Color

#183d43

#183d43
hex#183d43
rgbrgb(24, 61, 67)
hslhsl(188, 47%, 18%)
oklchoklch(0.336 0.043 209.5)
Closest name: Sunken Harbour (#1c3d44)Relative luminance 0.0394

Tints & shades

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

Harmonies

Complementary

Open in tool →

#431e18

#184334 · #182843

#43183e · #3e4318

Split-complementary

Open in tool →

#431828 · #433418

#341843 · #431e18 · #284318

Contrast

#183d43 as textRatioAAAA largeAAAFix
Aaon white
11.75:1passpasspassPasses AAA — no fix needed.
Aaon black
1.79:1failfailfail
  • AA: use #327f8b as the text (4.54:1)
  • AAA: use #41a5b4 as the text (7.27:1)
  • AA: or shift the background to #a1a1a1 (4.55:1)
  • AAA: or shift the background to #c9c9c9 (7.1:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183d43 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#183d43 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183d43
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

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

analyze #183d43 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183d43-a2b7be-df4e81-1f252d-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