Color

#3759be

#3759be
hex#3759be
rgbrgb(55, 89, 190)
hslhsl(225, 55%, 48%)
oklchoklch(0.497 0.164 266.4)
Closest name: Denim (#1560bd)Relative luminance 0.1167

Colors that go with #3759be

Charcoal, Sea Green and Amber 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 →

#be9c37

#379cbe · #5937be

#be3759 · #59be37

Split-complementary

Open in tool →

#be5937 · #9cbe37

#be379c · #be9c37 · #37be59

Contrast

#3759be as textRatioAAAA largeAAAFix
Aaon white
6.3:1passpassfail
  • AAA: use #3251ae as the text (7.18:1)
Aaon black
3.33:1failpassfail
  • AA: use #5170cd as the text (4.55:1)
  • AAA: use #7d94d9 as the text (7.11:1)
  • AA: or shift the background to #dbdbdb (4.55:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3759be as the background.

Brands using this color

Fonts for this mood

#3759be reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3759be
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 #3759be and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3759be-9ca1c4-df754e-221f2d-e9eff1?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