#3F70BB#3F70BB

#3F70BB is a mid, vivid blue. Relative luminance 0.162; OKLCH L 54.8% C 0.129 H 258.7°. Best body text is #FFFFFF at 4.95:1 contrast (WCAG AA passes).

Color values

HEX	#3F70BB
RGB	rgb(63, 112, 187)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 66%, 73%)
CMYK	cmyk(66.3%, 40.1%, 0%, 26.7%)
CIE-LAB	lab(47.28, 7.92, -44.43)
CIE-LCH	lch(47.28, 45.13, 280.11°)
OKLab	oklab(54.77% -0.0253 -0.1265)
OKLCH	oklch(54.77% 0.129 258.7)
XYZ	xyz(16.8105, 16.2313, 49.2511)
Luminance	0.1623 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70BB #BB8A3F

analogous

#3FAEBB #3F70BB #4C3FBB

triadic

#3F70BB #BB3F70 #70BB3F

tetradic

#3F70BB #BB3FAE #BB8A3F #3FBB4C

square

#3F70BB #BB3FAE #BB8A3F #3FBB4C

split-complementary

#3F70BB #BB4C3F #AEBB3F

monochromatic

#20395F #30558D #3F70BB #6A91CD #98B3DC

Accessibility & contrast

On white

4.95

#3F70BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.25

#3F70BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70BB

4.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70BB	#FFFFFF	#000000	##FFFFFF
##3F70BB	1.00	4.95	4.25	4.95
#FFFFFF	4.95	1.00	21.00	1.00
#000000	4.25	21.00	1.00	21.00
##FFFFFF	4.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E76BE

Deuteranopia (green-blind)

#3B6BB9

Tritanopia (blue-blind)

#00818C

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3f70bb;
/* rgb */ color: rgb(63, 112, 187);
/* oklch */ color: oklch(54.8% 0.129 258.7);

Tailwind

colors: {
  custom: {
    50: '#8198d0',
    500: '#3f70bb',
    950: '#000000',
  },
}

SCSS

$custom: #3f70bb;
$custom-light: #8198d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70bb",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 187
  },
  "hsl": {
    "h": 216.29,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.54773,
    "c": 0.12904,
    "h": 258.7
  },
  "luminance": 0.16233
}

Semantic roles & 50–950 ramp

primary

#3F70BB

secondary

#C8B18E

accent

#A24FD9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F70BB

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

Preview Lab → · Contrast checker → · Palette generator →