Color

#516e8a

#516e8a
hex#516e8a
rgbrgb(81, 110, 138)
hslhsl(209, 26%, 43%)
oklchoklch(0.527 0.056 248)
Closest name: Harbour Blue (#417491)Relative luminance 0.1474

Colors that go with #516e8a

Charcoal, Champagne and Copper 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.

Real palettes that use #516e8a

Tints & shades

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

Harmonies

Complementary

Open in tool →

#8a6d51

#518a89 · #51528a

#8a516f · #6f8a51

Split-complementary

Open in tool →

#8a5152 · #8a8951

#89518a · #8a6d51 · #528a51

Contrast

#516e8a as textRatioAAAA largeAAAFix
Aaon white
5.32:1passpassfail
  • AAA: use #425a70 as the text (7.17:1)
Aaon black
3.95:1failpassfail
  • AA: use #597997 as the text (4.61:1)
  • AAA: use #7e9ab4 as the text (7.17:1)
  • AA: or shift the background to #ededed (4.54:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #516e8a as the background.

Brands using this color

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

mcpConnect your agent — build around #516e8a
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 #516e8a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/516e8a-9cacc4-df4e4e-1f212d-e9f1f1?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