Color

#51699a

#51699a
hex#51699a
rgbrgb(81, 105, 154)
hslhsl(220, 31%, 46%)
oklchoklch(0.523 0.083 263.8)
Closest name: Bellflower (#5d66aa)Relative luminance 0.1419

Colors that go with #51699a

Charcoal, Sea Green and Dark Olive Green 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 →

#9a8151

#518e9a · #5d519a

#9a5169 · #699a51

Split-complementary

Open in tool →

#9a5d51 · #8e9a51

#9a518e · #9a8151 · #519a5d

Contrast

#51699a as textRatioAAAA largeAAAFix
Aaon white
5.47:1passpassfail
  • AAA: use #43577f as the text (7.22:1)
Aaon black
3.84:1failpassfail
  • AA: use #5b75a9 as the text (4.56:1)
  • AAA: use #8397be as the text (7.14:1)
  • AA: or shift the background to #ebebeb (4.59:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #51699a 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 #51699a
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 #51699a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/51699a-9ca5c4-df694e-211f2d-e9f0f1?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