Color

#3f6897

#3f6897
hex#3f6897
rgbrgb(63, 104, 151)
hslhsl(212, 41%, 42%)
oklchoklch(0.509 0.088 252.9)
Closest name: Chill of the Night (#256d8d)Relative luminance 0.1319

Colors that go with #3f6897

Charcoal, Sea Green and Sienna 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 →

#976e3f

#3f9497 · #423f97

#973f68 · #68973f

Split-complementary

Open in tool →

#97423f · #94973f

#973f94 · #976e3f · #3f9742

Contrast

#3f6897 as textRatioAAAA largeAAAFix
Aaon white
5.77:1passpassfail
  • AAA: use #365981 as the text (7.23:1)
Aaon black
3.64:1failpassfail
  • AA: use #4877ad as the text (4.52:1)
  • AAA: use #7399c4 as the text (7.08:1)
  • AA: or shift the background to #e6e6e6 (4.62:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f6897 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#3f6897 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3f6897
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 #3f6897 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3f6897-9caac4-df564e-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