#663cb9 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	7.21:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.91:1	fail	fail	fail	AA: use #8561cc as the text (4.58:1) AAA: use #a388d8 as the text (7.07:1) AA: or shift the background to #cfcfcf (4.63:1) AAA: or shift the background to #fcfcfc (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #663cb9 as the background.

Brands using this color

Fonts for this mood

#663cb9 reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around #663cb9

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 #663cb9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/663cb9-ae9cc4-dfc94e-2a1f2d-e9ebf1?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