#3F70BE#3F70BE

#3F70BE is a mid, vivid blue. Relative luminance 0.164; OKLCH L 55.0% C 0.133 H 259.3°. Best body text is #FFFFFF at 4.92:1 contrast (WCAG AA passes).

Color values

HEX	#3F70BE
RGB	rgb(63, 112, 190)
HSL	hsl(217, 50%, 50%)
HSV	hsv(217, 67%, 75%)
CMYK	cmyk(66.8%, 41.1%, 0%, 25.5%)
CIE-LAB	lab(47.44, 8.99, -45.89)
CIE-LCH	lch(47.44, 46.77, 281.08°)
OKLab	oklab(54.96% -0.0247 -0.1308)
OKLCH	oklch(54.96% 0.133 259.3)
XYZ	xyz(17.1350, 16.3611, 50.9602)
Luminance	0.1636 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70BE #BE8D3F

analogous

#3FB0BE #3F70BE #4D3FBE

triadic

#3F70BE #BE3F70 #70BE3F

tetradic

#3F70BE #BE3FB0 #BE8D3F #3FBE4D

square

#3F70BE #BE3FB0 #BE8D3F #3FBE4D

split-complementary

#3F70BE #BE4D3F #B0BE3F

monochromatic

#213A62 #305590 #3F70BE #6C92CE #9AB4DD

Accessibility & contrast

On white

4.92

#3F70BE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.27

#3F70BE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70BE

4.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70BE	#FFFFFF	#000000	##FFFFFF
##3F70BE	1.00	4.92	4.27	4.92
#FFFFFF	4.92	1.00	21.00	1.00
#000000	4.27	21.00	1.00	21.00
##FFFFFF	4.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C77C1

Deuteranopia (green-blind)

#396BBC

Tritanopia (blue-blind)

#00828E

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3f70be;
/* rgb */ color: rgb(63, 112, 190);
/* oklch */ color: oklch(55.0% 0.133 259.3);

Tailwind

colors: {
  custom: {
    50: '#8198d2',
    500: '#3f70be',
    950: '#000000',
  },
}

SCSS

$custom: #3f70be;
$custom-light: #8198d2;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70be",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 190
  },
  "hsl": {
    "h": 216.85,
    "s": 50.198,
    "l": 49.608
  },
  "oklch": {
    "l": 0.54958,
    "c": 0.13314,
    "h": 259.3
  },
  "luminance": 0.16363
}

Semantic roles & 50–950 ramp

primary

#3F70BE

secondary

#C9B38F

accent

#A44EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F70BE

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

Preview Lab → · Contrast checker → · Palette generator →