#3F42D9#3F42D9

#3F42D9 is a mid, highly saturated blue. Relative luminance 0.100; OKLCH L 48.3% C 0.223 H 273.4°. Best body text is #FFFFFF at 7.02:1 contrast (WCAG AA passes).

Color values

HEX	#3F42D9
RGB	rgb(63, 66, 217)
HSL	hsl(239, 67%, 55%)
HSV	hsv(239, 71%, 85%)
CMYK	cmyk(71%, 69.6%, 0%, 14.9%)
CIE-LAB	lab(37.77, 47.25, -77.13)
CIE-LCH	lch(37.77, 90.45, 301.49°)
OKLab	oklab(48.33% 0.0132 -0.223)
OKLCH	oklch(48.33% 0.223 273.4)
XYZ	xyz(16.5183, 9.9613, 66.6844)
Luminance	0.0996 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue (survey)

#0343DF

ΔE00 3.14

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F42D9 #D9D63F

analogous

#3F8FD9 #3F42D9 #893FD9

triadic

#3F42D9 #D93F42 #42D93F

tetradic

#3F42D9 #D93F8F #D9D63F #3FD989

square

#3F42D9 #D93F8F #D9D63F #3FD989

split-complementary

#3F42D9 #D9893F #8FD93F

monochromatic

#1A1C84 #2427B7 #3F42D9 #7274E3 #A5A7ED

Accessibility & contrast

On white

7.02

#3F42D9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.99

#3F42D9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F42D9

7.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F42D9	#FFFFFF	#000000	##FFFFFF
##3F42D9	1.00	7.02	2.99	7.02
#FFFFFF	7.02	1.00	21.00	1.00
#000000	2.99	21.00	1.00	21.00
##FFFFFF	7.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060DE

Deuteranopia (green-blind)

#0052D6

Tritanopia (blue-blind)

#006C89

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #3f42d9;
/* rgb */ color: rgb(63, 66, 217);
/* oklch */ color: oklch(48.3% 0.223 273.4);

Tailwind

colors: {
  custom: {
    50: '#8977e6',
    500: '#3f42d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f42d9;
$custom-light: #8977e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3f42d9",
  "rgb": {
    "r": 63,
    "g": 66,
    "b": 217
  },
  "hsl": {
    "h": 238.831,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.4833,
    "c": 0.22344,
    "h": 273.4
  },
  "luminance": 0.09963
}

Semantic roles & 50–950 ramp

primary

#3F42D9

secondary

#DAD99A

accent

#E73EEA

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0D0916

muted

#7E7B84

Preview Lab

Preview with #3F42D9

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

Preview Lab → · Contrast checker → · Palette generator →