#1F57BB#1F57BB

#1F57BB is a mid, vivid blue. Relative luminance 0.107; OKLCH L 48.1% C 0.169 H 261.0°. Best body text is #FFFFFF at 6.69:1 contrast (WCAG AA passes).

Color values

HEX	#1F57BB
RGB	rgb(31, 87, 187)
HSL	hsl(218, 72%, 43%)
HSV	hsv(218, 83%, 73%)
CMYK	cmyk(83.4%, 53.5%, 0%, 26.7%)
CIE-LAB	lab(39.06, 19.89, -57.69)
CIE-LCH	lch(39.06, 61.02, 289.02°)
OKLab	oklab(48.14% -0.0264 -0.1664)
OKLCH	oklch(48.14% 0.169 261)
XYZ	xyz(12.9397, 10.6940, 48.3862)
Luminance	0.1070 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F57BB #BB831F

analogous

#1FA5BB #1F57BB #351FBB

triadic

#1F57BB #BB1F57 #57BB1F

tetradic

#1F57BB #BB1FA5 #BB831F #1FBB35

square

#1F57BB #BB1FA5 #BB831F #1FBB35

split-complementary

#1F57BB #BB351F #A5BB1F

monochromatic

#0E2652 #163F87 #1F57BB #3974DE #6E99E7

Accessibility & contrast

On white

6.69

#1F57BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.14

#1F57BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F57BB

6.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F57BB	#FFFFFF	#000000	##FFFFFF
##1F57BB	1.00	6.69	3.14	6.69
#FFFFFF	6.69	1.00	21.00	1.00
#000000	3.14	21.00	1.00	21.00
##FFFFFF	6.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0263BF

Deuteranopia (green-blind)

#0055B9

Tritanopia (blue-blind)

#007080

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1f57bb;
/* rgb */ color: rgb(31, 87, 187);
/* oklch */ color: oklch(48.1% 0.169 261.0);

Tailwind

colors: {
  custom: {
    50: '#7685d0',
    500: '#1f57bb',
    950: '#000000',
  },
}

SCSS

$custom: #1f57bb;
$custom-light: #7685d0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f57bb",
  "rgb": {
    "r": 31,
    "g": 87,
    "b": 187
  },
  "hsl": {
    "h": 218.462,
    "s": 71.56,
    "l": 42.745
  },
  "oklch": {
    "l": 0.4814,
    "c": 0.16852,
    "h": 261
  },
  "luminance": 0.10696
}

Semantic roles & 50–950 ramp

primary

#1F57BB

secondary

#CDA969

accent

#AD3AEE

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B14

muted

#7C7C82

Preview Lab

Preview with #1F57BB

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

Preview Lab → · Contrast checker → · Palette generator →