Color

#3c5bb9

#3c5bb9
hex#3c5bb9
rgbrgb(60, 91, 185)
hslhsl(225, 51%, 48%)
oklchoklch(0.5 0.153 267)
Closest name: Blasphemous Blue (#3356aa)Relative luminance 0.1195

Colors that go with #3c5bb9

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 →

#b99a3c

#3c9ab9 · #5b3cb9

#b93c5b · #5bb93c

Split-complementary

Open in tool →

#b95b3c · #9ab93c

#b93c9a · #b99a3c · #3cb95b

Contrast

#3c5bb9 as textRatioAAAA largeAAAFix
Aaon white
6.2:1passpassfail
  • AAA: use #3652a6 as the text (7.21:1)
Aaon black
3.39:1failpassfail
  • AA: use #5672c8 as the text (4.64:1)
  • AAA: use #8095d6 as the text (7.19:1)
  • AA: or shift the background to #dedede (4.61:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3c5bb9 as the background.

Brands using this color

Fonts for this mood

#3c5bb9 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3c5bb9
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 #3c5bb9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3c5bb9-9ca1c4-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