Accessibility
Vs white / black
7.16:1 · 2.93:1
Sources
Codes
HEX
#515a51
RGB
rgb(81, 90, 81)
RGBA
rgba(81, 90, 81, 1)
HSL
hsl(120, 5%, 34%)
HSV
hsv(120, 10%, 35%)
LAB
lab(37.22% -5.49 4)
LCH
lch(37.22% 6.79 143.92)
OKLAB
oklab(0.4568 -0.015 0.0104)
OKLCH
oklch(0.4568 0.0183 145.27)
XYZ
xyz(8.53, 9.66, 9.20)
CMYK
cmyk(10%, 0%, 10%, 65%)
CSS
color: #515a51;
CSS variable
--color-515a51: #515a51;
SCSS
$color-515a51: #515a51;
Tailwind
slate-600
Export
:root {
--#515a51-1: #515a51;
}Palette
Full scale from light tints through the base color into deep shades
Palette
Mixed toward white — soft backgrounds and highlights
Palette
Mixed toward black — depth, text, and emphasis
Palette
Mixed toward neutral grey — muted UI surfaces
Harmony
Opposite on the color wheel for contrast
Harmony
Neighbors that sit comfortably together
Harmony
Evenly spaced triad for vibrant sets
Harmony
Base plus two accents beside the complement
Harmony
Same hue, varied lightness and saturation
Using this color
#515A51 (#515a51) sits in the grey family at about 120° hue, 5% saturation, and 34% lightness. Contrast is 7.16:1 on white and 2.93:1 on black, so white labels read more clearly on the swatch itself. Closest Tailwind token in our matcher: slate-600.
Sensible jobs for this swatch
On a black or near-black UI, #515a51 is 2.93:1. Prefer it as a fill, border, or large heading rather than 16px copy.
Low saturation makes this easy to overuse as a neutral. Keep one chromatic accent elsewhere so the interface does not go muddy.
Family context: Neutrality, balance, and modernity. Essential for UI chrome, typography, and systems. Common uses still include buttons, charts, and accents in the Grey range — always verify the pair for this exact hex in the contrast checker.
Related
Nearby colors from the library by perceptual distance