Color

#42678f

#42678f
hex#42678f
rgbrgb(66, 103, 143)
hslhsl(211, 37%, 41%)
oklchoklch(0.504 0.077 251.4)
Closest name: Admiral Blue (#50647f)Relative luminance 0.1284

Colors that go with #42678f

Charcoal, Sienna 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 →

#8f6a42

#428e8f · #43428f

#8f4267 · #678f42

Split-complementary

Open in tool →

#8f4342 · #8e8f42

#8f428e · #8f6a42 · #428f43

Contrast

#42678f as textRatioAAAA largeAAAFix
Aaon white
5.89:1passpassfail
  • AAA: use #3a5b7e as the text (7.05:1)
Aaon black
3.57:1failpassfail
  • AA: use #4d79a8 as the text (4.62:1)
  • AAA: use #779ac0 as the text (7.17:1)
  • AA: or shift the background to #e3e3e3 (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 #42678f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#42678f reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #42678f
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 #42678f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/42678f-9cabc4-df534e-1f202d-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