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Cool Gray Dusk
Color detail

Cool Gray Dusk

Neutral gray · Hue 210
Metrics
S 6% · L 34%
Contrast (WCAG)
on white7.3:1AAon black2.9:1Fail
Save to journalSign in to saveStart palette from thisRecent trail

About this color

Cool Gray Dusk (#51575C) belongs to the neutral grays — hue 210°, 6% saturation, 34% lightness. Copy the hex, RGB, or HSL value above, or paste the CSS custom property below into your stylesheet to reference this color directly.

CSS
:root {
  --colorarchive-cool-gray-dusk: #51575C;
  --colorarchive-cool-gray-dusk-hsl: hsl(210, 6%, 34%);
  --colorarchive-cool-gray-dusk-rgb: rgb(81, 87, 92);
}

AI Color Names

Let AI suggest alternative poetic names for this color in English and Chinese.

Color Origins

Neutral family

Not a color, but the canvas every color lives on.

Heritage

Bone black, lamp black, and ivory black are the classical pigment lineage of black, with Mars black a 20th-century addition; lead white (now heavily restricted), zinc white, and titanium white are the whites; and every gray sits between them. Charcoal and graphite extend the lineage. Painters historically mixed their warm and cool grays rather than taking them from a tube — Vermeer tinted grays of lead white, black, and umber with ultramarine. Scandinavian and Japanese design traditions have refined the use of pure neutrals to the point of philosophy.

Across cultures

In Western culture black is mourning (since the Roman Empire), formal (since late-medieval European courts), and rebellious (since 20th-century counterculture). In China and much of East Asia white is the traditional funeral color, though Japan has worn black since the Meiji era. Black-and-white photography defined visual journalism for a century. Concrete gray, since Brutalism, has come to read as both serious-civic and dystopian, depending on context. Scandinavian interiors often lean on the calibration of warm vs cool grays.

In the wild

Apple's restraint is essentially a religion of neutrals — white packaging and, since it dropped the rainbow logo in 1999, a single-color Apple mark. Chanel built a fashion empire on black-and-white. Muji's identity is the absence of identity — the name means 'no-brand quality goods', and its color range is deliberately limited. Vercel, Linear, GitHub, and many modern developer tools dial the saturation way down to make their content shine. The film noir aesthetic and modern minimalist branding both converge on neutrals.

How it reads

Pure neutrals (true gray) are eye-rest colors — they carry no hue of their own. Warm neutrals (taupe, warm gray) read as inviting, hospitality-friendly, soft. Cool neutrals (cool gray, slate) read as technical, premium, slightly distant. Off-whites and creams are heritage-luxury colors; near-blacks (charcoal, ink) read as serious without the harshness of pure black. Designers often choose a slightly warm or slightly cool neutral over true gray because it feels more deliberate and human.

This particular tone

A dim, atmospheric reading — closer to a colored shadow than a stated hue. Excellent as a near-black on dark UI or as a moody background.

Lightness band: At this depth the hue starts behaving like a neutral — it can substitute for black in many contexts while still carrying a faint chromatic temperature. It pairs especially well with off-whites and warm metallics.

Saturation band: The low saturation pulls this color toward earthen, vintage, or editorial palettes. It reads as confident and grown-up rather than playful, and it tolerates being used in large blocks without becoming visually noisy.

Brands using a similar color

Within the public brand-guidelines reference catalog, these are the closest matches to #51575C.

  • Airbnbneutral
    Hof Gray · #484848
    →
  • Microsoftneutral
    Slate Gray · #737373
    →
  • Notionneutral
    Notion Gray · #787774
    →

Cultures using a similar color

From the cultural-palette catalog, these regions feature a color close to #51575C.

  • ScandinaviaForest Green
    #3D5B49 · Spruce / fir forest in winter light
    →
  • Italy (Tuscany)Cypress Green
    #3F5E47 · Tuscan hilltop cypresses
    →
  • France (Paris)Zinc Roof Grey
    #5E6566 · Oxidized zinc roof tiles, central Paris
    →

Color guides

Go deeper on using color in design.

TypographyChoosing the Right Gray for Typography: Warm Gray vs. Cool Gray and Why It MattersUI/UX DesignNeutral Color Palettes: Warm vs Cool and How to ChooseInterface SystemsBuilding Neutral Color Palettes for Design Systems

Tonal strip

All lightness levels at this hue and saturation. Click any to navigate.

Palette moves

Instead of stopping at one swatch, use nearby, opposite, and tonal neighbors to branch into a broader palette.

Lighter companion
Cool Gray Velvet
#656B72 · hsl(210, 6%, 42%)
Darker companion
Cool Gray Shadow
#43474C · hsl(210, 6%, 28%)
Complementary counterpoint
Warm Gray Dusk
#5C5751 · hsl(30, 6%, 34%)
Analogous lead
Indigo Dusk Faint
#4E515F · hsl(230, 10%, 34%)
Analogous echo
Cerulean Dusk Faint
#4E5C5F · hsl(190, 10%, 34%)
Triadic +120°
Blush Dusk Faint
#5F4E57 · hsl(330, 10%, 34%)
Triadic +240°
Lime Dusk Faint
#575F4E · hsl(90, 10%, 34%)
Split-comp +150°
Crimson Dusk Faint
#5F4E4E · hsl(0, 10%, 34%)
Split-comp +210°
Citrine Dusk Faint
#5F5F4E · hsl(60, 10%, 34%)
Export preview
Base: Cool Gray Dusk #51575C
Lighter companion: Cool Gray Velvet #656B72
Darker companion: Cool Gray Shadow #43474C
Complementary counterpoint: Warm Gray Dusk #5C5751
Analogous lead: Indigo Dusk Faint #4E515F
Analogous echo: Cerulean Dusk Faint #4E5C5F
Triadic +120°: Blush Dusk Faint #5F4E57
Triadic +240°: Lime Dusk Faint #575F4E
Split-comp +150°: Crimson Dusk Faint #5F4E4E
Split-comp +210°: Citrine Dusk Faint #5F5F4E

Compare

See how Cool Gray Dusk compares side by side with related colors.

vsCool Gray VelvetvsCool Gray ShadowvsWarm Gray DuskvsIndigo Dusk FaintvsCerulean Dusk FaintvsBlush Dusk Faint

Nearest neighbors

The closest archive matches by hue, saturation, and lightness.

Search by hex
Nearby match
Sapphire Dusk Faint
#4E575F · hsl(210, 10%, 34%)
Nearby match
Cool Gray Shadow
#43474C · hsl(210, 6%, 28%)
Nearby match
Sapphire Dusk Muted
#475766 · hsl(210, 18%, 34%)
Nearby match
Cool Gray Velvet
#656B72 · hsl(210, 6%, 42%)
Nearby match
Sapphire Shadow Faint
#40474F · hsl(210, 10%, 28%)
Nearby match
Steel Dusk Faint
#4E585F · hsl(205, 10%, 34%)

Accessible pairings

Archive colors that meet WCAG contrast standards when paired with this color. Use as text-on-background or background-on-text.

Contrast checker
AAA7:1
Coral Veil Faint
#FAFAF9
AAA7:1
Coral Veil Muted
#FBFAF9
AAA7:1
Coral Veil Dust
#FBFAF9
AAA7:1
Coral Veil Soft
#FCFAF8
AAA7:1
Coral Veil Clear
#FDFAF7
AAA7.1:1
Coral Veil Vivid
#FEFAF6

Color Vision Simulation

How this color appears with different color vision deficiencies.

Full simulator
Deuteranopia
#53535B
Protanopia
#54545B
Tritanopia
#515A5A
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Saturation ladder

Same hue and lightness, from gray to pure

Search
Cool Gray Dusk#51575C · hsl(210, 6%, 34%)Sapphire Dusk Faint#4E575F · hsl(210, 10%, 34%)Sapphire Dusk Muted#475766 · hsl(210, 18%, 34%)Sapphire Dusk Dust#40576D · hsl(210, 26%, 34%)Sapphire Dusk Soft#395774 · hsl(210, 34%, 34%)Sapphire Dusk Clear#285786 · hsl(210, 54%, 34%)Sapphire Dusk Vivid#175797 · hsl(210, 74%, 34%)Sapphire Dusk Bright#0E57A0 · hsl(210, 84%, 34%)Sapphire Dusk Pure#0757A6 · hsl(210, 92%, 34%)
Appears in collections
Parisian Salon