#3F70BC#3F70BC

#3F70BC is a mid, vivid blue. Relative luminance 0.163; OKLCH L 54.8% C 0.130 H 258.9°. Best body text is #FFFFFF at 4.94:1 contrast (WCAG AA passes).

Color values

HEX	#3F70BC
RGB	rgb(63, 112, 188)
HSL	hsl(216, 50%, 49%)
HSV	hsv(216, 66%, 74%)
CMYK	cmyk(66.5%, 40.4%, 0%, 26.3%)
CIE-LAB	lab(47.33, 8.27, -44.92)
CIE-LCH	lch(47.33, 45.67, 280.44°)
OKLab	oklab(54.84% -0.0251 -0.128)
OKLCH	oklch(54.84% 0.13 258.9)
XYZ	xyz(16.9179, 16.2743, 49.8169)
Luminance	0.1628 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70BC #BC8B3F

analogous

#3FAFBC #3F70BC #4D3FBC

triadic

#3F70BC #BC3F70 #70BC3F

tetradic

#3F70BC #BC3FAF #BC8B3F #3FBC4D

square

#3F70BC #BC3FAF #BC8B3F #3FBC4D

split-complementary

#3F70BC #BC4D3F #AFBC3F

monochromatic

#203960 #30558E #3F70BC #6B91CD #99B3DD

Accessibility & contrast

On white

4.94

#3F70BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.26

#3F70BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70BC

4.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70BC	#FFFFFF	#000000	##FFFFFF
##3F70BC	1.00	4.94	4.26	4.94
#FFFFFF	4.94	1.00	21.00	1.00
#000000	4.26	21.00	1.00	21.00
##FFFFFF	4.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D77BF

Deuteranopia (green-blind)

#3B6BBA

Tritanopia (blue-blind)

#00818D

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3f70bc;
/* rgb */ color: rgb(63, 112, 188);
/* oklch */ color: oklch(54.8% 0.130 258.9);

Tailwind

colors: {
  custom: {
    50: '#8198d0',
    500: '#3f70bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f70bc;
$custom-light: #8198d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70bc",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 188
  },
  "hsl": {
    "h": 216.48,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.54835,
    "c": 0.1304,
    "h": 258.9
  },
  "luminance": 0.16276
}

Semantic roles & 50–950 ramp

primary

#3F70BC

secondary

#C9B28E

accent

#A34ED9

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3F70BC

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

Preview Lab → · Contrast checker → · Palette generator →