#3665B1#3665B1

#3665B1 is a mid, vivid blue. Relative luminance 0.133; OKLCH L 51.3% C 0.131 H 259.6°. Best body text is #FFFFFF at 5.75:1 contrast (WCAG AA passes).

Color values

HEX	#3665B1
RGB	rgb(54, 101, 177)
HSL	hsl(217, 53%, 45%)
HSV	hsv(217, 69%, 69%)
CMYK	cmyk(69.5%, 42.9%, 0%, 30.6%)
CIE-LAB	lab(43.16, 9.74, -45.19)
CIE-LCH	lch(43.16, 46.23, 282.16°)
OKLab	oklab(51.29% -0.0237 -0.1291)
OKLCH	oklch(51.29% 0.131 259.6)
XYZ	xyz(14.1080, 13.2645, 43.4032)
Luminance	0.1327 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3665B1 #B18236

analogous

#36A3B1 #3665B1 #4436B1

triadic

#3665B1 #B13665 #65B136

tetradic

#3665B1 #B136A3 #B18236 #36B144

square

#3665B1 #B136A3 #B18236 #36B144

split-complementary

#3665B1 #B14436 #A3B136

monochromatic

#192F53 #284A82 #3665B1 #5884CC #87A7DA

Accessibility & contrast

On white

5.75

#3665B1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.65

#3665B1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3665B1

5.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3665B1	#FFFFFF	#000000	##FFFFFF
##3665B1	1.00	5.75	3.65	5.75
#FFFFFF	5.75	1.00	21.00	1.00
#000000	3.65	21.00	1.00	21.00
##FFFFFF	5.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#416CB4

Deuteranopia (green-blind)

#2C61AF

Tritanopia (blue-blind)

#007782

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3665b1;
/* rgb */ color: rgb(54, 101, 177);
/* oklch */ color: oklch(51.3% 0.131 259.6);

Tailwind

colors: {
  custom: {
    50: '#7b90c9',
    500: '#3665b1',
    950: '#000000',
  },
}

SCSS

$custom: #3665b1;
$custom-light: #7b90c9;
$custom-dark: #000000;

JSON

{
  "hex": "#3665b1",
  "rgb": {
    "r": 54,
    "g": 101,
    "b": 177
  },
  "hsl": {
    "h": 217.073,
    "s": 53.247,
    "l": 45.294
  },
  "oklch": {
    "l": 0.51294,
    "c": 0.13125,
    "h": 259.6
  },
  "luminance": 0.13266
}

Semantic roles & 50–950 ramp

primary

#3665B1

secondary

#C4AA7F

accent

#A54BDD

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3665B1

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

Preview Lab → · Contrast checker → · Palette generator →