Color

#3741c8

#3741c8
hex#3741c8
rgbrgb(55, 65, 200)
hslhsl(236, 57%, 50%)
oklchoklch(0.461 0.205 271.9)
Closest name: Blurple (#5539cc)Relative luminance 0.0876

Colors that go with #3741c8

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 →

#c8be37

#3789c8 · #7637c8

#c83741 · #41c837

Split-complementary

Open in tool →

#c87637 · #89c837

#c83789 · #c8be37 · #37c876

Contrast

#3741c8 as textRatioAAAA largeAAAFix
Aaon white
7.63:1passpasspassPasses AAA — no fix needed.
Aaon black
2.75:1failfailfail
  • AA: use #636ad4 as the text (4.54:1)
  • AAA: use #8b91df as the text (7.21:1)
  • AA: or shift the background to #c7c7c7 (4.51:1)
  • AAA: or shift the background to #f7f7f7 (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3741c8 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

#3741c8 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3741c8
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 #3741c8 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3741c8-9e9cc4-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