#3F70BF#3F70BF

#3F70BF is a mid, vivid blue. Relative luminance 0.164; OKLCH L 55.0% C 0.135 H 259.5°. Best body text is #FFFFFF at 4.90:1 contrast (WCAG AA passes).

Color values

HEX	#3F70BF
RGB	rgb(63, 112, 191)
HSL	hsl(217, 50%, 50%)
HSV	hsv(217, 67%, 75%)
CMYK	cmyk(67%, 41.4%, 0%, 25.1%)
CIE-LAB	lab(47.50, 9.35, -46.38)
CIE-LCH	lch(47.50, 47.31, 281.39°)
OKLab	oklab(55.02% -0.0245 -0.1323)
OKLCH	oklch(55.02% 0.135 259.5)
XYZ	xyz(17.2447, 16.4050, 51.5378)
Luminance	0.1641 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70BF #BF8E3F

analogous

#3FB0BF #3F70BF #4E3FBF

triadic

#3F70BF #BF3F70 #70BF3F

tetradic

#3F70BF #BF3FB0 #BF8E3F #3FBF4E

square

#3F70BF #BF3FB0 #BF8E3F #3FBF4E

split-complementary

#3F70BF #BF4E3F #B0BF3F

monochromatic

#213A63 #305591 #3F70BF #6D92CF #9BB4DE

Accessibility & contrast

On white

4.90

#3F70BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.28

#3F70BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70BF

4.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70BF	#FFFFFF	#000000	##FFFFFF
##3F70BF	1.00	4.90	4.28	4.90
#FFFFFF	4.90	1.00	21.00	1.00
#000000	4.28	21.00	1.00	21.00
##FFFFFF	4.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C77C2

Deuteranopia (green-blind)

#386BBD

Tritanopia (blue-blind)

#00828E

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f70bf;
/* rgb */ color: rgb(63, 112, 191);
/* oklch */ color: oklch(55.0% 0.135 259.5);

Tailwind

colors: {
  custom: {
    50: '#8298d3',
    500: '#3f70bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f70bf;
$custom-light: #8298d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70bf",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 191
  },
  "hsl": {
    "h": 217.031,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.55021,
    "c": 0.1345,
    "h": 259.5
  },
  "luminance": 0.16407
}

Semantic roles & 50–950 ramp

primary

#3F70BF

secondary

#CAB490

accent

#A44EDA

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0B0D14

muted

#7C7E83

Preview Lab

Preview with #3F70BF

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

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