#1F51A9#1F51A9

#1F51A9 is a mid, vivid blue. Relative luminance 0.090; OKLCH L 45.4% C 0.152 H 260.8°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#1F51A9
RGB	rgb(31, 81, 169)
HSL	hsl(218, 69%, 39%)
HSV	hsv(218, 82%, 66%)
CMYK	cmyk(81.7%, 52.1%, 0%, 33.7%)
CIE-LAB	lab(36.06, 16.78, -51.93)
CIE-LCH	lch(36.06, 54.57, 287.90°)
OKLab	oklab(45.44% -0.0242 -0.1496)
OKLCH	oklch(45.44% 0.152 260.8)
XYZ	xyz(10.6663, 9.0395, 38.7110)
Luminance	0.0904 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F51A9 #A9771F

analogous

#1F96A9 #1F51A9 #321FA9

triadic

#1F51A9 #A91F51 #51A91F

tetradic

#1F51A9 #A91F96 #A9771F #1FA932

square

#1F51A9 #A91F96 #A9771F #1FA932

split-complementary

#1F51A9 #A9321F #96A91F

monochromatic

#0C1F42 #163875 #1F51A9 #2D6BD8 #608FE2

Accessibility & contrast

On white

7.48

#1F51A9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#1F51A9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F51A9

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F51A9	#FFFFFF	#000000	##FFFFFF
##1F51A9	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#155BAC

Deuteranopia (green-blind)

#004FA7

Tritanopia (blue-blind)

#006675

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1f51a9;
/* rgb */ color: rgb(31, 81, 169);
/* oklch */ color: oklch(45.4% 0.152 260.8);

Tailwind

colors: {
  custom: {
    50: '#7281c3',
    500: '#1f51a9',
    950: '#000000',
  },
}

SCSS

$custom: #1f51a9;
$custom-light: #7281c3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f51a9",
  "rgb": {
    "r": 31,
    "g": 81,
    "b": 169
  },
  "hsl": {
    "h": 218.261,
    "s": 69,
    "l": 39.216
  },
  "oklch": {
    "l": 0.45439,
    "c": 0.15155,
    "h": 260.8
  },
  "luminance": 0.09041
}

Semantic roles & 50–950 ramp

primary

#1F51A9

secondary

#C7A05D

accent

#AC3CEC

background

#F7F7FC

surface

#EEEEF8

border

#C9C9D1

text

#090A13

muted

#7B7C82

Preview Lab

Preview with #1F51A9

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

Preview Lab → · Contrast checker → · Palette generator →