Color

#331d4e

#331d4e
hex#331d4e
rgbrgb(51, 29, 78)
hslhsl(267, 46%, 21%)
oklchoklch(0.287 0.088 301.8)
Closest name: Fabric of Space (#341758)Relative luminance 0.0213

Colors that go with #331d4e

Charcoal, Dark Olive Green and Sea Green 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 →

#384e1d

#1d1f4e · #4c1d4e

#4e331d · #1d4e33

Split-complementary

Open in tool →

#4e4c1d · #1f4e1d

#4e1d1f · #384e1d · #1d4e4c

Contrast

#331d4e as textRatioAAAA largeAAAFix
Aaon white
14.72:1passpasspassPasses AAA — no fix needed.
Aaon black
1.43:1failfailfail
  • AA: use #8c5fc4 as the text (4.55:1)
  • AAA: use #aa88d3 as the text (7.17:1)
  • AA: or shift the background to #8f8f8f (4.55:1)
  • AAA: or shift the background to #b3b3b3 (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #331d4e as the background.

Brands using this color

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

Palettes built around it

Fonts for this mood

#331d4e reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #331d4e
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 #331d4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/331d4e-b39cc4-dfda4e-2c1f2d-e9eaf1?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