#1F57B0#1F57B0

#1F57B0 is a mid, vivid blue. Relative luminance 0.102; OKLCH L 47.3% C 0.154 H 259.6°. Best body text is #FFFFFF at 6.89:1 contrast (WCAG AA passes).

Color values

HEX	#1F57B0
RGB	rgb(31, 87, 176)
HSL	hsl(217, 70%, 41%)
HSV	hsv(217, 82%, 69%)
CMYK	cmyk(82.4%, 50.6%, 0%, 31%)
CIE-LAB	lab(38.27, 15.55, -52.50)
CIE-LCH	lch(38.27, 54.76, 286.50°)
OKLab	oklab(47.29% -0.0277 -0.1512)
OKLCH	oklch(47.29% 0.154 259.6)
XYZ	xyz(11.8069, 10.2408, 42.4203)
Luminance	0.1024 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F57B0 #B0781F

analogous

#1F9FB0 #1F57B0 #301FB0

triadic

#1F57B0 #B01F57 #57B01F

tetradic

#1F57B0 #B01F9F #B0781F #1FB030

square

#1F57B0 #B01F9F #B0781F #1FB030

split-complementary

#1F57B0 #B0301F #9FB01F

monochromatic

#0D2448 #163D7C #1F57B0 #3173DB #6596E4

Accessibility & contrast

On white

6.89

#1F57B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.05

#1F57B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F57B0

6.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F57B0	#FFFFFF	#000000	##FFFFFF
##1F57B0	1.00	6.89	3.05	6.89
#FFFFFF	6.89	1.00	21.00	1.00
#000000	3.05	21.00	1.00	21.00
##FFFFFF	6.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F61B3

Deuteranopia (green-blind)

#0054AE

Tritanopia (blue-blind)

#006D7B

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #1f57b0;
/* rgb */ color: rgb(31, 87, 176);
/* oklch */ color: oklch(47.3% 0.154 259.6);

Tailwind

colors: {
  custom: {
    50: '#7485c8',
    500: '#1f57b0',
    950: '#000000',
  },
}

SCSS

$custom: #1f57b0;
$custom-light: #7485c8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f57b0",
  "rgb": {
    "r": 31,
    "g": 87,
    "b": 176
  },
  "hsl": {
    "h": 216.828,
    "s": 70.048,
    "l": 40.588
  },
  "oklch": {
    "l": 0.47288,
    "c": 0.15369,
    "h": 259.6
  },
  "luminance": 0.10242
}

Semantic roles & 50–950 ramp

primary

#1F57B0

secondary

#C9A162

accent

#A83BED

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F57B0

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

Preview Lab → · Contrast checker → · Palette generator →