#3F70D3#3F70D3

#3F70D3 is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.3% C 0.162 H 262.6°. Best body text is #FFFFFF at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#3F70D3
RGB	rgb(63, 112, 211)
HSL	hsl(220, 63%, 54%)
HSV	hsv(220, 70%, 83%)
CMYK	cmyk(70.1%, 46.9%, 0%, 17.3%)
CIE-LAB	lab(48.69, 16.54, -55.93)
CIE-LCH	lch(48.69, 58.33, 286.47°)
OKLab	oklab(56.32% -0.0209 -0.1603)
OKLCH	oklch(56.32% 0.162 262.6)
XYZ	xyz(19.5978, 17.3462, 63.9307)
Luminance	0.1735 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70D3 #D3A23F

analogous

#3FBAD3 #3F70D3 #583FD3

triadic

#3F70D3 #D33F70 #70D33F

tetradic

#3F70D3 #D33FBA #D3A23F #3FD358

square

#3F70D3 #D33FBA #D3A23F #3FD358

split-complementary

#3F70D3 #D3583F #BAD33F

monochromatic

#1C3C7B #2854AD #3F70D3 #7195DE #A3BAEA

Accessibility & contrast

On white

4.70

#3F70D3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#3F70D3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70D3

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70D3	#FFFFFF	#000000	##FFFFFF
##3F70D3	1.00	4.70	4.47	4.70
#FFFFFF	4.70	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C7BD7

Deuteranopia (green-blind)

#186DD1

Tritanopia (blue-blind)

#008797

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f70d3;
/* rgb */ color: rgb(63, 112, 211);
/* oklch */ color: oklch(56.3% 0.162 262.6);

Tailwind

colors: {
  custom: {
    50: '#8598e1',
    500: '#3f70d3',
    950: '#000000',
  },
}

SCSS

$custom: #3f70d3;
$custom-light: #8598e1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70d3",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 211
  },
  "hsl": {
    "h": 220.135,
    "s": 62.712,
    "l": 53.725
  },
  "oklch": {
    "l": 0.56324,
    "c": 0.16168,
    "h": 262.6
  },
  "luminance": 0.17348
}

Semantic roles & 50–950 ramp

primary

#3F70D3

secondary

#D7C297

accent

#B042E6

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3F70D3

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

Preview Lab → · Contrast checker → · Palette generator →