#3F55BB#3F55BB

#3F55BB is a mid, vivid blue. Relative luminance 0.111; OKLCH L 49.1% C 0.162 H 270.2°. Best body text is #FFFFFF at 6.50:1 contrast (WCAG AA passes).

Color values

HEX	#3F55BB
RGB	rgb(63, 85, 187)
HSL	hsl(229, 50%, 49%)
HSV	hsv(229, 66%, 73%)
CMYK	cmyk(66.3%, 54.5%, 0%, 26.7%)
CIE-LAB	lab(39.82, 25.13, -56.41)
CIE-LCH	lch(39.82, 61.75, 294.01°)
OKLab	oklab(49.07% 0.0006 -0.1621)
OKLCH	oklch(49.07% 0.162 270.2)
XYZ	xyz(14.2650, 11.1403, 48.4026)
Luminance	0.1114 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F55BB #BBA53F

analogous

#3F93BB #3F55BB #673FBB

triadic

#3F55BB #BB3F55 #55BB3F

tetradic

#3F55BB #BB3F93 #BBA53F #3FBB67

square

#3F55BB #BB3F93 #BBA53F #3FBB67

split-complementary

#3F55BB #BB673F #93BB3F

monochromatic

#202B5F #30408D #3F55BB #6A7CCD #98A4DC

Accessibility & contrast

On white

6.50

#3F55BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.23

#3F55BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F55BB

6.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F55BB	#FFFFFF	#000000	##FFFFFF
##3F55BB	1.00	6.50	3.23	6.50
#FFFFFF	6.50	1.00	21.00	1.00
#000000	3.23	21.00	1.00	21.00
##FFFFFF	6.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0564BF

Deuteranopia (green-blind)

#0058B9

Tritanopia (blue-blind)

#006D80

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f55bb;
/* rgb */ color: rgb(63, 85, 187);
/* oklch */ color: oklch(49.1% 0.162 270.2);

Tailwind

colors: {
  custom: {
    50: '#8284d0',
    500: '#3f55bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f55bb;
$custom-light: #8284d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f55bb",
  "rgb": {
    "r": 63,
    "g": 85,
    "b": 187
  },
  "hsl": {
    "h": 229.355,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.49069,
    "c": 0.16213,
    "h": 270.2
  },
  "luminance": 0.11142
}

Semantic roles & 50–950 ramp

primary

#3F55BB

secondary

#C8BE8E

accent

#C14FD9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F55BB

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

Preview Lab → · Contrast checker → · Palette generator →