Color

#331f42

#331f42
hex#331f42
rgbrgb(51, 31, 66)
hslhsl(274, 36%, 19%)
oklchoklch(0.282 0.067 309.1)
Closest name: Midnight Velvet (#2a2243)Relative luminance 0.0208

Tints & shades

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

Harmonies

Complementary

Open in tool →

#2e421f

#211f42 · #421f40

#42331f · #1f4233

Split-complementary

Open in tool →

#40421f · #1f4221

#42211f · #2e421f · #1f4042

Contrast

#331f42 as textRatioAAAA largeAAAFix
Aaon white
14.84:1passpasspassPasses AAA — no fix needed.
Aaon black
1.42:1failfailfail
  • AA: use #9263b6 as the text (4.68:1)
  • AAA: use #ac89c8 as the text (7.17:1)
  • AA: or shift the background to #8f8f8f (4.59:1)
  • AAA: or shift the background to #b3b3b3 (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #331f42 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#331f42 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #331f42
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 #331f42 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/331f42-b79cc4-c2cb62-2d1f2d-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