#3F70BD#3F70BD

#3F70BD is a mid, vivid blue. Relative luminance 0.163; OKLCH L 54.9% C 0.132 H 259.1°. Best body text is #FFFFFF at 4.93:1 contrast (WCAG AA passes).

Color values

HEX	#3F70BD
RGB	rgb(63, 112, 189)
HSL	hsl(217, 50%, 49%)
HSV	hsv(217, 67%, 74%)
CMYK	cmyk(66.7%, 40.7%, 0%, 25.9%)
CIE-LAB	lab(47.39, 8.63, -45.41)
CIE-LCH	lch(47.39, 46.22, 280.76°)
OKLab	oklab(54.9% -0.0249 -0.1294)
OKLCH	oklch(54.9% 0.132 259.1)
XYZ	xyz(17.0261, 16.3175, 50.3866)
Luminance	0.1632 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70BD #BD8C3F

analogous

#3FAFBD #3F70BD #4D3FBD

triadic

#3F70BD #BD3F70 #70BD3F

tetradic

#3F70BD #BD3FAF #BD8C3F #3FBD4D

square

#3F70BD #BD3FAF #BD8C3F #3FBD4D

split-complementary

#3F70BD #BD4D3F #AFBD3F

monochromatic

#203A61 #30558F #3F70BD #6B92CE #99B4DD

Accessibility & contrast

On white

4.93

#3F70BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.26

#3F70BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70BD

4.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70BD	#FFFFFF	#000000	##FFFFFF
##3F70BD	1.00	4.93	4.26	4.93
#FFFFFF	4.93	1.00	21.00	1.00
#000000	4.26	21.00	1.00	21.00
##FFFFFF	4.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D77C0

Deuteranopia (green-blind)

#3A6BBB

Tritanopia (blue-blind)

#00828D

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3f70bd;
/* rgb */ color: rgb(63, 112, 189);
/* oklch */ color: oklch(54.9% 0.132 259.1);

Tailwind

colors: {
  custom: {
    50: '#8198d1',
    500: '#3f70bd',
    950: '#000000',
  },
}

SCSS

$custom: #3f70bd;
$custom-light: #8198d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70bd",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 189
  },
  "hsl": {
    "h": 216.667,
    "s": 50,
    "l": 49.412
  },
  "oklch": {
    "l": 0.54896,
    "c": 0.13177,
    "h": 259.1
  },
  "luminance": 0.16319
}

Semantic roles & 50–950 ramp

primary

#3F70BD

secondary

#C9B28F

accent

#A34EDA

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F70BD

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

Preview Lab → · Contrast checker → · Palette generator →