Color

#3841b7

#3841b7
hex#3841b7
rgbrgb(56, 65, 183)
hslhsl(236, 53%, 47%)
oklchoklch(0.446 0.183 273)
Closest name: Cobalt Blue (#0047ab)Relative luminance 0.0804

Colors that go with #3841b7

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 →

#b7af38

#3880b7 · #6f38b7

#b73841 · #41b738

Split-complementary

Open in tool →

#b76f38 · #80b738

#b73880 · #b7af38 · #38b76f

Contrast

#3841b7 as textRatioAAAA largeAAAFix
Aaon white
8.05:1passpasspassPasses AAA — no fix needed.
Aaon black
2.61:1failfailfail
  • AA: use #676ed0 as the text (4.72:1)
  • AAA: use #8a8fdb as the text (7.03:1)
  • AA: or shift the background to #c2c2c2 (4.52:1)
  • AAA: or shift the background to #f0f0f0 (7.07:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3841b7 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

#3841b7 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3841b7
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 #3841b7 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3841b7-9e9cc4-df8f4e-241f2d-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