Color

#431bc5

#431bc5
hex#431bc5
rgbrgb(67, 27, 197)
hslhsl(254, 76%, 44%)
oklchoklch(0.419 0.233 280.3)
Closest name: Galactic Highway (#3311bb)Relative luminance 0.0601

Colors that go with #431bc5

Charcoal, Denim and Cornflower Blue 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 →

#9ec51b

#1b48c5 · #981bc5

#c5431b · #1bc543

Split-complementary

Open in tool →

#c5981b · #48c51b

#c51b48 · #9ec51b · #1bc598

Contrast

#431bc5 as textRatioAAAA largeAAAFix
Aaon white
9.54:1passpasspassPasses AAA — no fix needed.
Aaon black
2.2:1failfailfail
  • AA: use #7e5de9 as the text (4.63:1)
  • AAA: use #9e86ee as the text (7.1:1)
  • AA: or shift the background to #b3b3b3 (4.55:1)
  • AAA: or shift the background to #dedede (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 #431bc5 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

#431bc5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #431bc5
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 #431bc5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/431bc5-aa9cc4-dfbb4e-291f2d-e9ebf1?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