Color

#183f2f

#183f2f
hex#183f2f
rgbrgb(24, 63, 47)
hslhsl(155, 45%, 17%)
oklchoklch(0.334 0.053 164)
Closest name: Botanical Night (#12403c)Relative luminance 0.0395

Colors that go with #183f2f

Crimson, Sea Green 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.

Real palettes that use #183f2f

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3f1828

#183f1b · #183c3f

#2f183f · #3f2f18

Split-complementary

Open in tool →

#3f183c · #3f1b18

#1b183f · #3f1828 · #3c3f18

Contrast

#183f2f as textRatioAAAA largeAAAFix
Aaon white
11.73:1passpasspassPasses AAA — no fix needed.
Aaon black
1.79:1failfailfail
  • AA: use #328563 as the text (4.67:1)
  • AAA: use #41aa7e as the text (7.28:1)
  • AA: or shift the background to #a1a1a1 (4.54:1)
  • AAA: or shift the background to #c9c9c9 (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183f2f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#183f2f reads as dark, luxury, bold. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183f2f
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 #183f2f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183f2f-a2beb6-d459c8-1f2d2d-e9f1ea?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