#643bb0 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	7.52:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.79:1	fail	fail	fail	AA: use #8762cb as the text (4.64:1) AAA: use #a488d7 as the text (7.08:1) AA: or shift the background to #c9c9c9 (4.54:1) AAA: or shift the background to #f7f7f7 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #643bb0 as the background.

Brands using this color

Fonts for this mood

#643bb0 reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around #643bb0

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 #643bb0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/643bb0-af9cc4-dfcb4e-2a1f2d-e9eaf1?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