#1F51A5#1F51A5

#1F51A5 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.1% C 0.146 H 260.2°. Best body text is #FFFFFF at 7.56:1 contrast (WCAG AA passes).

Color values

HEX	#1F51A5
RGB	rgb(31, 81, 165)
HSL	hsl(218, 68%, 38%)
HSV	hsv(218, 81%, 65%)
CMYK	cmyk(81.2%, 50.9%, 0%, 35.3%)
CIE-LAB	lab(35.77, 15.19, -50.00)
CIE-LCH	lch(35.77, 52.26, 286.90°)
OKLab	oklab(45.13% -0.0248 -0.1439)
OKLCH	oklch(45.13% 0.146 260.2)
XYZ	xyz(10.2966, 8.8915, 36.7636)
Luminance	0.0889 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F51A5 #A5731F

analogous

#1F94A5 #1F51A5 #301FA5

triadic

#1F51A5 #A51F51 #51A51F

tetradic

#1F51A5 #A51F94 #A5731F #1FA530

square

#1F51A5 #A51F94 #A5731F #1FA530

split-complementary

#1F51A5 #A5301F #94A51F

monochromatic

#0C1E3E #153871 #1F51A5 #2A6BD7 #5E8FE1

Accessibility & contrast

On white

7.56

#1F51A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#1F51A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F51A5

7.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F51A5	#FFFFFF	#000000	##FFFFFF
##1F51A5	1.00	7.56	2.78	7.56
#FFFFFF	7.56	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C5BA8

Deuteranopia (green-blind)

#004EA3

Tritanopia (blue-blind)

#006573

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #1f51a5;
/* rgb */ color: rgb(31, 81, 165);
/* oklch */ color: oklch(45.1% 0.146 260.2);

Tailwind

colors: {
  custom: {
    50: '#7181c0',
    500: '#1f51a5',
    950: '#000000',
  },
}

SCSS

$custom: #1f51a5;
$custom-light: #7181c0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f51a5",
  "rgb": {
    "r": 31,
    "g": 81,
    "b": 165
  },
  "hsl": {
    "h": 217.612,
    "s": 68.367,
    "l": 38.431
  },
  "oklch": {
    "l": 0.4513,
    "c": 0.14605,
    "h": 260.2
  },
  "luminance": 0.08893
}

Semantic roles & 50–950 ramp

primary

#1F51A5

secondary

#C59D5B

accent

#AA3DEB

background

#F7F7FB

surface

#EDEEF7

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F51A5

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

Preview Lab → · Contrast checker → · Palette generator →