Color

#558991

#558991
hex#558991
rgbrgb(85, 137, 145)
hslhsl(188, 26%, 45%)
oklchoklch(0.597 0.057 208.1)
Closest name: Arctic (#648589)Relative luminance 0.2187

Colors that go with #558991

Charcoal, Copper and Champagne 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 →

#915d55

#55917b · #556b91

#915589 · #899155

Split-complementary

Open in tool →

#91556b · #917b55

#7b5591 · #915d55 · #6b9155

Contrast

#558991 as textRatioAAAA largeAAAFix
Aaon white
3.91:1failpassfail
  • AA: use #4d7c84 as the text (4.63:1)
  • AAA: use #3a5e64 as the text (7.08:1)
  • AA: or shift the background to #171717 (4.59:1)
Aaon black
5.37:1passpassfail
  • AAA: use #689ea6 as the text (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #558991 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Palettes built around it

mcpConnect your agent — build around #558991
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 #558991 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/558991-a2b7be-df4e81-1f252d-e9f1ee?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