#1F5BB4#1F5BB4

#1F5BB4 is a mid, vivid blue. Relative luminance 0.111; OKLCH L 48.5% C 0.154 H 258.7°. Best body text is #FFFFFF at 6.53:1 contrast (WCAG AA passes).

Color values

HEX	#1F5BB4
RGB	rgb(31, 91, 180)
HSL	hsl(216, 71%, 41%)
HSV	hsv(216, 83%, 71%)
CMYK	cmyk(82.8%, 49.4%, 0%, 29.4%)
CIE-LAB	lab(39.69, 14.49, -52.56)
CIE-LCH	lch(39.69, 54.52, 285.41°)
OKLab	oklab(48.47% -0.0301 -0.1513)
OKLCH	oklch(48.47% 0.154 258.7)
XYZ	xyz(12.5414, 11.0672, 44.6464)
Luminance	0.1107 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F5BB4 #B4781F

analogous

#1FA6B4 #1F5BB4 #2E1FB4

triadic

#1F5BB4 #B41F5B #5BB41F

tetradic

#1F5BB4 #B41FA6 #B4781F #1FB42E

square

#1F5BB4 #B41FA6 #B4781F #1FB42E

split-complementary

#1F5BB4 #B42E1F #A6B41F

monochromatic

#0D264C #164180 #1F5BB4 #3478DC #689BE5

Accessibility & contrast

On white

6.53

#1F5BB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.21

#1F5BB4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F5BB4

6.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F5BB4	#FFFFFF	#000000	##FFFFFF
##1F5BB4	1.00	6.53	3.21	6.53
#FFFFFF	6.53	1.00	21.00	1.00
#000000	3.21	21.00	1.00	21.00
##FFFFFF	6.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2565B7

Deuteranopia (green-blind)

#0057B2

Tritanopia (blue-blind)

#00717F

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #1f5bb4;
/* rgb */ color: rgb(31, 91, 180);
/* oklch */ color: oklch(48.5% 0.154 258.7);

Tailwind

colors: {
  custom: {
    50: '#7488cb',
    500: '#1f5bb4',
    950: '#000000',
  },
}

SCSS

$custom: #1f5bb4;
$custom-light: #7488cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f5bb4",
  "rgb": {
    "r": 31,
    "g": 91,
    "b": 180
  },
  "hsl": {
    "h": 215.839,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.48466,
    "c": 0.15423,
    "h": 258.7
  },
  "luminance": 0.11069
}

Semantic roles & 50–950 ramp

primary

#1F5BB4

secondary

#CBA164

accent

#A53AED

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F5BB4

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

Preview Lab → · Contrast checker → · Palette generator →