#3F41A5#3F41A5

#3F41A5 is a dark, vivid blue. Relative luminance 0.076; OKLCH L 43.5% C 0.157 H 276.8°. Best body text is #FFFFFF at 8.36:1 contrast (WCAG AA passes).

Color values

HEX	#3F41A5
RGB	rgb(63, 65, 165)
HSL	hsl(239, 45%, 45%)
HSV	hsv(239, 62%, 65%)
CMYK	cmyk(61.8%, 60.6%, 0%, 35.3%)
CIE-LAB	lab(33.03, 30.29, -54.37)
CIE-LCH	lch(33.03, 62.24, 299.13°)
OKLab	oklab(43.5% 0.0186 -0.1564)
OKLCH	oklch(43.5% 0.157 276.8)
XYZ	xyz(10.7295, 7.5531, 36.4825)
Luminance	0.0755 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.04

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F41A5 #A5A33F

analogous

#3F74A5 #3F41A5 #703FA5

triadic

#3F41A5 #A53F41 #41A53F

tetradic

#3F41A5 #A53F74 #A5A33F #3FA570

square

#3F41A5 #A53F74 #A5A33F #3FA570

split-complementary

#3F41A5 #A5703F #74A53F

monochromatic

#1D1E4C #2E3079 #3F41A5 #5F61C2 #8C8DD3

Accessibility & contrast

On white

8.36

#3F41A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#3F41A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F41A5

8.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F41A5	#FFFFFF	#000000	##FFFFFF
##3F41A5	1.00	8.36	2.51	8.36
#FFFFFF	8.36	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052A8

Deuteranopia (green-blind)

#0049A3

Tritanopia (blue-blind)

#00596C

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #3f41a5;
/* rgb */ color: rgb(63, 65, 165);
/* oklch */ color: oklch(43.5% 0.157 276.8);

Tailwind

colors: {
  custom: {
    50: '#7f75c0',
    500: '#3f41a5',
    950: '#000000',
  },
}

SCSS

$custom: #3f41a5;
$custom-light: #7f75c0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f41a5",
  "rgb": {
    "r": 63,
    "g": 65,
    "b": 165
  },
  "hsl": {
    "h": 238.824,
    "s": 44.737,
    "l": 44.706
  },
  "oklch": {
    "l": 0.43495,
    "c": 0.15746,
    "h": 276.8
  },
  "luminance": 0.07554
}

Semantic roles & 50–950 ramp

primary

#3F41A5

secondary

#BEBD82

accent

#D253D4

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0B0812

muted

#7C7B81

Preview Lab

Preview with #3F41A5

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

Preview Lab → · Contrast checker → · Palette generator →