Color

#3141aa

#3141aa
hex#3141aa
rgbrgb(49, 65, 170)
hslhsl(232, 55%, 43%)
oklchoklch(0.43 0.168 270.9)
Closest name: Cobalt Blue (#0047ab)Relative luminance 0.0734

Colors that go with #3141aa

Charcoal, Sea Green and Steel Blue 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 →

#aa9a31

#317eaa · #5e31aa

#aa3141 · #41aa31

Split-complementary

Open in tool →

#aa5e31 · #7eaa31

#aa317e · #aa9a31 · #31aa5e

Contrast

#3141aa as textRatioAAAA largeAAAFix
Aaon white
8.51:1passpasspassPasses AAA — no fix needed.
Aaon black
2.47:1failfailfail
  • AA: use #5d6cd0 as the text (4.52:1)
  • AAA: use #8894dd as the text (7.33:1)
  • AA: or shift the background to #bdbdbd (4.53:1)
  • AAA: or shift the background to #ebebeb (7.14:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3141aa as the background.

Brands using this color

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

Fonts for this mood

#3141aa reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3141aa
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 #3141aa and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3141aa-9c9dc4-df864e-231f2d-e9eef1?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