#3F589B#3F589B

#3F589B is a mid, moderate blue. Relative luminance 0.104; OKLCH L 47.4% C 0.113 H 266.7°. Best body text is #FFFFFF at 6.82:1 contrast (WCAG AA passes).

Color values

HEX	#3F589B
RGB	rgb(63, 88, 155)
HSL	hsl(224, 42%, 43%)
HSV	hsv(224, 59%, 61%)
CMYK	cmyk(59.4%, 43.2%, 0%, 39.2%)
CIE-LAB	lab(38.55, 11.82, -39.48)
CIE-LCH	lch(38.55, 41.21, 286.67°)
OKLab	oklab(47.44% -0.0064 -0.1123)
OKLCH	oklch(47.44% 0.113 266.7)
XYZ	xyz(11.4540, 10.4018, 32.4082)
Luminance	0.1040 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F589B #9B823F

analogous

#3F869B #3F589B #543F9B

triadic

#3F589B #9B3F58 #589B3F

tetradic

#3F589B #9B3F86 #9B823F #3F9B54

square

#3F589B #9B3F86 #9B823F #3F9B54

split-complementary

#3F589B #9B543F #869B3F

monochromatic

#1C2744 #2D3F6F #3F589B #5B75BC #869ACE

Accessibility & contrast

On white

6.82

#3F589B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#3F589B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F589B

6.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F589B	#FFFFFF	#000000	##FFFFFF
##3F589B	1.00	6.82	3.08	6.82
#FFFFFF	6.82	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B5F9E

Deuteranopia (green-blind)

#2E579A

Tritanopia (blue-blind)

#006772

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3f589b;
/* rgb */ color: rgb(63, 88, 155);
/* oklch */ color: oklch(47.4% 0.113 266.7);

Tailwind

colors: {
  custom: {
    50: '#7c86b9',
    500: '#3f589b',
    950: '#000000',
  },
}

SCSS

$custom: #3f589b;
$custom-light: #7c86b9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f589b",
  "rgb": {
    "r": 63,
    "g": 88,
    "b": 155
  },
  "hsl": {
    "h": 223.696,
    "s": 42.202,
    "l": 42.745
  },
  "oklch": {
    "l": 0.47441,
    "c": 0.1125,
    "h": 266.7
  },
  "luminance": 0.10403
}

Semantic roles & 50–950 ramp

primary

#3F589B

secondary

#B8A87D

accent

#B056D2

background

#F7F8FB

surface

#EEEFF6

border

#C9CAD0

text

#0A0B11

muted

#7C7C80

Preview Lab

Preview with #3F589B

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

Preview Lab → · Contrast checker → · Palette generator →