Color

#66a8ea

#66a8ea
hex#66a8ea
rgbrgb(102, 168, 234)
hslhsl(210, 76%, 66%)
oklchoklch(0.715 0.118 249.8)
Closest name: Cerulean (#55aaee)Relative luminance 0.3677

Tints & shades

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

Harmonies

Complementary

Open in tool →

#eaa866

#66eaea · #6666ea

#ea66a8 · #a8ea66

Split-complementary

Open in tool →

#ea6666 · #eaea66

#ea66ea · #eaa866 · #66ea66

Contrast

#66a8ea as textRatioAAAA largeAAAFix
Aaon white
2.51:1failfailfail
  • AA: use #1c75ce as the text (4.68:1)
  • AAA: use #15599d as the text (7.12:1)
  • AA: or shift the background to #383838 (4.66:1)
  • AAA: or shift the background to #171717 (7.13:1)
Aaon black
8.35:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #66a8ea 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

#66a8ea reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #66a8ea
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 #66a8ea and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/66a8ea-9cabc4-df514e-1f202d-e9f1f1?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