#3F55CB#3F55CB

#3F55CB is a mid, vivid blue. Relative luminance 0.119; OKLCH L 50.3% C 0.184 H 270.4°. Best body text is #FFFFFF at 6.23:1 contrast (WCAG AA passes).

Color values

HEX	#3F55CB
RGB	rgb(63, 85, 203)
HSL	hsl(231, 57%, 52%)
HSV	hsv(231, 69%, 80%)
CMYK	cmyk(69%, 58.1%, 0%, 20.4%)
CIE-LAB	lab(41.00, 30.82, -63.79)
CIE-LCH	lch(41.00, 70.84, 295.79°)
OKLab	oklab(50.33% 0.0012 -0.1838)
OKLCH	oklch(50.33% 0.184 270.4)
XYZ	xyz(16.0742, 11.8640, 57.9312)
Luminance	0.1187 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55CB #CBB53F

analogous

#3F9BCB #3F55CB #6F3FCB

triadic

#3F55CB #CB3F55 #55CB3F

tetradic

#3F55CB #CB3F9B #CBB53F #3FCB6F

square

#3F55CB #CB3F9B #CBB53F #3FCB6F

split-complementary

#3F55CB #CB6F3F #9BCB3F

monochromatic

#1F2C71 #2C3EA1 #3F55CB #6F80D8 #9FAAE5

Accessibility & contrast

On white

6.23

#3F55CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.37

#3F55CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55CB

6.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55CB	#FFFFFF	#000000	##FFFFFF
##3F55CB	1.00	6.23	3.37	6.23
#FFFFFF	6.23	1.00	21.00	1.00
#000000	3.37	21.00	1.00	21.00
##FFFFFF	6.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0067CF

Deuteranopia (green-blind)

#005AC9

Tritanopia (blue-blind)

#007288

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3f55cb;
/* rgb */ color: rgb(63, 85, 203);
/* oklch */ color: oklch(50.3% 0.184 270.4);

Tailwind

colors: {
  custom: {
    50: '#8584dc',
    500: '#3f55cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f55cb;
$custom-light: #8584dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55cb",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 203
  },
  "hsl": {
    "h": 230.571,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.50328,
    "c": 0.18384,
    "h": 270.4
  },
  "luminance": 0.11866
}

Semantic roles & 50–950 ramp

primary

#3F55CB

secondary

#D1C894

accent

#C947E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F55CB

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

Preview Lab → · Contrast checker → · Palette generator →