#1F51AD#1F51AD

#1F51AD is a mid, vivid blue. Relative luminance 0.092; OKLCH L 45.8% C 0.157 H 261.3°. Best body text is #FFFFFF at 7.40:1 contrast (WCAG AA passes).

Color values

HEX	#1F51AD
RGB	rgb(31, 81, 173)
HSL	hsl(219, 70%, 40%)
HSV	hsv(219, 82%, 68%)
CMYK	cmyk(82.1%, 53.2%, 0%, 32.2%)
CIE-LAB	lab(36.35, 18.36, -53.83)
CIE-LCH	lch(36.35, 56.88, 288.83°)
OKLab	oklab(45.75% -0.0238 -0.1552)
OKLCH	oklch(45.75% 0.157 261.3)
XYZ	xyz(11.0476, 9.1920, 40.7190)
Luminance	0.0919 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F51AD #AD7B1F

analogous

#1F98AD #1F51AD #341FAD

triadic

#1F51AD #AD1F51 #51AD1F

tetradic

#1F51AD #AD1F98 #AD7B1F #1FAD34

square

#1F51AD #AD1F98 #AD7B1F #1FAD34

split-complementary

#1F51AD #AD341F #98AD1F

monochromatic

#0C2045 #163979 #1F51AD #2F6BDA #6390E3

Accessibility & contrast

On white

7.40

#1F51AD on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.84

#1F51AD on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F51AD

7.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F51AD	#FFFFFF	#000000	##FFFFFF
##1F51AD	1.00	7.40	2.84	7.40
#FFFFFF	7.40	1.00	21.00	1.00
#000000	2.84	21.00	1.00	21.00
##FFFFFF	7.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A5CB0

Deuteranopia (green-blind)

#004FAB

Tritanopia (blue-blind)

#006877

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1f51ad;
/* rgb */ color: rgb(31, 81, 173);
/* oklch */ color: oklch(45.8% 0.157 261.3);

Tailwind

colors: {
  custom: {
    50: '#7381c6',
    500: '#1f51ad',
    950: '#000000',
  },
}

SCSS

$custom: #1f51ad;
$custom-light: #7381c6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f51ad",
  "rgb": {
    "r": 31,
    "g": 81,
    "b": 173
  },
  "hsl": {
    "h": 218.873,
    "s": 69.608,
    "l": 40
  },
  "oklch": {
    "l": 0.45754,
    "c": 0.15702,
    "h": 261.3
  },
  "luminance": 0.09193
}

Semantic roles & 50–950 ramp

primary

#1F51AD

secondary

#C8A360

accent

#AE3BEC

background

#F7F7FC

surface

#EEEEF8

border

#C9C9D1

text

#090A13

muted

#7B7C82

Preview Lab

Preview with #1F51AD

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

Preview Lab → · Contrast checker → · Palette generator →