#1F3F9E#1F3F9E

#1F3F9E is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.7% C 0.159 H 265.5°. Best body text is #FFFFFF at 9.28:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F9E
RGB	rgb(31, 63, 158)
HSL	hsl(225, 67%, 37%)
HSV	hsv(225, 80%, 62%)
CMYK	cmyk(80.4%, 60.1%, 0%, 38%)
CIE-LAB	lab(30.19, 24.60, -54.85)
CIE-LCH	lch(30.19, 60.12, 294.16°)
OKLab	oklab(40.74% -0.0126 -0.1585)
OKLCH	oklch(40.74% 0.159 265.5)
XYZ	xyz(8.5120, 6.3139, 33.1112)
Luminance	0.0631 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F9E #9E7E1F

analogous

#1F7F9E #1F3F9E #3F1F9E

triadic

#1F3F9E #9E1F3F #3F9E1F

tetradic

#1F3F9E #9E1F7F #9E7E1F #1F9E3F

square

#1F3F9E #9E1F7F #9E7E1F #1F9E3F

split-complementary

#1F3F9E #9E3F1F #7F9E1F

monochromatic

#0B1638 #152B6B #1F3F9E #2953D1 #597BDE

Accessibility & contrast

On white

9.28

#1F3F9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#1F3F9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F9E

9.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F9E	#FFFFFF	#000000	##FFFFFF
##1F3F9E	1.00	9.28	2.26	9.28
#FFFFFF	9.28	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA1

Deuteranopia (green-blind)

#00419C

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f3f9e;
/* rgb */ color: rgb(31, 63, 158);
/* oklch */ color: oklch(40.7% 0.159 265.5);

Tailwind

colors: {
  custom: {
    50: '#7173bb',
    500: '#1f3f9e',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f9e;
$custom-light: #7173bb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f9e",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 158
  },
  "hsl": {
    "h": 224.882,
    "s": 67.196,
    "l": 37.059
  },
  "oklch": {
    "l": 0.40736,
    "c": 0.15904,
    "h": 265.5
  },
  "luminance": 0.06315
}

Semantic roles & 50–950 ramp

primary

#1F3F9E

secondary

#C2A756

accent

#BF3EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F3F9E

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

Preview Lab → · Contrast checker → · Palette generator →