Color

#3539ac

#3539ac
hex#3539ac
rgbrgb(53, 57, 172)
hslhsl(238, 53%, 44%)
oklchoklch(0.42 0.179 274.1)
Closest name: Bluebell (#333399)Relative luminance 0.0666

Colors that go with #3539ac

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 →

#aca835

#3574ac · #6c35ac

#ac3539 · #39ac35

Split-complementary

Open in tool →

#ac6c35 · #74ac35

#ac3574 · #aca835 · #35ac6c

Contrast

#3539ac as textRatioAAAA largeAAAFix
Aaon white
9:1passpasspassPasses AAA — no fix needed.
Aaon black
2.33:1failfailfail
  • AA: use #676ad0 as the text (4.55:1)
  • AAA: use #8e90dc as the text (7.17:1)
  • AA: or shift the background to #b8b8b8 (4.54:1)
  • AAA: or shift the background to #e3e3e3 (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3539ac 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

#3539ac reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3539ac
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 #3539ac and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3539ac-9f9cc4-df944e-251f2d-e9edf1?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