Color

#5155c8

#5155c8
hex#5155c8
rgbrgb(81, 85, 200)
hslhsl(238, 52%, 55%)
oklchoklch(0.512 0.175 276.8)
Closest name: slateblue (#6a5acd)Relative luminance 0.1242

Colors that go with #5155c8

Charcoal, Sea Green and Amber 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 →

#c8c451

#5190c8 · #8851c8

#c85155 · #55c851

Split-complementary

Open in tool →

#c88851 · #90c851

#c85190 · #c8c451 · #51c888

Contrast

#5155c8 as textRatioAAAA largeAAAFix
Aaon white
6.03:1passpassfail
  • AAA: use #4145c3 as the text (7.33:1)
Aaon black
3.48:1failpassfail
  • AA: use #686bcf as the text (4.59:1)
  • AAA: use #8f91dc as the text (7.25:1)
  • AA: or shift the background to #e0e0e0 (4.57:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #5155c8 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

#5155c8 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #5155c8
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 #5155c8 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/5155c8-9f9cc4-df944e-251f2d-e9edf1?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