#666cdb as text	Ratio	AA	AA large	AAA	Fix
Aaon white	4.44:1	fail	pass	fail	AA: use #6268da as the text (4.65:1) AAA: use #3d44d1 as the text (7.13:1) AA: or shift the background to #080808 (4.51:1)
Aaon black	4.73:1	pass	pass	fail	AAA: use #8b90e4 as the text (7.21:1)

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

Brands using this color

Linearprimary · #5e6ad2 · Δ1.849

Fonts for this mood

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

Technical fonts →Modern fonts →

mcpConnect your agent — build around #666cdb

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

tool url/palettes/new/666cdb-9f9cc4-df924e-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