Color

#183d4e

#183d4e
hex#183d4e
rgbrgb(24, 61, 78)
hslhsl(199, 53%, 20%)
oklchoklch(0.341 0.051 230.8)
Closest name: Cold and Dark (#154250)Relative luminance 0.0408

Tints & shades

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

Harmonies

Complementary

Open in tool →

#4e2918

#184e44 · #18224e

#4e183d · #3d4e18

Split-complementary

Open in tool →

#4e1822 · #4e4418

#44184e · #4e2918 · #224e18

Contrast

#183d4e as textRatioAAAA largeAAAFix
Aaon white
11.56:1passpasspassPasses AAA — no fix needed.
Aaon black
1.82:1failfailfail
  • AA: use #317da0 as the text (4.57:1)
  • AAA: use #4ca0c8 as the text (7.17:1)
  • AA: or shift the background to #a3a3a3 (4.58:1)
  • AAA: or shift the background to #cccccc (7.2:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183d4e 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

#183d4e reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183d4e
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 #183d4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183d4e-9cb3c4-df4e66-1f232d-e9f1f0?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