#3F55C9#3F55C9

#3F55C9 is a mid, vivid blue. Relative luminance 0.118; OKLCH L 50.2% C 0.181 H 270.4°. Best body text is #FFFFFF at 6.26:1 contrast (WCAG AA passes).

Color values

HEX	#3F55C9
RGB	rgb(63, 85, 201)
HSL	hsl(230, 56%, 52%)
HSV	hsv(230, 69%, 79%)
CMYK	cmyk(68.7%, 57.7%, 0%, 21.2%)
CIE-LAB	lab(40.85, 30.11, -62.88)
CIE-LCH	lch(40.85, 69.72, 295.59°)
OKLab	oklab(50.17% 0.0011 -0.1812)
OKLCH	oklch(50.17% 0.181 270.4)
XYZ	xyz(15.8374, 11.7693, 56.6841)
Luminance	0.1177 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55C9 #C9B33F

analogous

#3F9AC9 #3F55C9 #6E3FC9

triadic

#3F55C9 #C93F55 #55C93F

tetradic

#3F55C9 #C93F9A #C9B33F #3FC96E

square

#3F55C9 #C93F9A #C9B33F #3FC96E

split-complementary

#3F55C9 #C96E3F #9AC93F

monochromatic

#1F2C6F #2D3F9E #3F55C9 #6F7FD6 #9FAAE4

Accessibility & contrast

On white

6.26

#3F55C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.35

#3F55C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55C9

6.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55C9	#FFFFFF	#000000	##FFFFFF
##3F55C9	1.00	6.26	3.35	6.26
#FFFFFF	6.26	1.00	21.00	1.00
#000000	3.35	21.00	1.00	21.00
##FFFFFF	6.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0067CD

Deuteranopia (green-blind)

#005AC7

Tritanopia (blue-blind)

#007287

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #3f55c9;
/* rgb */ color: rgb(63, 85, 201);
/* oklch */ color: oklch(50.2% 0.181 270.4);

Tailwind

colors: {
  custom: {
    50: '#8584da',
    500: '#3f55c9',
    950: '#000000',
  },
}

SCSS

$custom: #3f55c9;
$custom-light: #8584da;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55c9",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 201
  },
  "hsl": {
    "h": 230.435,
    "s": 56.098,
    "l": 51.765
  },
  "oklch": {
    "l": 0.50167,
    "c": 0.18117,
    "h": 270.4
  },
  "luminance": 0.11771
}

Semantic roles & 50–950 ramp

primary

#3F55C9

secondary

#D0C794

accent

#C748DF

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3F55C9

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

Preview Lab → · Contrast checker → · Palette generator →