#3F66CA#3F66CA

#3F66CA is a mid, vivid blue. Relative luminance 0.148; OKLCH L 53.6% C 0.162 H 265.3°. Best body text is #FFFFFF at 5.30:1 contrast (WCAG AA passes).

Color values

HEX	#3F66CA
RGB	rgb(63, 102, 202)
HSL	hsl(223, 57%, 52%)
HSV	hsv(223, 69%, 79%)
CMYK	cmyk(68.8%, 49.5%, 0%, 20.8%)
CIE-LAB	lab(45.39, 19.61, -56.10)
CIE-LCH	lch(45.39, 59.43, 289.27°)
OKLab	oklab(53.61% -0.0132 -0.161)
OKLCH	oklch(53.61% 0.162 265.3)
XYZ	xyz(17.4582, 14.8220, 57.8065)
Luminance	0.1482 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66CA #CAA33F

analogous

#3FACCA #3F66CA #5D3FCA

triadic

#3F66CA #CA3F66 #66CA3F

tetradic

#3F66CA #CA3FAC #CAA33F #3FCA5D

square

#3F66CA #CA3FAC #CAA33F #3FCA5D

split-complementary

#3F66CA #CA5D3F #ACCA3F

monochromatic

#1F3670 #2C4DA0 #3F66CA #6F8CD7 #9FB2E4

Accessibility & contrast

On white

5.30

#3F66CA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.96

#3F66CA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66CA

5.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66CA	#FFFFFF	#000000	##FFFFFF
##3F66CA	1.00	5.30	3.96	5.30
#FFFFFF	5.30	1.00	21.00	1.00
#000000	3.96	21.00	1.00	21.00
##FFFFFF	5.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D72CE

Deuteranopia (green-blind)

#0065C8

Tritanopia (blue-blind)

#007E8E

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #3f66ca;
/* rgb */ color: rgb(63, 102, 202);
/* oklch */ color: oklch(53.6% 0.162 265.3);

Tailwind

colors: {
  custom: {
    50: '#8491db',
    500: '#3f66ca',
    950: '#000000',
  },
}

SCSS

$custom: #3f66ca;
$custom-light: #8491db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66ca",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 202
  },
  "hsl": {
    "h": 223.165,
    "s": 56.735,
    "l": 51.961
  },
  "oklch": {
    "l": 0.53614,
    "c": 0.16153,
    "h": 265.3
  },
  "luminance": 0.14824
}

Semantic roles & 50–950 ramp

primary

#3F66CA

secondary

#D1C094

accent

#B548E0

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3F66CA

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

Preview Lab → · Contrast checker → · Palette generator →