#3F70DB#3F70DB

#3F70DB is a mid, vivid blue. Relative luminance 0.178; OKLCH L 56.9% C 0.172 H 263.4°. Best body text is #FFFFFF at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#3F70DB
RGB	rgb(63, 112, 219)
HSL	hsl(221, 68%, 55%)
HSV	hsv(221, 71%, 86%)
CMYK	cmyk(71.2%, 48.9%, 0%, 14.1%)
CIE-LAB	lab(49.20, 19.43, -59.66)
CIE-LCH	lch(49.20, 62.74, 288.04°)
OKLab	oklab(56.88% -0.0198 -0.1713)
OKLCH	oklch(56.88% 0.172 263.4)
XYZ	xyz(20.6257, 17.7574, 69.3446)
Luminance	0.1776 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70DB #DBAA3F

analogous

#3FBEDB #3F70DB #5C3FDB

triadic

#3F70DB #DB3F70 #70DB3F

tetradic

#3F70DB #DB3FBE #DBAA3F #3FDB5C

square

#3F70DB #DB3FBE #DBAA3F #3FDB5C

split-complementary

#3F70DB #DB5C3F #BEDB3F

monochromatic

#193B86 #2352BA #3F70DB #7396E5 #A6BDEE

Accessibility & contrast

On white

4.61

#3F70DB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.55

#3F70DB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70DB

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70DB	#FFFFFF	#000000	##FFFFFF
##3F70DB	1.00	4.61	4.55	4.61
#FFFFFF	4.61	1.00	21.00	1.00
#000000	4.55	21.00	1.00	21.00
##FFFFFF	4.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#337DDF

Deuteranopia (green-blind)

#006ED9

Tritanopia (blue-blind)

#00899B

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f70db;
/* rgb */ color: rgb(63, 112, 219);
/* oklch */ color: oklch(56.9% 0.172 263.4);

Tailwind

colors: {
  custom: {
    50: '#8798e7',
    500: '#3f70db',
    950: '#000000',
  },
}

SCSS

$custom: #3f70db;
$custom-light: #8798e7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70db",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 219
  },
  "hsl": {
    "h": 221.154,
    "s": 68.421,
    "l": 55.294
  },
  "oklch": {
    "l": 0.56875,
    "c": 0.17243,
    "h": 263.4
  },
  "luminance": 0.1776
}

Semantic roles & 50–950 ramp

primary

#3F70DB

secondary

#DCC79A

accent

#B43DEB

background

#F9F9FE

surface

#F1F2FC

border

#CBCCD5

text

#0D0D16

muted

#7E7E84

Preview Lab

Preview with #3F70DB

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

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