Alpine
Open in tool →Glacier blue with a safety-orange accent: technical outdoor gear, not lifestyle.
Color
#181d2f
#181d2f
hex
#181d2frgb
rgb(24, 29, 47)hsl
hsl(227, 32%, 14%)oklch
oklch(0.235 0.036 271.6)Closest name: Dark Knight (#151931)Relative luminance 0.0128
Colors that go with #181d2f
Charcoal, Dark Olive Green and Sea Green lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #181d2f: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #181d2f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #181d2f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
split-complementshippedSienna is a split-complement of #181d2f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Slate Blue #6a5acd
analogousshippedSlate Blue is #181d2f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Steel Blue #4682b4
analogousshippedSteel Blue is #181d2f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #181d2f in 18 real palettes, including Blueprint and Wikipedia's brand system, as the accent.
Blue #0000ff
shipped23 real palettes, including Monzo's brand system and Warp's brand system put Blue beside #181d2f, as the accent.
Real palettes that use #181d2f
Tints & shades
Harmonies
Contrast
| #181d2f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 16.72:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.26:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #181d2f as the background.
Brands using this color
Palettes built around it
Arctic
Open in tool →Navy type on white with an ice-blue accent: crisp and corporate without going grey.
Pastel Pop
Open in tool →Pastels pushed to the saturated end — pink, sky and lemon — for brands that want soft AND loud.
Fonts for this mood
#181d2f reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #181d2f
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #181d2f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/181d2f-9ca0c4-df7a4e-221f2d-e9eff1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md