 49.3%, 0%, 13.3%)
CIE-LAB	lab(49.33, 20.15, -60.58)
CIE-LCH	lch(49.33, 63.85, 288.40°)
OKLab	oklab(57.02% -0.0195 -0.174)
OKLCH	oklch(57.02% 0.175 263.6)
XYZ	xyz(20.8906, 17.8633, 70.7396)
Luminance	0.1787 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70DD #DDAC3F

analogous

#3FBFDD #3F70DD #5D3FDD

triadic

#3F70DD #DD3F70 #70DD3F

tetradic

#3F70DD #DD3FBF #DDAC3F #3FDD5D

square

#3F70DD #DD3FBF #DDAC3F #3FDD5D

split-complementary

#3F70DD #DD5D3F #BFDD3F

monochromatic

#183B89 #2252BD #3F70DD #7397E6 #A7BDEF

Accessibility & contrast

On white

4.59

#3F70DD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#3F70DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70DD

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70DD	#FFFFFF	#000000	##FFFFFF
##3F70DD	1.00	4.59	4.57	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#307DE1

Deuteranopia (green-blind)

#006EDB

Tritanopia (blue-blind)

#008A9C

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f70dd;
/* rgb */ color: rgb(63, 112, 221);
/* oklch */ color: oklch(57.0% 0.175 263.6);

Tailwind

colors: {
  custom: {
    50: '#8798e8',
    500: '#3f70dd',
    950: '#000000',
  },
}

SCSS

$custom: #3f70dd;
$custom-light: #8798e8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70dd",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 221
  },
  "hsl": {
    "h": 221.392,
    "s": 69.912,
    "l": 55.686
  },
  "oklch": {
    "l": 0.57015,
    "c": 0.1751,
    "h": 263.6
  },
  "luminance": 0.17866
}

Semantic roles & 50–950 ramp

primary

#3F70DD

secondary

#DDC89B

accent

#B63BED

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0D16

muted

#7E7E84

Preview Lab

Preview with #3F70DD

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

Preview Lab → · Contrast checker → · Palette generator →