#3F45A5#3F45A5

#3F45A5 is a dark, vivid blue. Relative luminance 0.080; OKLCH L 44.2% C 0.152 H 275.6°. Best body text is #FFFFFF at 8.06:1 contrast (WCAG AA passes).

Color values

HEX	#3F45A5
RGB	rgb(63, 69, 165)
HSL	hsl(236, 45%, 45%)
HSV	hsv(236, 62%, 65%)
CMYK	cmyk(61.8%, 58.2%, 0%, 35.3%)
CIE-LAB	lab(34.04, 27.72, -52.73)
CIE-LCH	lch(34.04, 59.57, 297.73°)
OKLab	oklab(44.24% 0.0147 -0.1515)
OKLCH	oklch(44.24% 0.152 275.6)
XYZ	xyz(10.9673, 8.0288, 36.5618)
Luminance	0.0803 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F45A5 #A59F3F

analogous

#3F78A5 #3F45A5 #6C3FA5

triadic

#3F45A5 #A53F45 #45A53F

tetradic

#3F45A5 #A53F78 #A59F3F #3FA56C

square

#3F45A5 #A53F78 #A59F3F #3FA56C

split-complementary

#3F45A5 #A56C3F #78A53F

monochromatic

#1D204C #2E3279 #3F45A5 #5F65C2 #8C90D3

Accessibility & contrast

On white

8.06

#3F45A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.61

#3F45A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F45A5

8.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45A5	#FFFFFF	#000000	##FFFFFF
##3F45A5	1.00	8.06	2.61	8.06
#FFFFFF	8.06	1.00	21.00	1.00
#000000	2.61	21.00	1.00	21.00
##FFFFFF	8.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055A8

Deuteranopia (green-blind)

#004CA3

Tritanopia (blue-blind)

#005C6E

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #3f45a5;
/* rgb */ color: rgb(63, 69, 165);
/* oklch */ color: oklch(44.2% 0.152 275.6);

Tailwind

colors: {
  custom: {
    50: '#7f78c0',
    500: '#3f45a5',
    950: '#000000',
  },
}

SCSS

$custom: #3f45a5;
$custom-light: #7f78c0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45a5",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 165
  },
  "hsl": {
    "h": 236.471,
    "s": 44.737,
    "l": 44.706
  },
  "oklch": {
    "l": 0.44242,
    "c": 0.15223,
    "h": 275.6
  },
  "luminance": 0.0803
}

Semantic roles & 50–950 ramp

primary

#3F45A5

secondary

#BEBA82

accent

#CD53D4

background

#F8F7FB

surface

#EFEDF7

border

#CAC8D0

text

#0B0912

muted

#7C7B81

Preview Lab

Preview with #3F45A5

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

Preview Lab → · Contrast checker → · Palette generator →