Color

#3d5ab3

#3d5ab3
hex#3d5ab3
rgbrgb(61, 90, 179)
hslhsl(225, 49%, 47%)
oklchoklch(0.494 0.145 267.3)
Closest name: Blasphemous Blue (#3356aa)Relative luminance 0.1156

Colors that go with #3d5ab3

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 →

#b3953d

#3d95b3 · #5a3db3

#b33d5a · #5ab33d

Split-complementary

Open in tool →

#b35a3d · #95b33d

#b33d95 · #b3953d · #3db35a

Contrast

#3d5ab3 as textRatioAAAA largeAAAFix
Aaon white
6.34:1passpassfail
  • AAA: use #3853a3 as the text (7.16:1)
Aaon black
3.31:1failpassfail
  • AA: use #5873c6 as the text (4.68:1)
  • AAA: use #7e93d3 as the text (7:1)
  • AA: or shift the background to #dbdbdb (4.58:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3d5ab3 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

#3d5ab3 reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3d5ab3
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 #3d5ab3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3d5ab3-9ca1c4-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