Color

#5118fb

#5118fb
hex#5118fb
rgbrgb(81, 24, 251)
hslhsl(255, 97%, 54%)
oklchoklch(0.489 0.287 278.7)
Closest name: Blustering Blue (#4411ff)Relative luminance 0.0937

Colors that go with #5118fb

Charcoal, Cobalt Blue 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 →

#c3fb18

#1851fb · #c318fb

#fb5118 · #18fb51

Split-complementary

Open in tool →

#fbc318 · #51fb18

#fb1851 · #c3fb18 · #18fbc3

Contrast

#5118fb as textRatioAAAA largeAAAFix
Aaon white
7.31:1passpasspassPasses AAA — no fix needed.
Aaon black
2.87:1failfailfail
  • AA: use #7e54fc as the text (4.56:1)
  • AAA: use #a081fd as the text (7.05:1)
  • AA: or shift the background to #cccccc (4.55:1)
  • AAA: or shift the background to #fafafa (7:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5118fb 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

#5118fb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5118fb
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 #5118fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5118fb-ab9cc4-dfbd4e-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