#3F70D9#3F70D9

#3F70D9 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.7% C 0.170 H 263.2°. Best body text is #FFFFFF at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F70D9
RGB	rgb(63, 112, 217)
HSL	hsl(221, 67%, 55%)
HSV	hsv(221, 71%, 85%)
CMYK	cmyk(71%, 48.4%, 0%, 14.9%)
CIE-LAB	lab(49.07, 18.71, -58.73)
CIE-LCH	lch(49.07, 61.64, 287.67°)
OKLab	oklab(56.74% -0.02 -0.1686)
OKLCH	oklch(56.74% 0.17 263.2)
XYZ	xyz(20.3640, 17.6527, 67.9663)
Luminance	0.1766 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70D9 #D9A83F

analogous

#3FBDD9 #3F70D9 #5B3FD9

triadic

#3F70D9 #D93F70 #70D93F

tetradic

#3F70D9 #D93FBD #D9A83F #3FD95B

square

#3F70D9 #D93FBD #D9A83F #3FD95B

split-complementary

#3F70D9 #D95B3F #BDD93F

monochromatic

#1A3C84 #2453B7 #3F70D9 #7296E3 #A5BCED

Accessibility & contrast

On white

4.63

#3F70D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#3F70D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70D9

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70D9	#FFFFFF	#000000	##FFFFFF
##3F70D9	1.00	4.63	4.53	4.63
#FFFFFF	4.63	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#357CDD

Deuteranopia (green-blind)

#006ED7

Tritanopia (blue-blind)

#00899A

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f70d9;
/* rgb */ color: rgb(63, 112, 217);
/* oklch */ color: oklch(56.7% 0.170 263.2);

Tailwind

colors: {
  custom: {
    50: '#8698e5',
    500: '#3f70d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f70d9;
$custom-light: #8698e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70d9",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 217
  },
  "hsl": {
    "h": 220.909,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.56735,
    "c": 0.16976,
    "h": 263.2
  },
  "luminance": 0.17655
}

Semantic roles & 50–950 ramp

primary

#3F70D9

secondary

#DAC69A

accent

#B33EEA

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0D0D16

muted

#7D7E84

Preview Lab

Preview with #3F70D9

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

Preview Lab → · Contrast checker → · Palette generator →