#3F70C8#3F70C8

#3F70C8 is a mid, vivid blue. Relative luminance 0.168; OKLCH L 55.6% C 0.147 H 261.1°. Best body text is #FFFFFF at 4.81:1 contrast (WCAG AA passes).

Color values

HEX	#3F70C8
RGB	rgb(63, 112, 200)
HSL	hsl(219, 55%, 52%)
HSV	hsv(219, 69%, 78%)
CMYK	cmyk(68.5%, 44%, 0%, 21.6%)
CIE-LAB	lab(48.02, 12.57, -50.72)
CIE-LCH	lch(48.02, 52.26, 283.92°)
OKLab	oklab(55.59% -0.0227 -0.145)
OKLCH	oklch(55.59% 0.147 261.1)
XYZ	xyz(18.2657, 16.8134, 56.9151)
Luminance	0.1681 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70C8 #C8973F

analogous

#3FB5C8 #3F70C8 #533FC8

triadic

#3F70C8 #C83F70 #70C83F

tetradic

#3F70C8 #C83FB5 #C8973F #3FC853

square

#3F70C8 #C83FB5 #C8973F #3FC853

split-complementary

#3F70C8 #C8533F #B5C83F

monochromatic

#1F3B6D #2D559D #3F70C8 #6F93D6 #9EB7E3

Accessibility & contrast

On white

4.81

#3F70C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.36

#3F70C8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70C8

4.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70C8	#FFFFFF	#000000	##FFFFFF
##3F70C8	1.00	4.81	4.36	4.81
#FFFFFF	4.81	1.00	21.00	1.00
#000000	4.36	21.00	1.00	21.00
##FFFFFF	4.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4579CB

Deuteranopia (green-blind)

#2D6CC6

Tritanopia (blue-blind)

#008492

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f70c8;
/* rgb */ color: rgb(63, 112, 200);
/* oklch */ color: oklch(55.6% 0.147 261.1);

Tailwind

colors: {
  custom: {
    50: '#8398d9',
    500: '#3f70c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f70c8;
$custom-light: #8398d9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70c8",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 200
  },
  "hsl": {
    "h": 218.54,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.55594,
    "c": 0.14678,
    "h": 261.1
  },
  "luminance": 0.16815
}

Semantic roles & 50–950 ramp

primary

#3F70C8

secondary

#D0BA93

accent

#A949DF

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3F70C8

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

Preview Lab → · Contrast checker → · Palette generator →