Color

#183d72

#183d72
hex#183d72
rgbrgb(24, 61, 114)
hslhsl(215, 65%, 27%)
oklchoklch(0.364 0.101 257.9)
Closest name: Aegean Blue (#1b416f)Relative luminance 0.0475

Tints & shades

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

Harmonies

Complementary

Open in tool →

#724c18

#186a72 · #201872

#72183d · #3d7218

Split-complementary

Open in tool →

#722018 · #6a7218

#72186a · #724c18 · #187220

Contrast

#183d72 as textRatioAAAA largeAAAFix
Aaon white
10.77:1passpasspassPasses AAA — no fix needed.
Aaon black
1.95:1failfailfail
  • AA: use #3175d3 as the text (4.62:1)
  • AAA: use #6899df as the text (7.21:1)
  • AA: or shift the background to #a8a8a8 (4.53:1)
  • AAA: or shift the background to #d1d1d1 (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #183d72 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

#183d72 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #183d72
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 #183d72 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/183d72-9ca8c4-df5d4e-201f2d-e9f0f1?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