Color

#183d3e

#183d3e
hex#183d3e
rgbrgb(24, 61, 62)
hslhsl(182, 44%, 17%)
oklchoklch(0.334 0.042 197.7)
Closest name: Sunken Harbour (#1c3d44)Relative luminance 0.0388

Colors that go with #183d3e

Crimson, Sienna and Teal 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.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#3e1a18

#183e2d · #182a3e

#3e183d · #3d3e18

Split-complementary

Open in tool →

#3e182a · #3e2d18

#2d183e · #3e1a18 · #2a3e18

Contrast

#183d3e as textRatioAAAA largeAAAFix
Aaon white
11.83:1passpasspassPasses AAA — no fix needed.
Aaon black
1.78:1failfailfail
  • AA: use #338184 as the text (4.61:1)
  • AAA: use #42a5a9 as the text (7.19:1)
  • AA: or shift the background to #a1a1a1 (4.58:1)
  • AAA: or shift the background to #c9c9c9 (7.14:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183d3e as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#183d3e reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183d3e
live endpoint

Point 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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #183d3e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183d3e-a2babe-d45990-1f272d-e9f1ee?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md