Color

#278ea5

#278ea5
hex#278ea5
rgbrgb(39, 142, 165)
hslhsl(191, 62%, 40%)
oklchoklch(0.6 0.096 216.5)
Closest name: Blue Moon (#3992a8)Relative luminance 0.2249

Colors that go with #278ea5

Charcoal, Copper and Crimson 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 →

#a53e27

#27a57d · #274fa5

#a5278e · #8ea527

Split-complementary

Open in tool →

#a5274f · #a57d27

#7d27a5 · #a53e27 · #4fa527

Contrast

#278ea5 as textRatioAAAA largeAAAFix
Aaon white
3.82:1failpassfail
  • AA: use #238095 as the text (4.57:1)
  • AAA: use #1a6070 as the text (7.12:1)
  • AA: or shift the background to #1a1a1a (4.56:1)
Aaon black
5.5:1passpassfail
  • AAA: use #2da3be as the text (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #278ea5 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

Fonts for this mood

#278ea5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #278ea5
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 #278ea5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/278ea5-a2b6be-df4e7a-1f252d-e9f1ef?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