Color

#6563cf

#6563cf
hex#6563cf
rgbrgb(101, 99, 207)
hslhsl(241, 53%, 60%)
oklchoklch(0.557 0.162 280.6)
Closest name: slateblue (#6a5acd)Relative luminance 0.162

Colors that go with #6563cf

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 →

#cdcf63

#6397cf · #9b63cf

#cf6563 · #63cf65

Split-complementary

Open in tool →

#cf9b63 · #97cf63

#cf6397 · #cdcf63 · #63cf9b

Contrast

#6563cf as textRatioAAAA largeAAAFix
Aaon white
4.95:1passpassfail
  • AAA: use #4644c5 as the text (7.26:1)
Aaon black
4.24:1failpassfail
  • AA: use #6c6bd1 as the text (4.66:1)
  • AAA: use #8f8edc as the text (7.07:1)
  • AA: or shift the background to #f5f5f5 (4.54:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #6563cf as the background.

Brands using this color

Fonts for this mood

#6563cf reads as cool, modern. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #6563cf
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 #6563cf and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/6563cf-a19cc4-df9b4e-261f2d-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