#3F66B2#3F66B2

#3F66B2 is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.0% C 0.128 H 262.4°. Best body text is #FFFFFF at 5.59:1 contrast (WCAG AA passes).

Color values

HEX	#3F66B2
RGB	rgb(63, 102, 178)
HSL	hsl(220, 48%, 47%)
HSV	hsv(220, 65%, 70%)
CMYK	cmyk(64.6%, 42.7%, 0%, 30.2%)
CIE-LAB	lab(43.90, 10.99, -44.57)
CIE-LCH	lch(43.90, 45.90, 283.86°)
OKLab	oklab(52% -0.017 -0.1271)
OKLCH	oklch(52% 0.128 262.4)
XYZ	xyz(14.8343, 13.7725, 43.9874)
Luminance	0.1377 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66B2 #B28B3F

analogous

#3FA0B2 #3F66B2 #513FB2

triadic

#3F66B2 #B23F66 #66B23F

tetradic

#3F66B2 #B23FA0 #B28B3F #3FB251

square

#3F66B2 #B23FA0 #B28B3F #3FB251

split-complementary

#3F66B2 #B2513F #A0B23F

monochromatic

#1F3258 #2F4C85 #3F66B2 #6687C9 #93AAD9

Accessibility & contrast

On white

5.59

#3F66B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.75

#3F66B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66B2

5.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66B2	#FFFFFF	#000000	##FFFFFF
##3F66B2	1.00	5.59	3.75	5.59
#FFFFFF	5.59	1.00	21.00	1.00
#000000	3.75	21.00	1.00	21.00
##FFFFFF	5.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#436DB5

Deuteranopia (green-blind)

#3163B0

Tritanopia (blue-blind)

#007783

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3f66b2;
/* rgb */ color: rgb(63, 102, 178);
/* oklch */ color: oklch(52.0% 0.128 262.4);

Tailwind

colors: {
  custom: {
    50: '#7f91c9',
    500: '#3f66b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f66b2;
$custom-light: #7f91c9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66b2",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 178
  },
  "hsl": {
    "h": 219.652,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.51998,
    "c": 0.12821,
    "h": 262.4
  },
  "luminance": 0.13774
}

Semantic roles & 50–950 ramp

primary

#3F66B2

secondary

#C4B089

accent

#AA50D7

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3F66B2

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

Preview Lab → · Contrast checker → · Palette generator →