Color

#331f41

#331f41
hex#331f41
rgbrgb(51, 31, 65)
hslhsl(275, 35%, 19%)
oklchoklch(0.282 0.065 309.9)
Closest name: Midnight Velvet (#2a2243)Relative luminance 0.0207

Colors that go with #331f41

Charcoal, Dark Olive Green and Sienna 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 →

#2e411f

#221f41 · #411f3f

#41331f · #1f4133

Split-complementary

Open in tool →

#3f411f · #1f4122

#41221f · #2e411f · #1f3f41

Contrast

#331f41 as textRatioAAAA largeAAAFix
Aaon white
14.86:1passpasspassPasses AAA — no fix needed.
Aaon black
1.41:1failfailfail
  • AA: use #9161b3 as the text (4.56:1)
  • AAA: use #ab87c5 as the text (7:1)
  • AA: or shift the background to #8f8f8f (4.6:1)
  • AAA: or shift the background to #b3b3b3 (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #331f41 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#331f41 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #331f41
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 #331f41 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/331f41-b89cc4-c0cb62-2d1f2d-eae9f1?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