Color

#666bea

#666bea
hex#666bea
rgbrgb(102, 107, 234)
hslhsl(238, 76%, 66%)
oklchoklch(0.591 0.188 277.3)
Closest name: mediumslateblue (#7b68ee)Relative luminance 0.1928

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#eae666

#66adea · #a466ea

#ea666b · #6bea66

Split-complementary

Open in tool →

#eaa466 · #adea66

#ea66ad · #eae666 · #66eaa4

Contrast

#666bea as textRatioAAAA largeAAAFix
Aaon white
4.32:1failpassfail
  • AA: use #6266ea as the text (4.56:1)
  • AAA: use #353be3 as the text (7.28:1)
  • AA: or shift the background to #0a0a0a (4.58:1)
Aaon black
4.86:1passpassfail
  • AAA: use #8a8eef as the text (7.2:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #666bea 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

#666bea reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #666bea
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #666bea and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/666bea-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