#3F53BB#3F53BB

#3F53BB is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.7% C 0.165 H 270.8°. Best body text is #FFFFFF at 6.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F53BB
RGB	rgb(63, 83, 187)
HSL	hsl(230, 50%, 49%)
HSV	hsv(230, 66%, 73%)
CMYK	cmyk(66.3%, 55.6%, 0%, 26.7%)
CIE-LAB	lab(39.29, 26.42, -57.25)
CIE-LCH	lch(39.29, 63.05, 294.77°)
OKLab	oklab(48.68% 0.0024 -0.1646)
OKLCH	oklch(48.68% 0.165 270.8)
XYZ	xyz(14.1098, 10.8298, 48.3509)
Luminance	0.1083 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F53BB #BBA73F

analogous

#3F91BB #3F53BB #693FBB

triadic

#3F53BB #BB3F53 #53BB3F

tetradic

#3F53BB #BB3F91 #BBA73F #3FBB69

square

#3F53BB #BB3F91 #BBA73F #3FBB69

split-complementary

#3F53BB #BB693F #91BB3F

monochromatic

#202A5F #303F8D #3F53BB #6A7ACD #98A3DC

Accessibility & contrast

On white

6.63

#3F53BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.17

#3F53BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F53BB

6.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F53BB	#FFFFFF	#000000	##FFFFFF
##3F53BB	1.00	6.63	3.17	6.63
#FFFFFF	6.63	1.00	21.00	1.00
#000000	3.17	21.00	1.00	21.00
##FFFFFF	6.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0062BF

Deuteranopia (green-blind)

#0057B9

Tritanopia (blue-blind)

#006C7F

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #3f53bb;
/* rgb */ color: rgb(63, 83, 187);
/* oklch */ color: oklch(48.7% 0.165 270.8);

Tailwind

colors: {
  custom: {
    50: '#8283d0',
    500: '#3f53bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f53bb;
$custom-light: #8283d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f53bb",
  "rgb": {
    "r": 63,
    "g": 83,
    "b": 187
  },
  "hsl": {
    "h": 230.323,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.48676,
    "c": 0.16467,
    "h": 270.8
  },
  "luminance": 0.10831
}

Semantic roles & 50–950 ramp

primary

#3F53BB

secondary

#C8BF8E

accent

#C34FD9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0A14

muted

#7D7C82

Preview Lab

Preview with #3F53BB

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

Preview Lab → · Contrast checker → · Palette generator →