#1F5BBB#1F5BBB

#1F5BBB is a mid, vivid blue. Relative luminance 0.114; OKLCH L 49.0% C 0.164 H 259.8°. Best body text is #FFFFFF at 6.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F5BBB
RGB	rgb(31, 91, 187)
HSL	hsl(217, 72%, 43%)
HSV	hsv(217, 83%, 73%)
CMYK	cmyk(83.4%, 51.3%, 0%, 26.7%)
CIE-LAB	lab(40.18, 17.25, -55.88)
CIE-LCH	lch(40.18, 58.48, 287.15°)
OKLab	oklab(48.99% -0.0291 -0.161)
OKLCH	oklch(48.99% 0.164 259.8)
XYZ	xyz(13.2725, 11.3597, 48.4972)
Luminance	0.1136 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F5BBB #BB7F1F

analogous

#1FA9BB #1F5BBB #311FBB

triadic

#1F5BBB #BB1F5B #5BBB1F

tetradic

#1F5BBB #BB1FA9 #BB7F1F #1FBB31

square

#1F5BBB #BB1FA9 #BB7F1F #1FBB31

split-complementary

#1F5BBB #BB311F #A9BB1F

monochromatic

#0E2852 #164187 #1F5BBB #3979DE #6E9CE7

Accessibility & contrast

On white

6.42

#1F5BBB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.27

#1F5BBB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F5BBB

6.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F5BBB	#FFFFFF	#000000	##FFFFFF
##1F5BBB	1.00	6.42	3.27	6.42
#FFFFFF	6.42	1.00	21.00	1.00
#000000	3.27	21.00	1.00	21.00
##FFFFFF	6.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A66BE

Deuteranopia (green-blind)

#0058B9

Tritanopia (blue-blind)

#007282

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #1f5bbb;
/* rgb */ color: rgb(31, 91, 187);
/* oklch */ color: oklch(49.0% 0.164 259.8);

Tailwind

colors: {
  custom: {
    50: '#7688d0',
    500: '#1f5bbb',
    950: '#000000',
  },
}

SCSS

$custom: #1f5bbb;
$custom-light: #7688d0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f5bbb",
  "rgb": {
    "r": 31,
    "g": 91,
    "b": 187
  },
  "hsl": {
    "h": 216.923,
    "s": 71.56,
    "l": 42.745
  },
  "oklch": {
    "l": 0.48994,
    "c": 0.16363,
    "h": 259.8
  },
  "luminance": 0.11361
}

Semantic roles & 50–950 ramp

primary

#1F5BBB

secondary

#CDA669

accent

#A93AEE

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B14

muted

#7C7C82

Preview Lab

Preview with #1F5BBB

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

Preview Lab → · Contrast checker → · Palette generator →