#1F51A8#1F51A8

#1F51A8 is a mid, vivid blue. Relative luminance 0.090; OKLCH L 45.4% C 0.150 H 260.7°. Best body text is #FFFFFF at 7.50:1 contrast (WCAG AA passes).

Color values

HEX	#1F51A8
RGB	rgb(31, 81, 168)
HSL	hsl(218, 69%, 39%)
HSV	hsv(218, 82%, 66%)
CMYK	cmyk(81.5%, 51.8%, 0%, 34.1%)
CIE-LAB	lab(35.99, 16.38, -51.45)
CIE-LCH	lch(35.99, 53.99, 287.66°)
OKLab	oklab(45.36% -0.0244 -0.1482)
OKLCH	oklch(45.36% 0.15 260.7)
XYZ	xyz(10.5728, 9.0020, 38.2185)
Luminance	0.0900 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F51A8 #A8761F

analogous

#1F96A8 #1F51A8 #321FA8

triadic

#1F51A8 #A81F51 #51A81F

tetradic

#1F51A8 #A81F96 #A8761F #1FA832

square

#1F51A8 #A81F96 #A8761F #1FA832

split-complementary

#1F51A8 #A8321F #96A81F

monochromatic

#0C1F41 #153874 #1F51A8 #2C6BD8 #608FE2

Accessibility & contrast

On white

7.50

#1F51A8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#1F51A8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F51A8

7.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F51A8	#FFFFFF	#000000	##FFFFFF
##1F51A8	1.00	7.50	2.80	7.50
#FFFFFF	7.50	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#175BAB

Deuteranopia (green-blind)

#004FA6

Tritanopia (blue-blind)

#006674

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1f51a8;
/* rgb */ color: rgb(31, 81, 168);
/* oklch */ color: oklch(45.4% 0.150 260.7);

Tailwind

colors: {
  custom: {
    50: '#7281c2',
    500: '#1f51a8',
    950: '#000000',
  },
}

SCSS

$custom: #1f51a8;
$custom-light: #7281c2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f51a8",
  "rgb": {
    "r": 31,
    "g": 81,
    "b": 168
  },
  "hsl": {
    "h": 218.102,
    "s": 68.844,
    "l": 39.02
  },
  "oklch": {
    "l": 0.45362,
    "c": 0.15018,
    "h": 260.7
  },
  "luminance": 0.09003
}

Semantic roles & 50–950 ramp

primary

#1F51A8

secondary

#C6A05D

accent

#AC3CEC

background

#F7F7FC

surface

#EDEEF8

border

#C8C9D1

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F51A8

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

Preview Lab → · Contrast checker → · Palette generator →