#3F59CB#3F59CB

#3F59CB is a mid, vivid blue. Relative luminance 0.125; OKLCH L 51.1% C 0.179 H 269.3°. Best body text is #FFFFFF at 6.00:1 contrast (WCAG AA passes).

Color values

HEX	#3F59CB
RGB	rgb(63, 89, 203)
HSL	hsl(229, 57%, 52%)
HSV	hsv(229, 69%, 80%)
CMYK	cmyk(69%, 56.2%, 0%, 20.4%)
CIE-LAB	lab(42.02, 28.27, -62.13)
CIE-LCH	lch(42.02, 68.26, 294.47°)
OKLab	oklab(51.09% -0.0021 -0.1789)
OKLCH	oklch(51.09% 0.179 269.3)
XYZ	xyz(16.3981, 12.5117, 58.0391)
Luminance	0.1251 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F59CB #CBB13F

analogous

#3F9FCB #3F59CB #6B3FCB

triadic

#3F59CB #CB3F59 #59CB3F

tetradic

#3F59CB #CB3F9F #CBB13F #3FCB6B

square

#3F59CB #CB3F9F #CBB13F #3FCB6B

split-complementary

#3F59CB #CB6B3F #9FCB3F

monochromatic

#1F2E71 #2C41A1 #3F59CB #6F83D8 #9FACE5

Accessibility & contrast

On white

6.00

#3F59CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.50

#3F59CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F59CB

6.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F59CB	#FFFFFF	#000000	##FFFFFF
##3F59CB	1.00	6.00	3.50	6.00
#FFFFFF	6.00	1.00	21.00	1.00
#000000	3.50	21.00	1.00	21.00
##FFFFFF	6.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006ACF

Deuteranopia (green-blind)

#005DC9

Tritanopia (blue-blind)

#007589

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #3f59cb;
/* rgb */ color: rgb(63, 89, 203);
/* oklch */ color: oklch(51.1% 0.179 269.3);

Tailwind

colors: {
  custom: {
    50: '#8587dc',
    500: '#3f59cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f59cb;
$custom-light: #8587dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f59cb",
  "rgb": {
    "r": 63,
    "g": 89,
    "b": 203
  },
  "hsl": {
    "h": 228.857,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.51089,
    "c": 0.17893,
    "h": 269.3
  },
  "luminance": 0.12513
}

Semantic roles & 50–950 ramp

primary

#3F59CB

secondary

#D1C694

accent

#C447E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F59CB

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

Preview Lab → · Contrast checker → · Palette generator →