Conversions, palettes, contrast & design ideas for this color.
Color profile
#ADAEB5 is a neutral color from the Gray family, closest in name to “Nebulous December”. In RGB it is rgb(173, 174, 181); in HSL, hsl(233, 5%, 69%).
The color Nebulous December, with hexadecimal code #adaeb5, sits in the gray spectrum, evoking neutrality, balance, and professional composure. Grays anchor palettes without competing for attention. Additionally, it evokes emotions such as Softness, Delicacy, Calmness, Relaxation and Friendliness. With negligible saturation (5%), this color is effectively achromatic—a pure neutral that pairs with any hue without competition. At 69% lightness, it strikes an approachable, open balance—bright enough to feel welcoming yet substantial enough to carry visual weight. This color is ideal for designs that aim to express Softness, Delicacy, Calmness, Relaxation, or Friendliness. It can be effectively used in web design, branding, and marketing materials to attract attention and convey specific messages.
Key facts
The story of this color
Nebulous December (#ADAEB5) belongs to the Gray color family.
As an achromatic shade, this color carries a timeless, versatile neutrality that anchors any palette it joins.
Gray has long bridged the extremes of black and white in art and symbolism. Medieval monks wore gray habits to signal humility and penance. In Impressionist painting, artists discovered that mixing complementary colors yielded luminous grays far richer than simple black-white blends, unlocking new expressive possibilities that influenced everything from Monet's haystacks to Whistler's nocturnes.
Mid-tone grays are the workhorse of web and print layout, providing structure without stealing attention from primary content. Use gray for secondary text, borders, and icon states. A carefully chosen gray can unify diverse color accents across a multi-brand ecosystem.
Gray projects neutrality, professionalism, and composure. It anchors more vibrant colors and prevents visual chaos. Overuse, however, can feel flat or indecisive, so balancing gray with at least one saturated accent keeps designs engaging.
At 69% lightness, it reads clearly on dark backgrounds and provides a welcoming, open feel in light-themed designs—versatile across both contexts.
Build a grayscale type hierarchy—dark gray headings, medium-gray body text, light-gray captions—to establish clear information architecture. Combine warm grays (slightly yellow undertones) with wood-texture photography for an organic, approachable brand feel.
Every format
Every way to write Nebulous December — one-tap copy on every format; tap on any card to learn what it is and when to use it.
#ADAEB5
Hexadecimal is the web’s universal color notation — two digits each for red, green and blue. Drop it straight into HTML, CSS or any design tool.
rgb(173, 174, 181)
RGB is the additive Red-Green-Blue model every screen uses to emit light. The default choice for websites, apps and on-screen UI.
hsl(233, 5%, 69%)
HSL breaks a color into Hue, Saturation and Lightness — the most intuitive way to lighten, darken or mute a color in CSS.
hsv(233, 4%, 71%)
HSV (also called HSB) maps Hue, Saturation and Value/Brightness. It is the model behind the color pickers in Photoshop, Figma and most design apps.
hwb(233 68% 29%)
HWB blends a pure hue with Whiteness and Blackness — a painter-friendly model added in CSS Color 4 for quick tints and shades.
cmyk(4%, 4%, 0%, 29%)
CMYK is the subtractive Cyan-Magenta-Yellow-Black ink model. Use these values when preparing artwork for a printer or commercial press.
oklch(75.22% 0.010 279.63)
OKLCH is a modern, perceptually-uniform space (Lightness, Chroma, Hue). It powers smooth gradients and accessible palettes in today’s CSS.
oklab(75.22% 0.002 -0.010)
OKLab is the Cartesian form of OKLCH — ideal for blending and interpolating colors without the muddy midpoints older spaces produce.
L: 71.21, a: 1.00, b: -3.70
CIELAB is a device-independent, perceptually-uniform space. It is the standard for measuring color difference (ΔE) and matching across devices.
L: 71.21, C: 3.84, H: 285.06
LCH is CIELAB in cylindrical form — Lightness, Chroma and Hue — letting you adjust vividness and hue while staying perceptually even.
X: 40.71, Y: 42.49, Z: 49.77
CIE XYZ is the 1931 master space that underpins every other model here — the scientific bridge used to convert between color systems.
11382453
The 24-bit integer value of the color — handy for databases, APIs, game engines and low-level graphics code.
Channel breakdown
How much red, green and blue light mixes into Nebulous December.
Percentages show each channel's share of the total light (R + G + B) in Nebulous December.
Ink coverage
Ink needed to reproduce Nebulous December in four-color print. Heaviest ink: Key (Black).
Print tip: treat these values as a starting point — final output depends on printer profile, paper stock and calibration.
Accessibility · WCAG
How bright Nebulous December is, and how far black and white text clear each WCAG bar.
Contrast ratio · 1:1 → 21:1 (log scale)
Developer shortcuts
Copy-and-paste CSS for Nebulous December — per-line copy, or grab the whole block.
background-color: #ADAEB5;
color: #ADAEB5;
border: 2px solid #ADAEB5;
background-color: rgb(173, 174, 181);
background-color: hsl(233, 5%, 69%);
--color: #ADAEB5;
Shades · light to dark
Lighter and darker steps of Nebulous December — the color's full brightness range in one strip.
The dot marks the original color. Hover any shade to copy its hex or open its color page.
Harmony · 180° apart
Two colors opposite on the wheel — maximum contrast for attention-grabbing accents.
The dot marks the original color. Hover any shade to copy its hex or open its color page.
Harmony · adjacent hues
Neighboring hues on the wheel — harmonious, calm combinations that feel unified.
The dot marks the original color. Hover any shade to copy its hex or open its color page.
Harmony · 120° apart
Three colors evenly spaced on the wheel — vibrant and energetic, yet balanced.
The dot marks the original color. Hover any shade to copy its hex or open its color page.
Harmony · 90° apart
Four colors evenly spaced on the wheel (tetradic) — rich schemes with multiple accents.
The dot marks the original color. Hover any shade to copy its hex or open its color page.
Accessibility
How Nebulous December reads across five kinds of color vision — a ✓ Friendly verdict means the color difference stays distinguishable for that vision type.
The dot marks the original color. Hover any shade to copy its hex.
Harmony overview
The lead color from each harmony scheme, side by side — a shortcut to the full palettes above.
Perceptually nearby
A step away in brightness, richness or shade — each still feels like the same color.
From the color-name library
The closest named colors to #ADAEB5 — same mood, each with its own character.
Looking for more Gray shades? Browse Gray colors →
Inspiration
Curated Unsplash photos that carry the mood of Nebulous December — hover any tile to download it or view the original.
Good to know
Harmony