#3F57CA#3F57CA

#3F57CA is a mid, vivid blue. Relative luminance 0.121; OKLCH L 50.6% C 0.180 H 269.9°. Best body text is #FFFFFF at 6.13:1 contrast (WCAG AA passes).

Color values

HEX	#3F57CA
RGB	rgb(63, 87, 202)
HSL	hsl(230, 57%, 52%)
HSV	hsv(230, 69%, 79%)
CMYK	cmyk(68.8%, 56.9%, 0%, 20.8%)
CIE-LAB	lab(41.43, 29.19, -62.51)
CIE-LCH	lch(41.43, 68.99, 295.03°)
OKLab	oklab(50.63% -0.0005 -0.18)
OKLCH	oklch(50.63% 0.18 269.9)
XYZ	xyz(16.1151, 12.1358, 57.3588)
Luminance	0.1214 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57CA #CAB23F

analogous

#3F9DCA #3F57CA #6C3FCA

triadic

#3F57CA #CA3F57 #57CA3F

tetradic

#3F57CA #CA3F9D #CAB23F #3FCA6C

square

#3F57CA #CA3F9D #CAB23F #3FCA6C

split-complementary

#3F57CA #CA6C3F #9DCA3F

monochromatic

#1F2D70 #2C40A0 #3F57CA #6F81D7 #9FABE4

Accessibility & contrast

On white

6.13

#3F57CA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.43

#3F57CA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57CA

6.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57CA	#FFFFFF	#000000	##FFFFFF
##3F57CA	1.00	6.13	3.43	6.13
#FFFFFF	6.13	1.00	21.00	1.00
#000000	3.43	21.00	1.00	21.00
##FFFFFF	6.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CE

Deuteranopia (green-blind)

#005CC8

Tritanopia (blue-blind)

#007388

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #3f57ca;
/* rgb */ color: rgb(63, 87, 202);
/* oklch */ color: oklch(50.6% 0.180 269.9);

Tailwind

colors: {
  custom: {
    50: '#8586db',
    500: '#3f57ca',
    950: '#000000',
  },
}

SCSS

$custom: #3f57ca;
$custom-light: #8586db;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57ca",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 202
  },
  "hsl": {
    "h": 229.64,
    "s": 56.735,
    "l": 51.961
  },
  "oklch": {
    "l": 0.50626,
    "c": 0.18005,
    "h": 269.9
  },
  "luminance": 0.12137
}

Semantic roles & 50–950 ramp

primary

#3F57CA

secondary

#D1C694

accent

#C648E0

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F57CA

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

Preview Lab → · Contrast checker → · Palette generator →